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          Institute: MPI für Polymerforschung     Collection: MPI Polymerforschung     Display Documents

ID: 28346.0, MPI für Polymerforschung / MPI Polymerforschung
Phase separation in binary fluid mixtures with continuously ramped temperature
Authors:Cates, M. E.; Vollmer, J.; Wagner, A.; Vollmer, D.
Date of Publication (YYYY-MM-DD):2003-04-15
Title of Journal:Philosophical Transactions of the Royal Society of London Series A-Mathematical Physical and Engineering Sciences
Journal Abbrev.:Philos. Trans. R. Soc. Lond. Ser. A-Math. Phys. Eng. Sci.
Issue / Number:1805
Start Page:793
End Page:804
Review Status:not specified
Audience:Not Specified
Abstract / Description:We consider the demixing of a binary fluid mixture, under gravity, which is steadily driven into a two-phase region by slowly ramping the temperature. We assume, as a first approximation, that the system remains spatially isothermal, and we examine the interplay of two competing nonlinearities. One of these arises because the supersaturation is greatest far from the meniscus, creating inversions of the density which can lead to fluid motion; although isothermal, this is somewhat like the Benard problem (a single-phase fluid heated from below). The other is the intrinsic diffusive instability which results either in nucleation or in spinodal decomposition at large supersaturations. Experimental results on a simple binary mixture show interesting oscillations in heat capacity and optical properties, for a wide range of ramp parameters. We argue that these oscillations arise under conditions where both nonlinearities are important.
Free Keywords:demixing; gravity; temperature ramp; binary fluids
Comment of the Author/Creator:Date: 2003, APR 15
External Publication Status:published
Document Type:Article
Affiliations:MPI für Polymerforschung
External Affiliations:Univ Edinburgh, Sch Phys, James Clerk Maxwell Bldg, Kings Bldg, Mayfield Rd, Edinburgh EH9 3JZ, Midlothian, Scotland; Univ Mainz, Inst Chem Phys, D-55099 Mainz, Germany; N Dakota State Univ, Dept Phys, Fargo, ND 58105 USA
Identifiers:ISI:000182399900025 [ID No:1]
ISSN:1364-503X [ID No:2]
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