Long-wavelength nonequilibrium concentration fluctuations induced by the Soret effect

作     者：José María Ortiz de Zárate José Antonio Fornés Jan V. Sengers 

作者机构：Institute for Physical Science and Technology and Burgers Program for Fluid Dynamics University of Maryland College Park Maryland 20742 USA 

出 版 物：《Physical Review E》 (物理学评论E辑：统计、非线性和软体物理学)

年 卷 期：2006年第74卷第4期

页      面：046305-046305页

核心收录：

学科分类：07[理学] 070203[理学-原子与分子物理] 0702[理学-物理学] 

主　　题：GIANT FLUCTUATIONS BENARD PROBLEM LIQUID EQUILIBRIUM DIFFUSION STATES FLUID BOUNDARIES MIXTURES GRAVITY 

摘      要：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.