2020-10-20T23:42:18Zhttp://edoc.mpg.de/ac_p_oai.ploai:edoc.mpg.de:201832014-10-1343:960
Article
The asymptotic region of the potential energy surfaces relevant for the O(<sup>3</sup>P)+O<sub>2</sub>(X<sup>3</sup>Σ<sub>g</sub><sup>-</sup>) ⇋ O<sub>3</sub> reaction
English
2002-09-08
4871
4877
Journal of Chemical Physics
J. Chem. Phys.
10
117
The potential energy functions for all states of ozone correlating with the lowest O(P-3)+O-2(X (3)Sigma(g)(-)) asymptote have been calculated in the asymptotic region employing correlated electronic wave functions. For linear ozone, the (s)Sigma states (s=1,3, and 5) lie above the corresponding (s)Pi states. For bent geometries the Pi states split into Renner-Teller components with A(') and A(') symmetry, respectively. While the (1)Pi and (3)Pi states lead to bent-bent Renner-Teller pairs, the (5)Pi state gives rise to a linear/linear pair of states. The different spin multiplets emerging from the Pi states cross for valence angles around 160degrees and the (1)A(') component becomes the lowest one. The matrix elements of the spin-orbit operator have also been calculated. They are dominated by the atomic P-3 contributions and their dependence on the mutual orientation of the O-2 molecule and the O atom is small. In the regions where the states correlating to the linear (1,3,5)Pi cross, i.e., for valence angles between 150degrees and 180degrees and close to 90degrees, the mixing among the singlet, triplet, and quintet states is strong and the electron spin quantum number is no longer a good quantum number. (C) 2002 American Institute of Physics.
notspecified
published
joureview
P.
Rosmus
P.
P.
Palmieri
P.
R.
Schinke
R.
000177574400032
0021-9606
MPI für Dynamik und Selbstorganisation
2003
2014-10-13 16:20:51.421662
oai:edoc.mpg.de:201852014-10-1343:960
Article
Resonances in S<sub>N</sub>2 reactions: Two-mode quantum calculations for Cl⁻+CH<sub>3</sub>Br on a coupled-cluster potential energy surface
English
2002-12-01
9710
9718
Journal of Chemical Physics
J. Chem. Phys.
21
117
An effective two-dimensional potential energy surface has been constructed for the S<sub>N</sub>2 reaction Cl<sup>-</sup>+CH<sub>3</sub>Br-->ClCH<sub>3</sub>+Br<sup>-</sup> from coupled-cluster calculations with a large basis set. In the quantum dynamics calculations Radau coordinates were employed to describe the Cl-C and C-Br stretching modes. Making use of the filter diagonalization method and an optical potential, bound states as well as resonance states up to energies far above the dissociation threshold have been calculated. The resonance widths fluctuate over several orders of magnitude. In addition to a majority of Feshbach-type resonances there are also exceedingly long-lived shape resonances, which can only decay by tunneling. Owing to a smaller width of the potential barrier and a larger density of states, tunneling through the barrier is more important for Cl<sup>-</sup>+CH<sub>3</sub>Br than for Cl<sup>-</sup>+CH<sub>3</sub>Cl despite the larger total mass of this system. Excitation of the C-Br stretching vibration enhances the tunneling probability of the entrance channel complex. (C) 2002 American Institute of Physics.
notspecified
published
joureview
S.
Schmatz
S.
P.
Botschwina
P.
J.
Hauschildt
J.
R.
Schinke
R.
000179205700025
0021-9606
MPI für Dynamik und Selbstorganisation
2003
2014-10-13 16:18:42.498036
oai:edoc.mpg.de:201862014-10-1343:960
Article
Relationship between mode specific and thermal unimolecular rate constants for HOCl -> OH+Cl dissociation
English
2002-09-12
8339
8344
Journal of Physical Chemistry A
J. Phys. Chem. A
36
106
Recent quantum dynamical calculations [Hauschildt, J.; et al. Chem. Phys.. Lett. 1999, 300, 569] have shown that HOCl --> OH + Cl dissociation on the ground-state potential energy surface, and for J = 0, occurs predominantly via isolated compound-state resonances, whose rates are highly mode-specific. In this work, these resonance rates are averaged to calculate the HOCl --> OH + Cl unimolecular rate constant as a function of temperature and pressure. The result is compared with the standard pressure and temperature dependent RRKM unimolecular rate constant. It is found that the state-specificity makes the pressure- dependent rates significantly lower than the RRKM rates in the intermediate pressure regime.
notspecified
published
joureview
K. H.
Song
K. H.
L. P.
Sun
L. P.
W. L.
Hase
W. L.
S. Y.
Grebenshchikov
S. Y.
R.
Schinke
R.
000177876500016
1089-5639
MPI für Dynamik und Selbstorganisation
2003
2014-10-13 16:17:14.429917
oai:edoc.mpg.de:201912014-10-1343:960
Article
Highly excited motion in molecules: Saddle-node bifurcations and their fingerprints in vibrational spectra
English
2002-06-06
5407
5421
Journal of Physical Chemistry A
J. Phys. Chem. A
22
106
The vibrational motion of highly excited molecules is discussed in terms of exact quantum and classical mechanics calculations, employing global potential energy surfaces, as well as in terms of a spectroscopic Hamiltonian and its semiclassical limit. The main focus is saddle-node bifurcations and their influence on the spectrum. The general features are illustrated by three examples, which despite their quite different intramolecular motions have several aspects in common: HCP, HOCl, and HOBr. In all three cases a 1:2 Fermi resonance is the ultimate cause of the complications observed in the spectra.
notspecified
published
joureview
M.
Joyeux
M.
S. C.
Farantos
S. C.
R.
Schinke
R.
000176049600002
1089-5639
MPI für Dynamik und Selbstorganisation
2003
2014-10-13 16:17:43.819759
oai:edoc.mpg.de:208762014-10-1343:960
Article
The vibrational energies of ozone up to the dissociation threshold: Dynamics calculations on an accurate potential energy surface
English
2002-06-08
9749
9767
Journal of Chemical Physics
J. Chem. Phys.
22
116
We present an ab initio potential energy surface for the ground electronic state of ozone. It is global, i.e., it covers the three identical C<sub>2v</sub> (open) minima, the D<sub>3h</sub> (ring) minimum, as well as the O(<sup>3</sup>P)+O<sub>2</sub>(<sup>3</sup>Σ<sub>g</sub><sup>-</sup>) dissociation threshold. The electronic structure calculations are performed at the multireference configuration interaction level with complete active space self-consistent-field reference functions and correlation consistent polarized quadruple zeta atomic basis functions. Two of the O-O bond distances, R<sub>1</sub> and R<sub>2</sub>, and the O-O-O bending angle are varied on a regular grid (ca. 5000 points with R<sub>1</sub> ≥ R<sub>2</sub>). An analytical representation is obtained by a three-dimensional cubic spline. The calculated potential energy surface has a tiny dissociation barrier and a shallow van der Waals minimum in the exit channel. The ring minimum is separated from the three open minima by a high potential barrier and therefore presumably does not influence the low-temperature kinetics. The dissociation energy is reproduced up to 90% of the experimental value. All bound states of nonrotating ozone up to more than 99% of the dissociation energy are calculated using the filter diagonalization technique and employing Jacobi coordinates. The three lowest transition energies for <sup>16</sup>O<sub>3</sub> are 1101.9 cm<sup>-1</sup> (1103.14 cm<sup>-1</sup>), 698.5 cm<sup>-1</sup> (700.93 cm<sup>-1</sup>), and 1043.9 cm<sup>-1</sup> (1042.14 cm<sup>-1</sup>) for the symmetric stretch, the bending, and the antisymmetric stretch modes, respectively; the numbers in parentheses are the experimental values. The root-mean-square error for all measured transition energies for <sup>16</sup>O<sub>3</sub> is only 5 cm<sup>-1</sup>. The comparison is equally favorable for all other isotopomers, for which experimental frequencies are available. The assignment is made in terms of normal modes, despite the observation that with increasing energy an increasing number of states acquires local-mode character. At energies close to the threshold a large fraction of states is still unambiguously assignable, particularly those of the overtone progressions. This is in accord with the existence of stable classical periodic orbits up to very high energies. (C) 2002 American Institute of Physics.
notspecified
published
joureview
R.
Siebert
R.
P.
Fleurat-Lessard
P.
R.
Schinke
R.
M.
Bittererova
M.
S. C.
Farantos
S. C.
000175744600024
0021-9606
MPI für Dynamik und Selbstorganisation
2003
2014-10-13 16:16:16.175377
oai:edoc.mpg.de:1758762014-10-1443:960
Article
van der Waals states in ozone and their influence on the threshold spectrum of O<sub>3</sub>(X<sup>1</sup>A<sub>1</sub>). I. Bound states.
English
2003-10-01
6512
6523
Journal of Chemical Physics
J. Chem. Phys.
13
119
notspecified
published
notspecified
S. Y.
Grebenshchikov
S. Y.
R.
Schinke
R.
P.
Fleurat-Lessard
P.
M.
Joyeux
M.
000185421400016
0021-9606
MPI für Dynamik und Selbstorganisation
Nichtlineare Dynamik
2004
2014-10-14 09:38:08.699072
oai:edoc.mpg.de:1758782014-10-1443:960
Article
Comment on 'Rate coefficients for photoinitiated NO<sub>2</sub> unimolecular decomposition: energy dependence in the threshold regime' [Chem. Phys. Lett. 358 (2002) 71]
English
2003-01-14
252
256
Chemical Physics Letters
Chem. Phys. Lett.
1-2
368
notspecified
published
notspecified
B.
Abel
B.
S. Y.
Grebenshchikov
S. Y.
R.
Schinke
R.
D.
Schwarzer
D.
000180319900041
0009-2614
MPI für Dynamik und Selbstorganisation
Nichtlineare Dynamik
2004
2014-10-14 09:40:26.580815
oai:edoc.mpg.de:1759572014-10-1443:960
Article
Formation of ozone: Metastable states and anomalous isotope effect
English
2003-08-01
2577
2589
Journal of Chemical Physics
J. Chem. Phys.
5
119
notspecified
published
notspecified
D.
Babikov
D.
B. K.
Kendrick
B. K.
R. B.
Walker
R. B.
R. T.
Pack
R. T.
P.
Fleurat-Lesard
P.
R.
Schinke
R.
000184242100011
0021-9606
MPI für Dynamik und Selbstorganisation
Nichtlineare Dynamik
2004
2014-10-14 09:41:43.214161
oai:edoc.mpg.de:1759582014-10-1443:960
Article
Isotope dependence of the O+O<sub>2</sub> exchange reaction: Experiment and theory
English
2003-09-01
4700
4712
Journal of Chemical Physics
J. Chem. Phys.
9
119
notspecified
published
notspecified
P.
Fleurat-Lessard
P.
S. Y.
Grebenshchikov
S. Y.
R.
Schinke
R.
C.
Janssen
C.
D.
Krankowsky
D.
000184775200012
0021-9606
MPI für Dynamik und Selbstorganisation
Nichtlineare Dynamik
2004
2014-10-14 09:42:09.690314
oai:edoc.mpg.de:1759592014-10-1443:960
Article
Isotope dependence of the lifetime of ozone complexes formed in O+O<sub>2</sub> collisions
English
2003
1966
1969
Physical Chemistry Chemical Physics
Phys. Chem. Chem. Phys.
10
5
notspecified
published
notspecified
R.
Schinke
R.
P.
Fleurat-Lessard
P.
