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We consider a horizontal fluid layer between two rigid boundaries, maintained in a stationary thermal nonequilibrium state below the convective Rayleigh-Benard instability. We derive an explicit expression for the nonequilibrium structure factor[...]texto impreso
Recently, Wada [Phys. Rev. E 69, 031202 (2004)] presented an analysis of the long-range nature of concentration fluctuations in a binary liquid mixture subjected to a concentration gradient in a uniform shear flow as a function of the wave numbe[...]texto impreso
Ortiz de Zárate Leira, José María ; Sengers, Jan V. ; Bedeaux, Dick ; Kjelstrup, Signe | American Institute of Physics | 2007-07-21In this paper a simple reaction-diffusion system, namely a binary fluid mixture with an association-dissociation reaction between the two components, is considered. Fluctuations at hydrodynamic spatiotemporal scales when a temperature gradient i[...]texto impreso
Li, W. B. ; Zhang, K. J. ; Sengers, Jan V. ; Gammon, R. W. ; Ortiz de Zárate Leira, José María | American Physical Society | 1998-12-21We have performed small-angle Rayleigh light-scattering measurements in polymer solutions under various externally applied temperature gradients. Our experiments confirm the existence of an enhancement of the concentration fluctuations. The none[...]texto impreso
Oh, Jaechul ; Ortiz de Zárate Leira, José María ; Sengers, Jan V. ; Ahlers, Guenter | American Physical Society | 2004-02We present experimental data and their theoretical interpretation for the decay rates of temperature fluctuations in a thin layer of a fluid heated from below and confined between parallel horizontal plates. The measurements were made with the m[...]texto impreso
We consider a horizontal binary-liquid layer that is subjected to a stationary temperature gradient while still being maintained in a stable quiescent state without any convection. In such a thermal nonequilibrium state the Soret effect induces [...]texto impreso
Starting from the linearized fluctuating Boussinesq equations we derive an expression for the structure factor of fluids in stationary convection-free thermal nonequilibrium. states, taking into account both gravity and finite-size effects. It i[...]texto impreso
Extension of a description of mass diffusion in binary fluids based on Fick's law to multicomponent fluids requires introduction of diffusion matrices. A problem is that Fick diffusion matrices commonly adopted for multicomponent fluids depend o[...]texto impreso
We use fluctuating hydrodynamics to evaluate the enhancement of thermally excited fluctuations in laminar fluid flow using plane Couette flow as a representative example. In a previous publication (J. Stat. Phys. 144:774, 2011) we derived the en[...]texto impreso
Li, W. B. ; Zhang, K. J. ; Sengers, Jan V. ; Gammon, R. W. ; Ortiz de Zárate Leira, José María | American Institute of Physics | 2000-05-22We have performed light-scattering measurements in dilute and semidilute polymer solutions of polystyrene in toluene when subjected to stationary temperature gradients. Five solutions with concentrations below and one solution with a concentrati[...]texto impreso
Ortiz de Zárate Leira, José María ; Fornés, José Antonio ; Sengers, Jan V. | American Physical Society | 2006-10In 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 fo[...]texto impreso
Kirkpatrick, T. R. ; Ortiz de Zárate Leira, José María ; Sengers, Jan V. | American Physical Society | 2016-03-11In this article we derive expressions for Casimir-like pressures induced by nonequilibrium concentration fluctuations in liquid mixtures. The results are then applied to liquid mixtures in which the concentration gradient results from a temperat[...]texto impreso
In this paper we investigate intrinsic thermally excited nonequilibrium velocity fluctuations in laminar planar Couette flow. For this purpose we have complemented the solution of the stochastic Orr-Sommerfeld equation for the intensity of the f[...]texto impreso
We present an analysis of the transverse-velocity fluctuations in an isothermal liquid layer with a uniform shear rate between two parallel horizontal boundaries as a function of the wave number and the Reynolds number. The results were obtained[...]
