%0 Journal Article
%A Ortiz De Zárate Leira, José María
%A Fornés, José Antonio
%A Sengers, Jan V.
%T Long-wavelength nonequilibrium concentration fluctuations induced by the Soret effect
%D 2006
%@ 1539-3755
%U https://hdl.handle.net/20.500.14352/51239
%X 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.
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