S. Y.
Grebenshchikov
S. Y.
000182602400002
1463-9076
MPI für Dynamik und Selbstorganisation
Nichtlineare Dynamik
2014-10-14 09:42:44.01395
oai:edoc.mpg.de:1759612014-10-1443:960
Article
Metastable states of ozone calculated on an accurate potential energy surface
English
2003-04-08
6298
6308
Journal of Chemical Physics
J. Chem. Phys.
14
118
notspecified
published
notspecified
D.
Babikov
D.
B. K.
Kendrick
B. K.
R. B.
Walker
R. B.
R. T.
Pack
R. T.
P.
Fleurat-Lesard
P.
R.
Schinke
R.
000181834900023
0021-9606
MPI für Dynamik und Selbstorganisation
Nichtlineare Dynamik
2004
2014-10-14 09:36:48.294823
oai:edoc.mpg.de:1759622014-10-1443:960
Article
NO<sub>2</sub>: Global potential energy surfaces of the ground (1<sup>2</sup>A<sub>1</sub>) and the first excited (1<sup>2</sup>B<sub>2</sub>) electronic states
English
2003-07-15
1489
1501
Journal of Chemical Physics
J. Chem. Phys.
3
119
notspecified
published
notspecified
V.
Kurkal
V.
P.
Fleurat-Lessard
P.
R.
Schinke
R.
000183915100024
0021-9606
MPI für Dynamik und Selbstorganisation
Nichtlineare Dynamik
2004
2014-10-14 09:43:38.003309
oai:edoc.mpg.de:1759912014-10-1443:960
Article
The bound state spectrum of HOBr up to the dissociation limit: Evolution of saddle-node bifurcations
English
2003-06-01
9643
9652
Journal of Chemical Physics
J. Chem. Phys.
21
118
notspecified
published
notspecified
T.
Azzam
T.
R.
Schinke
R.
S. C.
Farantos
S. C.
M.
Joyeux
M.
K. A.
Peterson
K. A.
000182890000023
0021-9606
MPI für Dynamik und Selbstorganisation
Nichtlineare Dynamik
2004
2014-10-14 09:50:29.593854
oai:edoc.mpg.de:1759922014-10-1443:960
Article
The effect of spin-orbit coupling in complex forming O(<sup>3</sup>P) + O<sub>2</sub> collisions
English
2003-11-15
10186
10193
Journal of Chemical Physics
J. Chem. Phys.
19
119
notspecified
published
notspecified
M.
Tashiro
M.
R.
Schinke
R.
000186273200024
0021-9606
MPI für Dynamik und Selbstorganisation
Nichtlineare Dynamik
2004
2014-10-14 09:50:55.736987
oai:edoc.mpg.de:1759962014-10-1443:960
Article
The ultra-violet photodissociation of ozone revisited
English
2003-08-15
359
366
Chemical Physics Letters
Chem. Phys. Lett.
3-4
377
notspecified
published
notspecified
Z. W.
Qu
Z. W.
H.
Zhu
H.
R.
Schinke
R.
000184895200016
0009-2614
MPI für Dynamik und Selbstorganisation
Nichtlineare Dynamik
2004
2014-10-14 09:52:00.000971
oai:edoc.mpg.de:1759972014-10-1443:960
Article
The vibrational spectrum of cyclic ozone
English
2003-08-08
3092
3097
Journal of Chemical Physics
J. Chem. Phys.
6
119
notspecified
published
notspecified
R.
Siebert
R.
R.
Schinke
R.
000184350300017
0021-9606
MPI für Dynamik und Selbstorganisation
Nichtlineare Dynamik
2004
2014-10-14 09:52:25.107205
oai:edoc.mpg.de:1759982014-10-1443:960
Article
Theoretical investigation of the temperature dependence of the O+O<sub>2</sub> exchange reaction
English
2003-01-08
610
621
Journal of Chemical Physics
J. Chem. Phys.
2
118
notspecified
published
notspecified
P.
Fleurat-Lessard
P.
S. Y.
Grebenshchikov
S. Y.
R.
Siebert
R.
R.
Schinke
R.
N.
Halberstadt
N.
000179949700017
0021-9606
MPI für Dynamik und Selbstorganisation
Nichtlineare Dynamik
2004
2014-10-14 09:49:37.91556
oai:edoc.mpg.de:1759992014-10-1443:960
Article
Theory of molecular bound states including Σ-Π vibronic interaction
English
2003-03-15
123
136
Chemical Physics
Chem. Phys.
2-3
288
notspecified
published
notspecified
L.
Poluyanov
L.
R.
Schinke
R.
000181550500004
0301-0104
MPI für Dynamik und Selbstorganisation
2004
2014-10-14 09:50:05.346164
oai:edoc.mpg.de:1760002014-10-1443:960
Article
Time-dependent wave packet study of the O+O<sub>2</sub> (υ=0,j=0) exchange reaction
English
2003-09-18
7215
7219
Journal of Physical Chemistry A
J. Phys. Chem. A
37
107
notspecified
published
notspecified
K. L.
Yeh
K. L.
D. Q.
Xie
D. Q.
D. H.
Zhang
D. H.
S. Y.
Lee
S. Y.
R.
Schinke
R.
000185344800022
1089-5639
MPI für Dynamik und Selbstorganisation
Nichtlineare Dynamik
2004
2014-10-14 09:52:55.758043
oai:edoc.mpg.de:1760012014-10-1443:960
Article
Two-dimensional neutral donors in electric fields
English
2003-09-01
5909
5913
Journal of Physics-Condensed Matter
J. Phys.-Condes. Matter
34
15
notspecified
published
notspecified
M. V.
Ivanov
M. V.
R.
Schinke
R.
000185728800024
0953-8984
MPI für Dynamik und Selbstorganisation
Nichtlineare Dynamik
2004
2014-10-14 09:53:22.726805
oai:edoc.mpg.de:1904552007-03-2843:960
Article
Quantum origin of an anomalous isotope effect in ozone formation
English
2003
686
691
Chemical Physics Letters
372
notspecified
published
notspecified
D.
Babikov
D.
B. K.
Kendrick
B. K.
R. B.
Walker
R. B.
R. T.
Pack
R. T.
R.
Schinke
R.
MPI für Strömungsforschung
Nichtlineare Dynamik
2004
2007-03-28 11:43:19.459056
oai:edoc.mpg.de:1904562007-03-2843:960
InBook
State-specific dynamics of unimolecular dissociation
English
Elsevier
Amsterdam
2003
105
242
Comprehensive Chemical Kinetics, Part 1
Green, N. J. B.
notspecified
published
notspecified
S.
Grebenshchikov
S.
R.
Schinke
R.
W. L.
Hase
W. L.
MPI für Strömungsforschung
Nichtlineare Dynamik
2004
2007-03-28 11:43:19.48618
oai:edoc.mpg.de:2196372007-03-2843:960
Article
Intra- and intermolecular energy transfer in highly excited ozone complexes
English
2004-06-01
10015
10024
Journal of Chemical Physics
J. Chem. Phys.
21
120
notspecified
published
joureview
M. V.
Ivanov
M. V.
S. Y.
Grebenshchikov
S. Y.
R.
Schinke
R.
000221404500017
0021-9606
MPI für Dynamik und Selbstorganisation
2005
2007-03-28 11:43:19.507051
oai:edoc.mpg.de:2196382007-03-2843:960
Article
Two-dimensional analogs of the H<sub>2</sub><sup>+</sup> ion in stationary electric fields
English
2004-04
165308
Physical Review B
Phys. Rev. B
16
69
notspecified
published
joureview
M. V.
Ivanov
M. V.
R.
Schinke
R.
000221427100059
1098-0121
Russian Acad Sci, Inst Precambrian Geol & Geochronol, St Petersburg 199034, Russia.
MPI für Dynamik und Selbstorganisation
2005
2007-03-28 11:43:19.533904
oai:edoc.mpg.de:2196402007-03-2843:960
Article
Resonance spectrum and dissociation dynamics of ozone in the <sup>3</sup>B<sub>2</sub> electronically excited state: Experiment and theory
English
2004-09-15
5191
5200
Journal of Chemical Physics
J. Chem. Phys.
11
121
notspecified
published
joureview
S. F.
Deppe
S. F.
U.
Wachsmuth
U.
B.
Abel
B.
M.
Bittererova
M.
S. Y.
Grebenshchikov
S. Y.
R.
Siebert
R.
R.
Schinke
R.
000223720600022
0021-9606
Slovak Univ Technol, Dept Chem Phys, SK-81237 Bratislava, Slovakia.; Univ Gottingen, Inst Phys Chem, D-37077 Gottingen, Germany.
MPI für Dynamik und Selbstorganisation
2005
2007-03-28 11:43:19.555446
oai:edoc.mpg.de:2196442007-03-2843:960
Article
On spin-forbidden processes in the ultra-violet photodissociation of ozone
English
2004-01-19
45
51
Chemical Physics Letters
Chem. Phys. Lett.
1-3
384
notspecified
published
joureview
H.
Zhu
H.
Z. W.
Qu
Z. W.
M.
Tashiro
M.
R.
Schinke
R.
000188294800010
0009-2614
MPI für Dynamik und Selbstorganisation
2005
2007-03-28 11:43:19.574013
oai:edoc.mpg.de:2196462007-03-2843:960
Article
Semiclassical dynamics of the van der Waals states in O<sub>3</sub>(X <sup>1</sup>A<sub>1</sub>)
English
2004-04-22
7426
7437
Journal of Chemical Physics
J. Chem. Phys.
16
120
notspecified
published
joureview
M.
Joyeux
M.
R.
Schinke
R.
S. Y.
Grebenshchikov
S. Y.
000220676000022
0021-9606
Univ Grenoble 1, Spectrometrie Phys Lab, CNRS, UMR 5588, F-38402 St Martin Dheres, France.
MPI für Dynamik und Selbstorganisation
2005
2007-03-28 11:43:19.599686
oai:edoc.mpg.de:2196472007-03-2843:960
Article
The Huggins band of ozone: A theoretical analysis
English
2004-12-15
11731
11745
Journal of Chemical Physics
J. Chem. Phys.
23
121
notspecified
published
joureview
Z. W.
Qu
Z. W.
H.
Zhu
H.
S. Y.
Grebenshchikov
S. Y.
R.
Schinke
R.
S. C.
Farantos
S. C.
000225440200024
0021-9606
Max Planck Inst Stromungsforsch, D-37073 Gottingen, Germany.; Fdn Res & Technol Hellas, Inst Elect Struct & Laser, GR-71110 Iraklion, Crete, Greece.; Univ Crete, Dept Chem, GR-71110 Iraklion, Crete, Greece.
MPI für Dynamik und Selbstorganisation
2005
2007-03-28 11:43:19.618782
oai:edoc.mpg.de:2196482007-03-2843:960
Article
The Huggins band of ozone: Unambiguous electronic and vibrational assignment
English
2004-04-15
6811
6814
Journal of Chemical Physics
J. Chem. Phys.
15
120
notspecified
published
joureview
Z. W.
Qu
Z. W.
H.
Zhu
H.
M.
Tashiro
M.
R.
Schinke
R.
S. C.
Farantos
S. C.
000220585300002
0021-9606
Max Planck Inst Stromungsforsch, D-37073 Gottingen, Germany.; Univ Crete, Inst Elect Struct & Laser, Fdn Res & Technol Hellas, GR-71110 Iraklion, Crete, Greece.; Univ Crete, Dept Chem, GR-71110 Iraklion, Crete, Greece.
MPI für Dynamik und Selbstorganisation
2005
2007-03-28 11:43:19.63753
oai:edoc.mpg.de:2198792007-03-2843:960
Article
On the transition-state region of the O(<sup>3</sup>P) + O<sub>2</sub>(<sup>3</sup>Σ<sub>g</sub><sup>-</sup>) potential energy surface
English
2004-09-22
5789
5793
Journal of Chemical Physics
121
notspecified
published
notspecified
R.
