2026-06-27T13:54:07Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/512392024-09-06T17:08:30Zcom_20.500.14352_14col_20.500.14352_15

Ortiz De Zárate Leira, José María Fornés, José Antonio Sengers, Jan V. 2023-06-20T10:47:49Z 2023-06-20T10:47:49Z 2006-10 1539-3755 10.1103/PhysRevE.74.046305 https://hdl.handle.net/20.500.14352/51239 http://dx.doi.org/10.1103/PhysRevE.74.046305 http://journals.aps.org/ 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. eng open access Long-wavelength nonequilibrium concentration fluctuations induced by the Soret effect journal article