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Long-wavelength nonequilibrium concentration fluctuations induced by the Soret effect

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Ortiz de Zárate Leira, José María and Fornés, José Antonio and Sengers, Jan V. (2006) Long-wavelength nonequilibrium concentration fluctuations induced by the Soret effect. Physical Review E, 74 (4). ISSN 1539-3755

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Official URL: http://dx.doi.org/10.1103/PhysRevE.74.046305


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Abstract

In this paper we evaluate the enhancement of nonequilibrium concentration fluctuations induced by the Soret effect when a binary fluid layer is subjected to a stationary temperature gradient. Starting from the fluctuating Boussinesq equations for a binary fluid in the large-Lewis-number approximation, we show how one can obtain an exact expression for the nonequilibrium structure factor in the long-wavelength limit for a fluid layer with realistic impermeable and no-slip boundary conditions. A numerical calculation of the wave-number dependence of the nonequilibrium enhancement and of the corresponding decay rate of the concentration fluctuations is also presented. Some physical consequences of our results are briefly discussed.


Item Type:Article
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© 2006 The American Physical Society.

Uncontrolled Keywords:Giant Fluctuations, Benard Problem, Liquid, Equilibrium, Diffusion, States, Fluid, Boundaries, Mixtures, Gravity
Subjects:Sciences > Physics > Thermodynamics
ID Code:27331
Deposited On:17 Nov 2014 13:51
Last Modified:20 Nov 2014 09:41

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