Schinke
Reinhard
P.
Fleurat-Lessard
Paul
MPI für Dynamik und Selbstorganisation
Nichtlineare Dynamik
2005
2007-03-28 11:43:19.654919
oai:edoc.mpg.de:2263092006-04-2043:960
Article
Defect turbulence and generalized statistical mechanics
English
2004
208
217
Physica D
193
expertsonly
published
notspecified
K. E.
Daniels
Karen E.
C.
Beck
Christian
E.
Bodenschatz
Eberhard
10.1016/j.physd.2004.01.033
Cornell University, Ithaca, NY, USA
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2005
2006-04-20 15:21:04.03842
oai:edoc.mpg.de:2263102006-04-2043:960
Article
Experimental Lagrangian acceleration probability density function measurement
English
2004
245
251
Physica D
193
expertsonly
published
notspecified
N.
Mordant
Nicolas
A. M.
Crawford
Alice M.
E.
Bodenschatz
Eberhard
10.1016/j.physd.2004.01.041
Cornell University, Ithaca, NY, USA
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2005
2006-04-20 15:20:38.548467
oai:edoc.mpg.de:2263112006-04-2043:960
Article
Dislocation dynamics in Rayleigh-Bénard convection
English
2004-09
933
939
Chaos
14
Theoretical results on the dynamics of dislocations in Rayleigh-Benard convection are reported both for a Swift-Hohenberg model and the Oberbeck-Boussinesq equations. For intermediate Prandtl numbers the motion of dislocations is found to be driven by the superposition of two independent contributions: (i) the Peach-Koehler force and (ii) an advection force on the dislocation core by its self-generated mean flow. Their competition allows to explain the experimentally observed bound dislocation pairs.
expertsonly
published
notspecified
T.
Walter
T.
E.
Bodenschatz
E.
W.
Pesch
W.
10.1063/1.1772231
Cornell University, Ithaca, NY, USA
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2005
2006-04-20 15:20:19.044591
oai:edoc.mpg.de:2263122006-04-2043:960
Article
Statistics of defect trajectories in spatio-temporal chaos in inclined layer convection and the complex Ginzburg-Landau equation
English
2004-09
864
874
Chaos
3
14
For spatio-temporal chaos observed in numerical simulations of the complex Ginzburg-Landau equation (CGL) and in experiments on inclined-layer convection (ILC) we report numerical and experimental data on the statistics of defects and of defect loops. These loops consist of defect trajectories in space-time that are connected to each other through the pairwise annihilation or creation of the associated defects. While most such loops are small and contain only a few defects, the loop distribution functions decay only slowly with the quantities associated with the loop size, consistent with power-law behavior. For the CGL, two of the three power-law exponents are found to agree, within our computational precision, with those from previous investigations of a simple lattice model. In certain parameter regimes of the CGL and ILC, our results for the single-defect statistics show significant deviations from the previously reported findings that the defect dynamics are consistent with those of random walkers that are created with fixed probability and annihilated through random collisions.
expertsonly
published
notspecified
C.
Huepe
Cristián
H.
Riecke
Hermann
K.
Daniels
Karen
E.
Bodenschatz
Eberhard
10.1063/1.1778495
Cornell University, Ithaca, NY, USA
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2005
2006-04-20 15:24:50.097224
oai:edoc.mpg.de:2263132006-04-2043:960
Article
A random synthetic jet array driven turbulence tank
English
2004-10
613
615
Experiments in Fluids
Exp. Fluids
4
37
expertsonly
published
notspecified
E. A.
Variano
Evan A.
E.
Bodenschatz
Eberhard
E. A.
Cowen
Edwin A.
0723-4864
10.1007/s00348-004-0833-z
Cornell University, Ithaca, NY, USA
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2005
2006-04-20 15:24:30.962246
oai:edoc.mpg.de:2263142006-04-2043:960
Article
Three-Dimensional Structure of Lagrangian Acceleration in Turbulent Flows
English
2004-11
214501-1
214501-4
Physical Review Letters
Phys. Rev. Lett.
21
93
We report experimental results on the three-dimensional Lagrangian acceleration in highly turbulent flows. Tracer particles are tracked optically using four silicon strip detectors from high energy physics that provide high temporal and spatial resolution. The components of the acceleration are shown to be statistically dependent. The probability density function of the acceleration magnitude is comparable to a log-normal distribution. Assuming isotropy, a log-normal distribution of the magnitude can account for the observed dependency of the components. The time dynamics of the acceleration components is found to be typical of the dissipation scales, whereas the magnitude evolves over longer times, possibly close to the integral time scale.
expertsonly
published
notspecified
N.
Mordant
Nicolas
A. M.
Crawford
Alice M.
E.
Bodenschatz
Eberhard
10.1103/PhysRevLett.93.214501
Cornell University, Ithaca, NY, USA
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2005
2006-04-20 15:10:56.659362
oai:edoc.mpg.de:2263152006-04-2043:960
InBook
Experiments with Dictyostelium Discoidium Amoebae in Different Geometries
English
World Scientific
Singapore
2004
372
385
12
Dynamics and Bifurcation of Patterns in Dissipative Systems
G. Dangelmayr and I. Oprea
World Scientific Series on Nonlinear Science
G. Dangelmayr and I. Oprea
expertsonly
published
notspecified
C.
Voelz
Camilla
E.
Bodenschatz
Eberhard
Cornell University, Ithaca, NY, USA
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2005
2006-04-20 15:10:25.620026
oai:edoc.mpg.de:2263162006-04-2043:960
InBook
Using microfluidic channel networks to generate gradients for studying cell migration
English
Humana Press
Totowa, NJ, USA
2004-11-30
347
358
294
Cell Migration: Developmental Methods and Protocols
J.-L. Guan
In this chapter, we will discuss a method for the generation of gradients that can be quantitatively used for studying directional cell migration. Microfluidic networks, which serially split and remix small volumes of solutions under laminar flow conditions to generate a series of microchannels of increasing protein concentration. At a juncture of these microchannels, where a single broad channel is formed, a protein concentration gradient can be easily achieved. This method is highly useful because of the ability with which we can control, manipulate and analyze chemical gradients and cells' chemotactic behavior in a quantitative manner.
gradient; microfluidics; migration; chemoattractant; microenvironment; nanobiotechnology
expertsonly
published
notspecified
D. S.
Rhoads
D. S.
S. M.
Nadkarni
S. M.
L.
Song
L.
C.
Voeltz
C.
E.
Bodenschatz
E.
J.-L.
Guan
J.-L.
Cornell University, Ithaca, NY, USA
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2005
2006-04-20 15:09:34.506301
oai:edoc.mpg.de:2265762006-04-2043:960
Article
Experimental apparatus and sample preparation techniques for directional solidification
English
2005
013906-1
013906-9
Review of Scientific Instruments
Rev. Sci. Inst.
76
expertsonly
published
notspecified
B.
Utter
B.
R.
Ragnarsson
R.
E.
Bodenschatz
E.
10.1063/1.1807592
Cornell University, Ithaca, NY, USA
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2006-04-20 15:09:12.003388
oai:edoc.mpg.de:2265872006-04-2043:960
Article
Joint Statistics of the Lagrangian Acceleration and Velocity in Fully Developed Turbulence
English
2005-01-18
024501-1
024501-4
Physical Review Letters
Phys. Rev. Lett.
94
We report experimental results on the joint statistics of the Lagrangian acceleration and velocity in highly turbulent flows. The acceleration was measured up to a microscale Reynolds number R(lambda)=690 using high speed silicon strip detectors from high energy physics. The acceleration variance was observed to be strongly dependent on the velocity, following a Heisenberg-Yaglom-like u(9/2) increase. However, the shape of the probability density functions of the acceleration component conditioned on the same component of the velocity when normalized by the acceleration variance was observed to be independent of velocity and to coincide with the unconditional probability density function of the acceleration components. This observation imposes a strong mathematical constraint on the possible functional form of the acceleration probability distribution function.
expertsonly
published
notspecified
A. M.
Crawford
Alice M.
N.
Mordant
Nicolas
E.
Bodenschatz
Eberhard
10.1103/PhysRevLett.94.024501
http://link.aps.org/abstract/PRL/v94/e024501
Cornell University, Ithaca, NY, USA
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2006-04-20 15:08:41.978194
oai:edoc.mpg.de:2265902006-04-2043:960
Article
Tectonic microplates in a wax model of sea-floor spreading
English
2005-02
37 (37-01)
37 (37-11)
New Journal of Physics
7
expertsonly
published
notspecified
R. F.
Katz
Richard F.
R.
Ragnarsson
Rolf
E.
Bodenschatz
Eberhard
10.1088/1367-2630/7/1/037
S1367-2630(05)89897-0
Cornell University, Ithaca, NY, USA
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2006-04-20 15:07:53.879413
oai:edoc.mpg.de:2447842007-03-2843:960
Article
The effect of zero-point energy differences on the isotope dependence of the formation of ozone: A classical trajectory study
English
2005-03-04
094317-1
094317-9
094317
The Journal of Chemical Physics
122
expertsonly
published
joureview
R.
Schinke
R.
P.
Fleurat-Lessard
P.
Laboratoire de Chimie, Ecole Normale Supérieure de Lyon, 46, Allée d'Italie, 69364 Lyon Cedex 07, France
MPI für Dynamik und Selbstorganisation
2006
2007-03-28 11:43:19.672704
oai:edoc.mpg.de:2447852007-03-2843:960
Article
Experimental and theoretical investigation of the reaction NH(X<sup>3</sup>∑<sup>-</sup>)+H(<sup>2</sup>S) → N(<sup>4</sup>S)+H<sub>2</sub>(X<sup>1</sup>∑<sup>+</sup><sub>g</sub>)
English
2005-03-16
114301-1
114301-7
114301
The Journal of Chemical Physics
122
notspecified
published
notspecified
L.
Adam
L.
W.
Hack
W.
H.
Zhu
H.
Z.-W.
Qu
Z.-W.
R.
Schinke
R.
MPI für Dynamik und Selbstorganisation
2006
2007-03-28 11:43:19.692764
oai:edoc.mpg.de:2494912007-03-2843:960
Article
Experimental and theoretical investigation of the reactions NH(X<sup>3</sup>Σ⁻) + D(<sup>2</sup>S) → ND(X<sup>3</sup>Σ⁻) + H(<sup>2</sup>S) and NH(X<sup>3</sup>Σ⁻) + D(<sup>2</sup>S) → N(<sup>4</sup>S) + HD(X<sup>1</sup>Σ⁺<sub>g</sub>)
English
2005-05-24
204313
Journal of Chemical Physics
122
notspecified
published
notspecified
Z.-W.
Qu
Z.-W.
H.
Zhu
H.
R.
Schinke
R.
L.
Adam
L.
W.
Hack
W.
MPI für Dynamik und Selbstorganisation
Nichtlineare Dynamik
2006
2007-03-28 11:43:19.712084
oai:edoc.mpg.de:2494922007-03-2843:960
Article
The triplet channel in the photodissociation of ozone in the Hartley band: Classical trajectory surface hopping analysis
English
2005-05-17
191102
Journal of Chemical Physics
122
notspecified
published
notspecified
Z. H.
Qu
Z. H.
H.
Zhu
H.
S. Y.
Grebenshchikov
S. Yu.
R.
Schinke
R.
MPI für Dynamik und Selbstorganisation
Nichtlineare Dynamik
2006
2007-03-28 11:43:19.730824
oai:edoc.mpg.de:2494932007-03-2843:960
Article
Assessment of the ozone isotope effect
English
2005-06-23
1
54
Advances in Atomic, Molecular and Optical Physics
50
notspecified
published
notspecified
K.
