Soret separation in a binary liquid mixture near its critical temperature

J. C. Legros, Yu Gaponenko, T. Lyubimova, V. Shevtsova

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    Abstract

    Abstract: The values of transport coefficients near a critical point are typically enhanced compared to the values in the classical region far away from a critical point. We report on the impact of the asymptotic behavior of the mass diffusion near the critical region on the Soret separation of the components in a model binary mixture. Concentration patterns are numerically investigated in the case of a spatially varying temperature. The Soret separation in ordinary mixture leads to the establishing of a linear concentration distribution in a steady state. The presence of the critical point redistributes the concentration field, it creates a thin layer with sharp concentration change at the critical region which can be seen as a horizontal plateau on vertical profiles. Large concentration gradients are established across this layer. The analysis showed that the kinetic of the separation significantly depends on whether the critical temperature is inside or outside of the applied temperature region, which is Tcold≤ T ≤ Thot. Critical separation road is suggested for the case when Tcris located inside this region, Tcold≤ Tcr≤ Thot.

    Original languageEnglish
    Article number89
    Pages (from-to)1-6
    Number of pages6
    JournalEuropean Physical Journal E
    Volume37
    Issue number10
    DOIs
    Publication statusPublished - 3 Oct 2014

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    Keywords

    • Topical Issue: Thermal non-equilibrium phenomena in multi-component fluids

    ASJC Scopus subject areas

    • Biotechnology
    • Biophysics
    • Chemistry(all)
    • Materials Science(all)
    • Surfaces and Interfaces

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