Mauersberger
K.
D.
Krankowsky
D.
C.
Janssen
C.
R.
Schinke
R.
MPI für Dynamik und Selbstorganisation
Nichtlineare Dynamik
2006
2007-03-28 11:43:19.748584
oai:edoc.mpg.de:2494942007-03-2843:960
Article
Temperature dependent energy transfer in Ar-O<sub>3</sub> collisions
English
2005-06-23
234318
Journal of Chemical Physics
122
notspecified
published
notspecified
M. V.
Ivanov
Mikhail V.
R.
Schinke
Reinhard
10.1063/1.1927526
MPI für Dynamik und Selbstorganisation
Nichtlineare Dynamik
2006
2007-03-28 11:43:19.767154
oai:edoc.mpg.de:2617562007-03-3043:960
Article
Measurement of Lagrangian Acceleration in Turbulent Flows Using the Laser Doppler Technique Optical Methods of Flow Investigation
English
2006-05
626201
Proceedings SPIE
Proc. SPIE
6262
The use of the laser Doppler technique for measuring Lagrangian acceleration with a high spatial resolution is introduced. The requirements in system alignment and accuracy of signal processing is estimated. Specifications of the optical design and the signal processing are given.
popular
published
notspecified
H.
Nobach
H.
M.
Kinzel
M.
C.
Tropea
C.
http://bookstore.spie.org/index.cfm?fuseaction=DetailPaper&ProductId=682916&coden=
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2007
2007-03-30 10:58:50.643231
oai:edoc.mpg.de:2622522006-04-2043:960
Article
Double Dendrite Growth in Solidification
English
2005-07-07
011601-1
011601-6
Physical Review E
Phys. Rev. E
76
We present experiments on the doublon growth morphology in directional solidification. Samples used are succinonitrile with small amounts of poly(ethylene oxide), acetone, or camphor as the solute. Doublons, or symmetry-broken dendrites, are generic diffusion-limited growth structures expected at large undercooling and low anisotropy. Low anisotropy growth is achieved by selecting a grain near the {111} plane leading to either seaweed (dense branching morphology) or doublon growth depending on experimental parameters. We find selection of doublons to be strongly dependent on solute concentration and sample orientation. Doublons are selected at low concentrations (low solutal undercooling) in contrast to the prediction of doublons at large thermal undercooling in pure materials. Doublons also exhibit preferred growth directions and changing the orientation of a specific doublonic grain changes the character and stability of the doublons. We observe transitions between seaweed and doublon growth with changes in concentration and sample orientation.
expertsonly
published
notspecified
B.
Utter
Brian
E.
Bodenschatz
Eberhard
10.1103/PhysRevE.72.011601
Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA. utterbc@jmu.edu
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2006
2006-04-20 15:23:01.73818
oai:edoc.mpg.de:2623492006-04-2043:960
Article
Taking Wax for a Spin: Microplates in an Analog Model of Plate Tectonics
English
2005-09
155
158
Europhysics News
5
expertsonly
published
notspecified
R. F.
Katz
Richard F.
E.
Bodenschatz
Eberhard
Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, USA
Laboratory of Atomic and Solid State Physics, Cornell Unversity, Ithaca, NY, USA
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2006
2006-04-20 15:22:44.06485
oai:edoc.mpg.de:2623542007-03-2843:960
Article
A quantitative study of three-dimensional Lagrangian particle tracking algorithms
English
2006-01-20
301
313
Experiments in Fluids
Exp. Fluids
40
A neural network particle finding algorithm and a new four-frame predictive tracking algorithm are proposed for three-dimensional Lagrangian particle tracking (LPT). A quantitative comparison of these and other algorithms commonly used in three-dimensional LPT is presented. Weighted averaging, one-dimensional and two-dimensional Gaussian fitting, and the neural network scheme are considered for determining particle centers in digital camera images. When the signal to noise ratio is high, the one-dimensional Gaussian estimation scheme is shown to achieve a good combination of accuracy and efficiency, while the neural network approach provides greater accuracy when the images are noisy. The effect of camera placement on both the yield and accuracy of three-dimensional particle positions is investigated, and it is shown that at least one camera must be positioned at a large angle with respect to the other cameras to minimize errors. Finally, the problem of tracking particles in time is studied. The nearest neighbor algorithm is compared with a three-frame predictive algorithm and two four-frame algorithms. These four algorithms are applied to particle tracks generated by direct numerical simulation both with and without a method to resolve tracking conflicts. The new four-frame predictive algorithm with no conflict resolution is shown to give the best performance. Finally, the best algorithms are verified to work in a real experimental environment.
expertsonly
published
joureview
N. T.
Ouellette
Nicholas T.
H.
Xu
Haitao
E.
Bodenschatz
Eberhard
1007/s00348-005-0068-7
Laboratory of Atomic and Solid State Physics, Clark Hall, Cornell University, Ithaca, NY, USA
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2006
2007-03-28 09:48:09.113272
oai:edoc.mpg.de:2623592007-03-2843:960
Article
High Order Lagrangian Velocity Statistics in Turbulence
English
2006-01-19
024503-1
024503-4
Physical Review Letters
Phys. Rev. Lett.
96
We report measurements of the Lagrangian velocity structure functions of orders 1 through 10 in a high Reynolds number (Taylor microscale Reynolds numbers of up to R(lambda) = 815 ) turbulence experiment. Passive tracer particles are tracked optically in three dimensions and in time, and velocities are calculated from the particle tracks. The structure function anomalous scaling exponents are measured both directly and using extended self-similarity and are found to be more intermittent than their Eulerian counterparts. Classical Kolmogorov inertial range scaling is also found for all structure function orders at times that trend downward as the order increases. The temporal shift of this classical scaling behavior is observed to saturate as the structure function order increases at times shorter than the Kolmogorov time scale.
expertsonly
published
joureview
H.
Xu
Haitao
M.
Bourgoin
Mickaël
N. T.
Ouellette
Nicholas T.
E.
Bodenschatz
Eberhard
10.1103/PhysRevLett.96.024503
Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2007
2007-03-28 09:39:41.861544
oai:edoc.mpg.de:2623662006-04-2043:960
Article
On the distribution of Lagrangian accelerations in turbulent flows
English
2005-02-16
58-1
58-9
New Journal of Physics
7
Superstatistical Lagrangian stochastic models are shown to predict accurately the distribution of the magnitude of the acceleration vector in three-dimensional high Reynolds-number turbulence. Distributions are closely log-normal having high tails that are nearly coincident with measured distributions of enstrophy. The findings support the view that the dominant contribution to extreme accelerations comes from centripetal accelerations induced by vortex filaments.
expertsonly
published
notspecified
A. M.
Reynolds
A. M.
N.
Mordant
N.
A. M.
Crawford
A. M.
E.
Bodenschatz
E.
10.1088/1367-2630/7/1/058
Rothamsted Research, Harpenden, Hertfordshire, AL5 2JQ, UK
LASSP, Cornell University, Ithaca, NY 14853, USA
LPS, Ecole Normale Superieure, Paris, France
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2006
2006-04-20 15:21:32.241977
oai:edoc.mpg.de:2646602006-04-2443:960
Article
Multifractal Dimension of Lagrangian Turbulence
2006-03-24
114503-1
114503-4
Physical Review Letters
Phys. Rev. Lett.
96
We report experimental measurements of the Lagrangian multifractal dimension spectrum in an intensely turbulent laboratory water flow by the optical tracking of tracer particles. The Legendre transform of the measured spectrum is compared with measurements of the scaling exponents of the Lagrangian velocity structure functions, and excellent agreement between the two measurements is found, in support of the multifractal picture of turbulence. These measurements are compared with three model dimension spectra. When the nonexistence of structure functions of order less than -1 is accounted for, the models are shown to agree well with the measured spectrum.
expertsonly
published
joureview
H.
Xu
Haitao
N. T.
Ouellette
Nicholas T.
E.
Bodenschatz
Eberhard
http://link.aps.org/abstract/PRL/v96/e114503
10.1103/PhysRevLett.96.114503
Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York, 14853, USA
MPI für Dynamik und Selbstorganisation
2007
2006-04-24 17:43:41.032993
oai:edoc.mpg.de:2808342007-03-2843:960
Article
Recombination of ozone via the chaperon mechanism
English
2006-03-14
104303-1
104303-10
Journal of Chemical Physics
124
expertsonly
published
joureview
M. V.
Ivanov
M. V.
R.
Schinke
R.
MPI für Dynamik und Selbstorganisation
Nichtlineare Dynamik
2007
2007-03-28 11:43:19.784555
oai:edoc.mpg.de:2808402007-03-2843:960
Article
Absorption spectrum and assignment of the Chappuis band of ozone
English
2006-05-28
204313-1
204313-13
Journal of Chemical Physics
124
expertsonly
published
joureview
S. Y.
Grebenshchikov
S. Y.
R.
Schinke
R.
Z.-W.
Qu
Z.-W.
H.
Zhu
H.
MPI für Dynamik und Selbstorganisation
Nichtlineare Dynamik
2007
2007-03-28 11:43:19.812336
oai:edoc.mpg.de:2808422007-03-2843:960
Article
Dynamical studies of the ozone isotope effect: A status report
English
2006
625
661
Annuals Review of Physical Chemistry
57
expertsonly
published
joureview
R.
Schinke
R.
S. Y.
Grebenshchikov
S. Y.
M. V.
Ivanov
M. V.
P.
Fleurat-Lessard
P.
MPI für Dynamik und Selbstorganisation
Nichtlineare Dynamik
2007
2007-03-28 11:43:19.830801
oai:edoc.mpg.de:2808432007-03-2843:960
Article
The photodissociation of ozone in the Hartley band: A theoretical analysis
English
2005-08-15
074305-1
074305-12
Journal of Chemical Physics
123
expertsonly
published
joureview
Z.-W.
Qu
Z.-W.
H.
Zhu
H.
S. Y.
Grebenshchikov
S. Y.
R.
Schinke
R.
MPI für Dynamik und Selbstorganisation
Nichtlineare Dynamik
2006
2007-03-28 11:43:19.84845
oai:edoc.mpg.de:2808442007-03-2843:960
Article
Infrared spectrum of cyclic ozone: A theoretical investigation
English
2005-11
204324-1
204324-7
Journal of Chemical Physics
123
expertsonly
published
notspecified
Z.-W.
Qu
Z.-W.
H.
Zhu
H.
R.
Schinke
R.
MPI für Dynamik und Selbstorganisation
Nichtlineare Dynamik
2006
2007-03-28 11:43:19.865562
oai:edoc.mpg.de:2808462007-03-2843:960
Article
The Huggins band of ozone: Assignment of hot bands
English
2005-01-08
024310-1
024310-8
Journal of Chemical Physics
122
expertsonly
published
joureview
W.
Zhu
W.
Z.-W.
Qu
Z.-W.
S. Y.
Grebenshchikov
S. Y.
R.
Schinke
R.
J.
Malicet
J.
J.
Brion
J.
D.
Daumont
D.
MPI für Dynamik und Selbstorganisation
Nichtlineare Dynamik
2006
2007-03-28 11:43:19.883829
oai:edoc.mpg.de:2814022007-03-2943:960
Article
Nonlinear elastic polymers in random flow
English
2005-09-27
99
108
Journal of Fluid Mechanics
J. Fluid Mech.
540
Polymer stretching in random smooth flows is investigated within the framework of the FENE dumbbell model. The advecting flow is Gaussian and short-correlated in time. The stationary probability density function of polymer extension is derived exactly. The characteristic time needed for the system to attain the stationary regime is computed as a function of the Weissenberg number and the maximum length of polymers. The transient relaxation to the stationary regime is predicted to be exceptionally slow in the proximity of the coil-stretch transition.
expertsonly
published
joureview
M.
Martins Afonso
M.
D.
Vincenzi
D.
10.1017/S0022112005005951
Dipartimento di Fisica, Universita di Genova, Via Dodecaneso 33, 16146 Genova, Italy
LASSP, Clark Hall, Cornell University, Ithaca, NY 14853, USA
MPI für Dynamik und Selbstorganisation
2006
2007-03-29 14:41:54.241632
oai:edoc.mpg.de:2814032006-07-1243:960
Article
Asymmetry-induced particle drift in a rotational flow
2005-07-11
072106-1
072106-5
Physics of Fluids
Phys. Fluids
17
We report on an intriguing phenomenon taking place in a liquid rotating around a fixed horizontal axis. Under suitable conditions, bubbles and particles are observed to drift along the axis of rotation maintaining a constant distance from it and a constant angle of elevation above the horizontal. Absence of fore-aft symmetry of the bubble or particle shape is a prerequisite for this phenomenon. For bubbles, this requires a volume sufficiently large for surface-tension effects to be small and large deformations to be possible. Particle image velocimetry and flow visualization suggest that the wake does not play a role. The dependence on bubble radius, particle shape, liquid viscosity, and speed of rotation is investigated.
expertsonly
published
joureview
J. J.
Bluemink
J. J.
E. A.
van Nierop
E. A.
S.
Luther
S.
N. G.
Deen
N. G.
J.
Magnaudet
J.
A.
Prosperetti
A.
D.
Lohse
D.
10.1063/1.1978921
Faculty of Science and Technology and J M Burgers Center for Fluid Dynamics, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
Institut de Mécanique des Fluides de Toulouse (IMFT), 1 Allée du Professeur Camille Soula, 31400 Toulouse, France
MPI für Dynamik und Selbstorganisation
2006
2006-07-12 00:02:22.497422
oai:edoc.mpg.de:2814042006-07-1243:960
Article
Bubble shape and orientation determination with a four-point optical fibre probe
2005-08
803
812
Experimental Thermal and Fluid Science
Exp. Therm. Fluid Sci.
29
We propose a new method to estimate the aspect ratio and orientation of bubbles by using their time series obtained with a four-point optical-fibre probe. The feasibility and accuracy of the method was first analysed by using synthetic bubble–probe interaction data and single bubble experiments in pure water. Reasonable comparisons between this new technique and image analysis results were obtained. As a next step, the technique is applied to a vertical bubbly pipe flow at high void fraction. The typical bubble spherical equivalent diameter is 2–8 mm. The results provided by these measurements are compared with an available bubble aspect ratio correlation. A reasonable agreement is found. Some first results about the bubble orientation changes with bubble shape in bubbly shear flows are also presented.
expertsonly
published
joureview
S.
Guet
S.
S.
Luther
S.
G.
Ooms
G.
10.1016/j.expthermflusci.2005.03.007
Laboratory for Aero and Hydrodynamics and J.M. Burgers Centre for Fluid Dynamics, Delft University of Technology, Leeghwaterstraat 21, 2628 CA Delft, The Netherlands
Department of Applied Physics and J.M. Burgers Centre for Fluid Dynamics, University of Twente, 7500 AE Enschede, The Netherlands
MPI für Dynamik und Selbstorganisation
2006
2006-07-12 00:04:08.875219
oai:edoc.mpg.de:2814052006-07-1243:960
Article
Data analysis for hot-film anemometry in turbulent bubbly flow
2005-08
821
826
Experimental Thermal and Fluid Science
Exp. Therm. Fluid Sci.
29
We report on a new method for the analysis of hot-film anemometry in turbulent bubbly flows based on stochastic pattern recognition summarizing our results of [J.M. Rensen, S. Luther, J. de Vries, D. Lohse, Hot-film anemometry in bubbly flow I: bubble–probe interaction, in press; S. Luther, J. Rensen, Hot-film anemometry in bubbly flow II: local phase discrimination, in press; J.M. Rensen, S. Luther, D. Lohse, Velocity structure functions in turbulent two-phase flows, J. Fluid Mech., in press]. It consists of an optimal signal decomposition using an adaptive wavelet transform and neural network based classification. We discuss the application of autoregressive models to obtain energy spectra for gapped time series.
expertsonly
published
joureview
S.
Luther
Stefan
J.
Rensen
Judith
T. H.
van den Berg
Thomas H.
D.
Lohse
Detlef
10.1016/j.expthermflusci.2005.03.016
Department of Applied Physics, J.M. Burgers Center for Fluid Dynamics, University of Twente, 7500 AE Enschede, The Netherlands
MPI für Dynamik und Selbstorganisation
2006
2006-07-12 00:06:34.394337
oai:edoc.mpg.de:2814062006-07-1343:960
Proceedings
Full-field correlation-based image processing for PIV
M. Gharib
California Institute of Technology, Pasadena (CA), USA
2005-09
6th International Symposium on Particle Image Velocimetry
Pasadena, California, USA
2005-09-21
2005-09-23
Due to its high robustness, correlation-based particle image velocimetry (PIV) has become the prime choice for processing image-based flow measurements in fluid dynamics experiments. However, in recent years, whole-field techniques like optical flow methods have been successfully applied to this kind of images. To avoid the dependence of optical flow methods on intensity variations and to combine the robustness of the correlation-based PIV technique with the whole-field flow description of the optical flow method, a hybrid estimation procedure has been developed. It is an iterative method, optimizing a dense, hypothetical velocity field with respect to vanishing residual displacements, obtained by image correlation.
expertsonly
11 pages
published
H.
Nobach
Holger
N. T.
Ouellette
Nicholas T.
E.
Bodenschatz
Eberhard
C.
Tropea
C.
LASSP, Cornell University, Clark Hall of Science, Ithaca, NY, USA
Fachgebiet Stroemungslehre und Aerodynamik, Techn. Univ. Darmstadt, Darmstadt, Germany
MPI für Dynamik und Selbstorganisation
2006
2006-07-13 18:36:48.823324
oai:edoc.mpg.de:2814072006-07-1243:960
Article
Hot-film anemometry in bubbly flow I: bubble–probe interaction
2005-03
285
301
International Journal of Multiphase Flow
Int. J. Multiphase Flow
3
31
The interaction between a bubble, which is rising in a descending water flow, and a hot-film anemometer was experimentally investigated using stereoscopic high-speed imaging. The mean downward water velocity varied from 0 up to 0.15 m/s, i.e., relatively low, allowing for an extended bubble–probe interaction. Moreover, the direction of the water causes the wake of the probe to play a role before the bubble touches the probe. The equivalent bubble radii were 0.4–2.8 mm and the bubble velocities relative to the probe ranged from 0.04 to 0.38 m/s. Image processing techniques were applied to reconstruct the bubbles’ path, shape, and orientation during the interaction process. As a result, three types of interactions were found, namely penetrating, bouncing, and splitting interactions. The image sequences were compared with the corresponding time series of the hot-film anemometer. From the time series the type of interaction cannot be deduced, at least not for the analyzed flow situation. Furthermore, we demonstrated that the residence time estimate from the hot-film data is systematically biased in our type of experiments. Finally, it was found that the velocity of a bubble may be altered considerably due to the interaction.
Hot-film anemometry; Bubbly flow; Bubble–probe interaction
expertsonly
published
joureview
J.
Rensen
Judith
S.
Luther
Stefan
J.
de Vries
Joris
D.
Lohse
Detlef
10.1016/j.ijmultiphaseflow.2004.11.005
Department of Science and Technology and J.M. Burgers Center for Fluid Dynamics, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
MPI für Dynamik und Selbstorganisation
2006
2006-07-12 00:09:32.082065
oai:edoc.mpg.de:2814082012-02-2143:960
Article
The effect of bubbles on developed turbulence
2005-08-17
153
187
Journal of Fluid Mechanics
J. Fluid Mech.
538
Hot-film anemometry measurements are performed in a fully developed turbulent bubbly flow. For the bubble detection in the signal, both a threshold method and a new pattern recognition algorithm are employed. The measurements are carried out with gas fractions up to 3% and a mean water velocity of 0.20 m s-1, corresponding to a Reynolds number of about 9x10 4. The typical bubble radius is 1–2 mm, corresponding to 10–20 Kolmogorov length scales. In this regime, a ‘bubblance’ parameter b which compares the kinetic energy originating from the rising bubbles with that of the turbulence fluctuations is smaller than 1. Probability distribution functions, structure functions (with and without the extended self-similarity (ESS) method), and spectra of the water velocity time series are calculated. Both our results for the turbulent energy spectra and the second-order structure functions show qualitative agreement with numerical results by Massitelli, Lohse & Toschi (Phys. Fluids, vol. 15 (2003), p. L5), i.e. a more pronounced energy enhancement on small scales than on large scales owing to the presence of bubbles, leading to a less steep slope in the spectrum as compared to the Kolmogorov -5/3 law. These results are robust, i.e. do not depend on details of the bubble detection scheme.
expertsonly
published
joureview
J.
Rensen
Judith
S.
Luther
Stefan
D.
Lohse
Detlef
10.1017/S0022112005005276
Department of Science and Technology and J. M. Burgers Center for Fluid Dynamics, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands
MPI für Dynamik und Selbstorganisation
2006
2012-02-21 13:42:40.04658
oai:edoc.mpg.de:2814092006-07-1243:960
Article
Drag Reduction in Bubbly Taylor-Couette Turbulence
2005-01-31
044501-1
044501-4
Physical Review Letters
Phys. Rev. Lett.
94
In Taylor-Couette flow the total energy dissipation rate and therefore the drag can be determined by measuring the torque on the system. We do so for Reynolds numbers between Re = 7×10 4 and Re = 10 6 after having injected (i) small bubbles (R = 1 mm) up to a volume concentration of α=5% and (ii) buoyant particles (ρp/ρl = 0.14) of comparable volume concentration. In case (i) we observe a crossover from little drag reduction at smaller Re to strong drag reduction up to 20% at Re = 10 6. In case (ii) we observe at most little drag reduction throughout. Several theoretical models for bubbly drag reduction are discussed in view of our findings.
expertsonly
published
joureview
T. H.
van den Berg
Thomas H.
S.
Luther
Stefan
D. P.
Lathrop
Daniel P.
D.
Lohse
Detlef
http://link.aps.org/abstract/PRL/v94/e044501
10.1103/PhysRevLett.94.044501
Department of Applied Physics, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742, USA
MPI für Dynamik und Selbstorganisation
2006
2006-07-12 00:12:38.95371
oai:edoc.mpg.de:2814102006-07-1243:960
Article
Transitions to Electrochemical Turbulence
2005-05-04
174104-1
174104-4
Physical Review Letters
Phys. Rev. Lett.
94
We report experimental evidence of transitions from limit cycle oscillations through a phase turbulent regime to space-time defect turbulence in a spatially (quasi-)one-dimensional electrochemical system with nonlocal coupling. The transitions are characterized in terms of the defect density, the Karhunen-Loève decomposition dimension, and a measure of the degree of spatial correlation in the data. Furthermore, these quantities give the first experimental confirmation that the spatial coupling range in electrochemical systems indeed depends on the distance between the working and the counterelectrode.
expertsonly
published
joureview
H.
Varela
Hamilton
C.
Beta
Carsten
A.
Bonnefont
Antoine
K.
Krischer
Katharina
http://link.aps.org/abstract/PRL/v94/e174104
10.1103/PhysRevLett.94.174104
Fritz-Haber-Institut der MPG, Faradayweg 4-6, D-14195 Berlin, Germany
Technische Universität München, Physik Department E19, James Franck Strasse 1, D-85748 Garching, Germany
MPI für Dynamik und Selbstorganisation
2006
2006-07-12 00:14:34.299058
oai:edoc.mpg.de:2814112007-03-2843:960
Article
A hierarchy of global coupling induced cluster patterns during the oscillatory H<sub>2</sub>-electrooxidation reaction on a Pt ring-electrode
2005-05-13
2429
2439
Physical Chemistry Chemical Physics
Phys. Chem. Chem. Phys.
7
We report experimental results on spatiotemporal pattern formation during the oscillatory hydrogen electrooxidation reaction on a Pt ring-electrode under negative (desynchronizing) global coupling (GC). Spatially one-dimensional profiles of the interfacial potential drop along the angular direction of the ring electrode are recorded by means of a potential probe. The dynamics is investigated as a function of two control parameters, the applied voltage U and the strength of the global coupling. The latter is adjusted either by varying the distance between the working electrode (WE) and the reference electrode (RE) or by inserting a negative impedance device in series with the WE. In the absence of global coupling, uniform oscillations were destabilized by migration coupling, and electrochemical turbulence developed at large values of U (H. Varela, C. Beta, A. Bonnefont and K. Krischer, Phys. Rev. Lett., 2005, 94, 174104; ref. 1). Already low global coupling strengths sufficed to suppress turbulence. Instead, regular two-phase clusters formed. At higher coupling strength, a second type of two-phase cluster was observed as well as two types of irregular cluster patterns, which were connected with an irregular motion of the cluster boundaries and the emergence and disappearance of clusters through splitting and merging of the boundaries, respectively. Upon increasing the coupling strength even further, five-phase clusters were stabilized and at the highest coupling strength applied the cluster patterns transformed into strongly modulated pulses. The two types of two-phase clusters and the five-phase clusters are analyzed employing several signal processing techniques.
expertsonly
published
joureview
H.
Varela
Hamilton
C.
Beta
Carsten
A.
Bonnefont
Antoine
K.
Krischer
Katharina
10.1039/b502027a
Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany
Physik-Department E19, Technische Universität München, James-Franck-Str. 1, D-85748 Garching, Germany
MPI für Dynamik und Selbstorganisation
2006
2007-03-28 14:20:21.851412
oai:edoc.mpg.de:3073522007-03-2843:960
Article
The Role of Pair Dispersion in Turbulent Flow
English
2006-02-10
835
838
Science
Sci.
311
Mixing and transport in turbulent flows—which have strong local concentration fluctuations—are essential in many natural and industrial systems including reactions in chemical mixers, combustion in engines and burners, droplet formation in warm clouds, and biological odor detection and chemotaxis. Local concentration fluctuations, in turn, are intimately tied to the problem of the separation of pairs of fluid elements. We have measured this separation rate in an intensely turbulent laboratory flow and have found, in quantitative agreement with the seminal predictions of Batchelor, that the initial separation of the pair plays an important role in the subsequent spreading of the fluid elements. These results have surprising consequences for the decay of concentration fluctuations and have applications to biological and chemical systems.
popular
published
joureview
M.
Bourgoin
Mickael
N. T.
Ouellette
Nicholas T.
H.
Xu
Haitao
J.
Berg
Jacob
E.
Bodenschatz
Eberhard
10.1126/science.1121726
Laboratoire des Ecoulements Géophysiques et Industriels-CNRS, Boite Postale 53-38041, Grenoble Cedex 9, France
Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA
Risø National Laboratory, DK-4000 Roskilde, Denmark
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2007
2007-03-28 09:36:56.07079
oai:edoc.mpg.de:3074172007-03-2843:960
Article
Small-scale anisotropy in Lagrangian turbulence
English
2006-06-14
102-1
102-10
New Journal of Physics
NJP
8
We report measurements of the second-order Lagrangian structure function and the Lagrangian velocity spectrum in an intensely turbulent laboratory flow. We find that the asymmetries of the large-scale flow are reflected in the small-scale statistics. In addition, we present new measurements of the Lagrangian structure function scaling constant C0, which is of central importance to stochastic turbulence models as well as to the understanding of turbulent pair dispersion and scalar mixing. The scaling of C0 with the turbulence level is also investigated, and found to be in agreement with an existing model.
expertsonly
published
joureview
N. T.
Ouellette
Nicholas T.
H.
Xu
Haitao
M.
Bourgoin
Mickael
E.
Bodenschatz
Eberhard
10.1088/1367-2630/8/6/102
Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, NY 14853, USA
Laboratoire des Ecoulements Géophysiques et Industriels-C.N.R.S. (U.M.R. 5519), BP 53-38041, Grenoble Cedex 9, France
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2007
2007-03-28 09:42:04.197498
oai:edoc.mpg.de:3074592007-03-2843:960
Article
Dictyostelium discoideum chemotaxis: Threshold for directed motion
2006-09-27
981
989
European Journal of Cell Biology
Eur. J. Cell Biol.
9-10
85
The chemotactic response of Dictyostelium discoideum cells to stationary, linear gradients of cyclic adenosine 3′,5′-monophosphate (cAMP) was studied using microfluidic devices. In shallow gradients of less than 10<sup>−3</sup> nM/μm, the cells showed no directional response and exhibited a constant basal motility. In steeper gradients, cells moved up the gradient on average. The chemotactic speed and the motility increased with increasing steepness up to a plateau at around 10<sup>−1</sup> nM/μm. In very steep gradients, above 10 nM/μm, the cells lost directionality and the motility returned to the sub-threshold level. In the regime of optimal response the difference in receptor occupancy at the front and back of the cell is estimated to be only about 100 molecules.
Chemotaxis; Dictyostelium discoideum; Microfluidics
expertsonly
published
joureview
L.
Song
Loling
S. M.
Nadkarni
Sharvari M.
H. U.
Bödeker
Hendrik U.
C.
Beta
Carsten
A.
Bae
Albert
C.
Franck
Carl
W.-J.
Rappel
Wouter-Jan
W. F.
Loomis
William F.
E.
Bodenschatz
Eberhard
10.1016/j.ejcb.2006.01.012
Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853, USA
Department of Cell Biology, Harvard Medical School, Boston, MA, USA
Institut für Angewandte Physik, Westfälische Wilhelms-Universität Münster, Germany
Department of Physics and Center for Theoretical Biological Physics, University of California, San Diego, La Jolla, CA 92093, USA
Division of Biological Sciences, University of California, San Diego, La Jolla, CA 92093, USA
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2007
2007-03-28 19:29:10.175763
oai:edoc.mpg.de:3075282007-03-2843:960
Article
Lagrangian Measurements of Inertial Particle Accelerations in Grid Generated Wind Tunnel Turbulence
English
2006-10-05
144507-1
144507-4
Physical Review Letters
Phys. Rev. Lett.
97
We describe Lagrangian measurements of water droplets in grid generated wind tunnel turbulence at a Taylor Reynolds number of R<sub>λ</sub>= 250 and an average Stokes number (St) of approximately 0.1. The inertial particles are tracked by a high speed camera moving along the side of the tunnel at the mean flow speed. The standardized acceleration probability density functions of the particles have spread exponential tails that are narrower than those of a fluid particles (St ≈ 0) and there is a decrease in the acceleration variance with increasing Stokes number. A simple vortex model shows that the inertial particles selectively sample the fluid field and are less likely to experience regions of the fluid undergoing the largest accelerations. Recent direct numerical simulations compare favorably with these first measurements of Lagrangian statistics of inertial particles in highly turbulent flows.
expertsonly
published
joureview
S.
Ayyalasomayajula
S.
A.
Gylfason
A.
L. R.
Collins
L. R.
E.
Bodenschatz
E.
Z.
Warhaft
Z.
http://link.aps.org/abstract/PRL/v97/e144507
10.1103/PhysRevLett.97.144507
Mechanical & Aerospace Engineering, Cornell University, Ithaca, New York, USA
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2007
2007-03-28 19:51:10.234815
oai:edoc.mpg.de:3075752007-03-2843:960
Article
An experimental study of turbulent relative dispersion models
English
2006-06-23
109-1
109-23
New Journal of Physics
NJP
85
We report measurements of the spreading rate of pairs of tracer particles in an intensely turbulent laboratory water flow. We compare our measurements of this turbulent relative dispersion with the longstanding work of Richardson and Batchelor, and find excellent agreement with Batchelor's predictions. The distance neighbour function, the probability density function of the relative dispersion, is measured and compared with existing models. We also investigate the recently proposed exit time analysis of relative dispersion.
expertsonly
published
joureview
N. T.
Ouellette
Nicholas T.
H.
Xu
Haitao
M.
Bourgoin
Mickael
E.
Bodenschatz
Eberhard
doi:10.1088/1367-2630/8/6/109
Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, NY 14853, USA
Laboratoire des Ecoulements Géophysiques et Industriels-C.N.R.S. (U.M.R. 5519), BP 53-38041, Grenoble Cedex 9, France
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2007
2007-03-28 09:43:54.835895
oai:edoc.mpg.de:3076642007-03-2843:960
Article
Single polymer dynamics in elongational flow and the confluent Heun equation
English
2006-08-09
10691
10701
Journal of Physics A: Mathematical and General
J. Phys. A: Math. Gen.
39
We investigate the non-equilibrium dynamics of an isolated polymer in a stationary elongational flow. We compute the relaxation time to the steady-state configuration as a function of the Weissenberg number. A strong increase of the relaxation time is found around the coil–stretch transition, which is attributed to the large number of polymer configurations. The relaxation dynamics of the polymer is solved analytically in terms of a central two-point connection problem for the singly confluent Heun equation.
expertsonly
published
joureview
D.
Vincenzi
Dario
E.
Bodenschatz
Eberhard
10.1088/0305-4470/39/34/007
School of Mechanical & Aerospace Engineering, Cornell University, Ithaca, NY 14853, USA
LASSP, Cornell University, Ithaca, NY 14853, USA
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2007
2007-03-28 19:56:44.05139
oai:edoc.mpg.de:3076652007-03-2843:960
Article
Magnetic field transport and kinematic dynamo effect: a Lagrangian interpretation
English
2006-01-08
137
147
Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
Proc. R. Soc. A
462
The growth of magnetic fluctuations in the inertial range of turbulence is investigated in terms of fluid particle dynamics. The existence of dynamo effect is related to the time behaviour of the correlations between tangent vectors evolving along Lagrangian trajectories. In the presence of dynamo effect, the correlations between tangent vectors grow exponentially in time; in the absence of dynamo effect they decay as power laws. The above behaviours are intimately related to statistical conservation laws for the Lagrangian dynamics.
dynamo effect, Lagrangian dynamics, statistical conservation laws
expertsonly
published
joureview
A.
Celani
A.
A.
Mazzino
A.
D.
Vincenzi
D.
10.1098/rspa.2005.1561
CNRS, INLN, 1361 Route des Lucioles, 06560 Valbonne, France
INFM, Dipartimento di Fisica, Università di Genova, Via Dodecaneso 33, 16146 Genova, Italy
Istituto Nazionale di Fisica Nucleare, Sezione di Genova, Via Dodecaneso 33, 16146 Genova, Italy
LASSP, Cornell University, Ithaca, NY 14853, USA
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2007
2007-03-28 20:04:01.968064
oai:edoc.mpg.de:3076682007-03-2843:960
Article
Viscosity Destabilizes Sonoluminescing Bubbles
English
2006-03-20
114301-1
114301-4
Physical Review Letters
Phys. Rev. Lett.
In single-bubble sonoluminescence (SBSL) microbubbles are trapped in a standing sound wave, typically in water or water-glycerol mixtures. However, in viscous liquids such as glycol, methylformamide, or sulphuric acid it is not possible to trap the bubble in a stable position. This is very peculiar as larger viscosity normally stabilizes the dynamics. Suslick and co-workers call this new mysterious state of SBSL "moving-SBSL." We identify the history force (a force nonlocal in time) as the origin of this destabilization and show that the instability is parametric. A force balance model quantitatively accounts for the observed quasiperiodic bubble trajectories.
expertsonly
published
joureview
R.
Toegel
Ruediger
S.
Luther
Stefan
D.
Lohse
Detlef
http://link.aps.org/abstract/PRL/v96/e114301
10.1103/PhysRevLett.96.114301
Faculty of Science & Technology, University of Twente, Post Office Box 217, 7500 AE Enschede, The Netherlands
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2007
2007-03-28 20:15:15.644624
oai:edoc.mpg.de:3076702007-03-2943:960
Article
Energy spectra in microbubbly turbulence
English
2006-03-14
038103-1
038103-3
Physics of Fluids
Phys. Fluids
18
Microbubbles (R<sub>0</sub>=100 µm) are injected in fully developed turbulence (Re<sub>λ</sub>=200) up to a volume concentration of 0.3%. An enhancement of the energy on small scales and a reduction on the large scales is observed, confirming theoretical prediction by I. Mazzitelli, D. Lohse, and F. Toschi [Phys. Fluids 15, L5 (2003)]. The result is a (nonuniversal) less steep slope than –5/3 in the power spectrum.
expertsonly
published
joureview
T. H.
van den Berg
Thomas H.
S.
Luther
Stefan
D.
Lohse
Detlef
10.1063/1.2185688
Department of Applied Physics, University of Twente, PO.Box 217, 7500 AE Enschede, The Netherlands
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2007
2007-03-29 18:22:46.151756
oai:edoc.mpg.de:3076712007-03-2843:960
Article
Defect-mediated turbulence in a catalytic surface reaction
English
2006-08-23
868
874
Europhysics Letters
Europhys. Lett.
6
75
We analyze the statistical properties of topological defects in an experimental reaction-diffusion system—the catalytic CO oxidation on Pt(110). Based on the gain and loss rates of defects, a probabilistic description of defect-mediated turbulence in this system is derived. We observe deviations from theoretical predictions for the statistics of topological defects that can be explained by the presence of short-range correlations between defects and underline the importance of correlations for defect dynamics in such systems.
expertsonly
published
joureview
C.
Beta
C.
A. S.
Mikhailov
A. S.
H. H.
Rotermund
H. H.
G.
Ertl
G.
10.1209/epl/i2006-10215-5
Fritz-Haber-Institut der Max-Planck-Gesellschaft - Faradayweg 4-6 14195 Berlin, Germany
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2007
2007-03-28 20:30:29.051233
oai:edoc.mpg.de:3076722007-03-2943:960
Article
Turbulent bubbly flow
English
2006-02-10
1
12
Journal of Turbulence
J. of Turbulence
14
7
The effect of bubbles on fully developed turbulent flow is investigated numerically and experimentally, summarizing the results of our previous papers (Mazzitelli et al., 2003, Physics of Fluids15, L5. and Journal of Fluid Mechanics 488, 283; Rensen, J. et al. 2005, Journal of Fluid Mechanics 538, 153). On the numerical side, we simulate Navier–Stokes turbulence with a Taylor–Reynolds number of Re<sub>λ</sub> ≈ 60, a large large-scale forcing, and periodic boundary conditions. The point-like bubbles follow their Lagrangian paths and act as point forces on the flow. As a consequence, the spectral slope is less steep as compared to the Kolmogorov case. The slope decrease is identified as a lift force effect. On the experimental side, we do hot-film anemometry in a turbulent water channel with Re<sub>λ</sub> ≈ 200 in which we have injected small bubbles up to a volume percentage of 3%. Here the challenge is to disentangle the bubble spikes from the hot-film velocity signal. To achieve this goal, we have developed a pattern recognition scheme. Furthermore, we injected microbubbles up to a volume percentage of 0.3%. Both in the counter flowing situation with small bubbles and in the co-flow situation with microbubbles, we obtain a less spectral slope, in agreement with the numerical result.
expertsonly
published
joureview
T. H.
van den Berg
Thomas H.
S.
Luther
Stefan
I. M.
Mazzitelli
Irene M.
J. M.
Rensen
Judith M.
F.
Toschi
Federico
D.
Lohse
Detlef
10.1080/14685240500460782
1468-5248
Department of Applied Physics, University of Twente. P.O. Box 217, 7500 AE Enschede, The Netherlands
Istituto per le Applicazioni del Calcolo, CNR. Viale del Policlinico 137, I-00161, Roma, Italy
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2007
2007-03-29 18:25:05.101084
oai:edoc.mpg.de:3076732007-03-3043:960
Conference-Paper
Neue Auflösungsgrenzen von PIV
German
Physikalisch-Technische Bundesanstalt Braunschweig
Braunschweig
2006
4.1
4.8
14. GALA-Fachtagung "Lasermethoden in der Strömungsmesstechnik"
Physikalisch-Technische Bundesanstalt Braunschweig
2006-09-05
2006-09-07
Proceedings der 14. GALA-Fachtagung "Lasermethoden in der Strömungsmesstechnik"
expertsonly
published
notspecified
H.
Nobach
Holger
E.
Bodenschatz
Eberhard
3-9805613-3-X
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2007
2007-03-30 11:26:24.697482
oai:edoc.mpg.de:3076742007-03-3043:960
Conference-Paper
Messung Lagrange'scher Beschleunigungen mittels Laser-Doppler-Anemometrie
German
Physikalisch-Technische Bundesanstalt Braunschweig
Braunschweig
2006
1.1
1.8
14. GALA-Fachtagung "Lasermethoden in der Strömungsmesstechnik"
Physikalisch-Technische Bundesanstalt Braunschweig
2006-09-05
2006-09-07
Proceedings der 14. GALA-Fachtagung "Lasermethoden in der Strömungsmesstechnik"
expertsonly
published
notspecified
M.
Kinzel
M.
H.
Nobach
H.
C.
Tropea
C.
E.
Bodenschatz
E.
3-9805613-3-X
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2007
2007-03-30 11:26:57.623758
oai:edoc.mpg.de:3076752007-03-3043:960
Conference-Paper
New Resolution limits in PIV image processing
English
2006
26.2
13th Int. Symposium on Applications of Laser Techniques to Fluid Mechanics
Lisbon, Portugal
2006-06-26
2006-06-29
13th International Symposium Lisbon
expertsonly
CD
published
notspecified
H.
Nobach
H.
E.
Bodenschatz
E.
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2007
2007-03-30 11:48:01.738482
oai:edoc.mpg.de:3076762007-03-2943:960
Article
Spin-orbit mechanism of predissociation in the Wulf band of ozone
English
2006-07-14
021102-1
021102-4
The Journal of Chemical Physics
J. Chem. Phys.
125
Previously calculated resonance widths of the ground vibrational levels in the electronic states 1 <sup>3</sup>A" (<sup>3</sup>A<sub>2</sub>) and 1 <sup>3</sup>A' (<sup>3</sup>B<sub>2</sub>), which belong to the Wulf band system of ozone, are significantly smaller than observed experimentally. We demonstrate that predissociation is drastically enhanced by spin-orbit coupling between 1 <sup>3</sup>A"/X <sup>1</sup>A' and 1 <sup>3</sup>A'/1 <sup>3</sup>A". Multistate quantum mechanical calculations using ab initio spin-orbit coupling matrix elements give linewidths of optically bright components of the right order of magnitude.
ozone; predissociation; vibrational states; spin-orbit interactions; ground states; ab initio calculations
expertsonly
published
joureview
S. Y.
Grebenshchikov
S. Y.
Z.-W.
Qu
Z.-W.
H.
Zhu
H.
R.
Schinke
R.
10.1063/1.2219444
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2007
2007-03-29 17:25:53.367402
oai:edoc.mpg.de:3076772007-03-2943:960
Article
Reaction paths and elementary bifurcations tracks: The diabatic <sup>1</sup>B<sub>2</sub>-state of ozone
English
2006-07
1913
1928
International Journal of Bifurcation and Chaos
7
16
Bifurcations of equilibrium points and periodic orbits are common in nonlinear dynamical systems when some parameters change. The vibrational motions of a molecule are nonlinear, and the bifurcation phenomena are seen in spectroscopy and chemical reactions. Bifurcations may lead to energy localization in speciﬁc bonds, and thus, they have important consequences for elementary chemical reactions, such as isomerization and dissociation/association. In this article we investigate how elementary bifurcations, such as saddle-node and pitchfork bifurcations, appear in small molecules and show their manifestations in the quantum mechanical frequencies and in the topology of wave functions. We present the results of classical and quantum mechanical calculations on a new (diabatic) potential energy surface of ozone for the <sup>1</sup>B<sub>2</sub> state. This excited electronic state of ozone is pertinent for the absorption of the harmful UV radiation from the sun. We demonstrate that regular localized overtone states, which extend from the bottom of the well up to the dissociation or isomerization barrier, are associated with families of periodic orbits emanated from elementary bifurcations.
bifurcation theory; periodic orbits; classical and quantum molecular dynamics
expertsonly
published
joureview
S. C.
Farantos
S. C.
Z.-W.
Qu
Z.-W.
H.
Zhu
H.
R.
Schinke
R.
10.1142/S0218127406015799
Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas and Department of Chemistry, University of Crete, Iraklion 71110, Crete, Greece
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2007
2007-03-29 17:48:46.512606
oai:edoc.mpg.de:3076782007-03-2943:960
Article
Energies and spatial features for the rotationless bound states of <sup>4</sup>He<sub>3</sub><sup>+</sup> (<sup>2</sup>Σ<sub>g</sub><sup>+</sup>): A cationic core from helium cluster ionization
English
2006-10-28
164304-1
164304-9
The Journal of Chemical Physics
J. Chem. Phys.
125
Ab initio quantum calculations have been carried out on the helium ionic trimer. The potential energy surface is accurately fitted, especially in the vicinity of the three equivalent minima. The spectrum of bound states for the zero angular momentum is computed and analyzed in detail. Energies and wave functions reveal several interesting features related to the fact that He<sub>3</sub><sup>+</sup> represents one of the few homonuclear ionic trimers that are linear in their ground vibrational state. At low energies, the triply degenerate eigenfunctions are localized at the potential minimum. With growing excitation energy, however, the wave functions exhibit stronger spatial delocalization.
helium ions; positive ions; atomic clusters; ionisation; ab initio calculations; potential energy surfaces; ground states; vibrational states; molecular configurations; wave functions; bound states
expertsonly
published
joureview
E.
Scifoni
E.
F. A.
Gianturco
F. A.
S. Y.
Grebenshchikov
S. Y.
R.
Schinke
R.
10.1063/1.2358986
Department of Chemistry, University of Rome La Sapienza, Piazzale A. Moro 5, I-00185 Rome, Italy and CNISM, University of Rome La Sapienza, Piazzale A. Moro 5, I-00185 Rome, Italy
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2007
2007-03-29 17:51:14.110141
oai:edoc.mpg.de:3076792007-03-3043:960
Conference-Paper
Measurement of Lagrangian acceleration using the laser Doppler technique
English
2006
17.4
13th Int. Symposium on Applications of Laser Techniques to Fluid Mechanics
Lisbon, Portugal
2006-06-26
2006-06-29
13th International Symposium Lisbon
expertsonly
CD
published
notspecified
M.
Kinzel
M.
H.
Nobach
H.
C.
Tropea
C.
E.
Bodenschatz
E.
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2007
2007-03-30 11:48:56.027103
oai:edoc.mpg.de:3099192007-03-2943:960
Article
Dynamical Slowdown of Polymers in Laminar and Random Flows
English
2006-09-15
118301-1
118301-4
Physical Review Letters
Phys. Rev. Lett.
97
The influence of an external flow on the relaxation dynamics of a single polymer is investigated theoretically and numerically. We show that a pronounced dynamical slowdown occurs in the vicinity of the coil-stretch transition, especially when the dependence on polymer conformation of the drag is accounted for. For the elongational flow, relaxation times are exceedingly larger than the Zimm relaxation time, resulting in the observation of conformation hysteresis. For random smooth flows, hysteresis is not present. Yet, relaxation dynamics is significantly slowed down because of the large variety of accessible polymer configurations. The implications of these results for the modeling of dilute polymer solutions in turbulent flows are addressed.
expertsonly
published
joureview
A.
Celani
A.
A.
Puliafito
A.
D.
Vincenzi
D.
http://link.aps.org/abstract/PRL/v97/e118301
10.1103/PhysRevLett.97.118301
CNRS-INLN, 1361 Route des Lucioles, 06560 Valbonne, France
Sibley School of Mechanical and Aerospace Engineering and LASSP, Cornell University, Ithaca, New York 14853, USA
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2007
2007-03-29 14:43:19.924951
oai:edoc.mpg.de:3503352008-03-2043:960
Article
Flow Photolysis for Spatiotemporal Stimulation of Single Cells
English
2007-05-15
3940
3944
Analytical Chemistry
Anal. Chem.
79
Quantitative studies of cellular systems require experimental techniques that can expose single cells to well-controlled chemical stimuli with high spatiotemporal resolution. Here, we combine microfluidic techniques with the photochemical release of caged signaling molecules to generate tailored stimuli on the length scale of individual cells with subsecond switching times. We exemplify this flexible approach by initiating membrane translocation of fluorescent fusion proteins in chemotactic Dictyostelium discoideum cells.
expertsonly
published
joureview
C.
Beta
Carsten
D.
Wyatt
Danica
W.-J.
Rappel
Wouter-Jan
E.
Bodenschatz
Eberhard
00032700
Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA;
Center for Theoretical Biological Physics and Department of Physics, University of California, San Diego, La Jolla, California 92093, USA
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2008
2008-03-20 15:52:51.166318
oai:edoc.mpg.de:3503382008-03-2043:960
Article
High Frequency Periodic Forcing of the Oscillatory Catalytic CO Oxidation on Pt (110)
English
2007-03-19
61-1
61-18
New Journal of Physics
NJP
3
9
Resonant periodic forcing is applied to catalytic CO oxidation on platinum (110) in the oscillatory regime. The external parameters are chosen such that the unperturbed system spontaneously develops chemical turbulence. By periodically modulating the CO partial pressure, changes in the spatiotemporal behaviour of the system can be induced: the turbulent behaviour is suppressed and frequency locked patterns with sub-harmonic entrainment develop. A novel gas-driving compressor has been implemented to perform the experimental work.
expertsonly
published
joureview
P. S.
Bodega
P. S.
P.
Kaira
P.
C.
Beta
Carsten
D.
Krefting
D.
D.
Bauer
D.
B.
Mirwald-Schulz
B.
C.
Punckt
Christian
H. H.
Rotermund
H. H.
10.1088/1367-2630/9/3/061
S1367-2630(07)39135-0
Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany;
Charité - Universitätsmedizin Berlin, Campus Benjamin Franklin (CBF), Hindenburgdamm 30, 12200 Berlin, Germany;
Department of Physics and Atmospheric Science, Dalhousie University, Halifax, NS B3H 3J5 Canada
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2008
2008-03-20 16:18:15.272143
oai:edoc.mpg.de:3503502008-03-2543:960
Article
Exploring Renner-Teller induced quenching in the reaction
H(<sup>2</sup>S) + NH(a<sup>1</sup>∆): A combined experimental and theoretical study
English
2007
034304-1
034304-13
Journal of Chemical Physics
J. Chem. Phys.
126
expertsonly
published
joureview
L.
Adam
Lutz
W.
Hack
Walter
G. C.
Mcbane
George C.
H.
Zhu
Hui
Z.-W.
Qu
Zheng-Wang
R.
Schinke
Reinhard
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2008
2008-03-25 11:53:59.713137
oai:edoc.mpg.de:3503552008-03-2643:960
Conference-Paper
Grenzen von PIV durch individuelle Intensitätsänderung von Streuteilchen
German
2007
11.1
11.8
11
15. Fachtagung "Lasermethoden in der Strömungsmesstechnik"
Rostock
2007-09-04
2007-09-06
15. Fachtagung "Lasermethoden in der Strömungsmesstechnik"
expertsonly
published
notspecified
H.
Nobach
Holger
E.
Bodenschatz
Eberhard
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2008
2008-03-26 11:22:07.666946
oai:edoc.mpg.de:3503572008-03-2643:960
Conference-Paper
Limitations of Accuracy in PIV due to Individual Variations of Particle Image Intensities
English
2007
1
15
7th International Symposium on Particle Image Velocimetry
Rome
2007-09-11
2007-09-14
PIV 2007
expertsonly
CD-ROM
published
intrev
H.
Nobach
Holger
E.
Bodenschatz
Eberhard
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2008
2008-03-26 11:54:10.122624
oai:edoc.mpg.de:3504532008-03-2043:960
InBook
Measuring Lagrangian Statistics in Intense Turbulence
English
Springer-Verlag
Berlin
2007
789
799
Springer Handbook of Experimental Fluid Dynamics
C. Tropea, J. Foss, & A. Yarin
expertsonly
published
joureview
N. T.
Ouellette
Nicholas T.
H.
Xu
Haitao
E.
Bodenschatz
Eberhard
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2008
2008-03-20 16:51:56.23128
oai:edoc.mpg.de:3504972008-03-2043:960
Article
Wave Emission from Heterogeneities Opens a Way to Controlling Chaos in the Heart
English
2007-11-13
208101-1
208101-4
Physical Review Letters
Phys. Rev. Lett.
99
The effectiveness of chaos control in large systems increases with the number of control sites. We find that electric field induced wave emission from heterogeneities (WEH) in the heart gives a unique opportunity to have as many control sites as needed. The number of pacing sites grows with the amplitude of the electric field. We demonstrate that WEH has important advantages over methods used in clinics, and opens a new way to manipulate vortices in experiments, and potentially to radically improve the clinical methods of chaos control in the heart.
expertsonly
published
joureview
A.
Pumir
Alain
V.
Nikolski
V.
M.
Hörning
M.
A.
Isomura
A.
K.
Agladze
K.
K.
Yoshikawa
K.
R.
Gilmour
Robert
E.
Bodenschatz
Eberhard
V.
Krinsky
Valentin
http://link.aps.org/abstract/PRL/v99/e208101
10.1103/PhysRevLett.99.208101
Institut Non Linéaire de Nice, CNRS,F-06560 Valbonne, France;
Medtronic Inc., 7000 Central Avenue Nebraska, MS CW330 Fridley Minnesota 55432-3576, USA;
Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan;
Department of Biomedical Sciences, T7 012C VRT, Cornell University, Ithaca, New York 14853-6401, USA
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2008
2008-03-20 16:53:04.997906
oai:edoc.mpg.de:3505212008-03-2043:960
Article
Formation and Stability of Band Patterns in a Rotating Suspension-Filled Cylinder
English
2007-08-31
026221-1
026221-9
Physical Review E
Phys. Rev. E
76
We explore the phenomenon of segregation and pattern formation in the complex system of a rotating horizontal cylinder completely filled with a dilute suspension of non-Brownian particles. A general dimensionless analysis is presented, which reveals the importance of the different dimensionless parameters involved. A detailed account of the mechanism of segregation and formation of axial bands for the case of low viscosity fluids is given. According to the analysis the axial pressure gradient associated with an inertial-mode excitation within the bounded fluid is responsible for the formation of bands in interleaving nodal planes of the excitation. The question of stability of the band patterns is addressed and a phase diagram in the appropriate dimensionless space is presented.
expertsonly
published
joureview
G.
Seiden
Gabriel
M.
Ungarish
M.
S. G.
Lipson
Stephen G.
http://link.aps.org/abstract/PRE/v76/e026221
10.1103/PhysRevE.76.026221
Department of Physics, Technion-Israel Institute of Technology, Haifa 32000, Israel;
Department of Computer Science, Technion-Israel Institute of Technology, Haifa 32000, Israel
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2008
2008-03-20 16:53:46.436468
oai:edoc.mpg.de:3505252008-03-2643:960
Conference-Paper
Application of Laser Doppler Velocity Profile Sensor to Turbulent Flows: Measurement of Water Channel Flow and Two-Point Correlation
English
2007
3.1
3.6
15. Fachtagung "Lasermethoden in der Strömungsmesstechnik"
Rostock
2007-09-04
2007-09-06
Lasermethoden in der Strömungsmesstechnik
expertsonly
published
notspecified
K.
Shirai
K.
C.
Bayer
C.
H.
Nobach
Holger
C.
Klaucke
C.
H.
Voigt
H.
L.
Büttner
L.
J.
Czarske
J.
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2008
2008-03-26 10:54:41.498968
oai:edoc.mpg.de:3505272008-03-2043:960
Article
Stretching of Polymers in Isotropic Turbulence: A Statistical Closure
English
2007-01-12
024503-1
024503-4
Physical Review Letters
Phys. Rev. Lett.
2
98
We present a new closure for the mean rate of stretching of a dissolved polymer by homogeneous isotropic turbulence. The polymer is modeled by a bead-spring-type model (e.g., Oldroyd B, FENE-P, Giesekus) and the analytical closure is obtained assuming the Lagrangian velocity gradient can be modeled as a Gaussian, white-noise stochastic process. The resulting closure for the mean stretching depends upon the ratio of the correlation time for strain and rotation. Additionally, we derived a second-order expression for circumstances when strain and rotation have a finite correlation time. Finally, the base level closure is shown to reproduce results from direct numerical simulations by simply modifying the coefficients.
expertsonly
published
joureview
D.
Vincenzi
Dario
S.
Jin
Shi
E.
Bodenschatz
Eberhard
L. R.
Collins
Lance R.
http://link.aps.org/abstract/PRL/v98/e024503
10.1103/PhysRevLett.98.024503
0031-9007
Sibley School of Mechanical & Aerospace Engineering, Cornell University, Ithaca, New York 14853, USA;
Laboratory for Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2008
2008-03-20 16:55:03.657083
oai:edoc.mpg.de:3505282008-03-2043:960
InBook
Statistical Closures for Homogeneous Shear Flow Turbulence of Dilute Polymer Solutions
English
Springer
Berlin, Heidelberg
2007
261
264
Springer Proceedings in Physics, Progress in Turbulence II, Proceedings of the iTi Conference in Turbulence 2005
Martin Oberlack, George Khujadze, Silke Günther, Tanja Weller, Michael Frewer, Joachim Peinke and Stephan Barth
expertsonly
published
joureview
D.
Vincenzi
Dario
S.
Jin
S.
T.
Vaithianathan
T.
L. R.
Collins
Lance R.
E.
Bodenschatz
Eberhard
10.1007/978-3-540-32603-8_53
978-3-540-32602-1 (Print) 978-3-540-32603-8 (Online)
Laboratory for Atomic and Solid State Physics, Cornell University, Ithaca, NY 14853, USA;
Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY 14853, USA
MPI für Dynamik und Selbstorganisation
Hydrodynamik und Strukturbildung
2008
2008-03-20 16:56:42.336122
ResultSet_2B9LuoBRG23_range_100-199