Información del autor
Autor Ortiz de Zárate Leira, José María |
Documentos disponibles escritos por este autor (30)
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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
Bedeaux, D. ; Ortiz de Zárate Leira, José María ; Pagonabarraga, I. ; Sengers, J. V. ; Kjelstrup, S. | American Institute of Physics | 2011-09-28In this paper, we consider a simple reaction-diffusion system, namely, a binary fluid mixture with an association-dissociation reaction between two species. We study fluctuations at hydrodynamic spatiotemporal scales when this mixture is driven [...]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
Giraudet, Cédric ; Bataller, Henri ; Sun, Yifei ; Donev, Aleksandar ; Ortiz de Zárate Leira, José María ; Croccolo, Fabrizio | Springer | 2016-12-12In a recent letter (C. Giraudet et al., EPL 111, 60013 (2015)) we reported preliminary data showing evidence of a slowing-down of non-equilibrium fluctuations of the concentration in thermodiffusion experiments on a binary mixture of miscible fl[...]texto impreso
Godino Gómez, María Paz ; Peña, Luis ; Ortiz de Zárate Leira, José María ; Mengual Cabezón, Juan Ignacio | Taylor & Francis Inc | 1995Water transport in the vapor phase through a porous hydrophobic membrane has been studied in different experimental situations. Pure water and/or different aqueous solutions of sodium chloride, ranging from 0.5 to 5 mol/L, were employed on both [...]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
Kirkpatrick, T. R. ; Ortiz de Zárate Leira, José María ; Sengers, J. V. | American Physical Society | 2014-02-28Correlations in fluids in nonequilibrium steady states are long range. Hence, finite-size effects have important consequences in the nonequilibrium thermodynamics of fluids. One consequence is that nonequilibrium temperature fluctuations induce [...]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
Kirkpatrick, T. R. ; Ortiz de Zárate Leira, José María ; Sengers, J. V. | American Physical Society | 2013-06-07In this Letter, we consider the fluctuation-induced force exerted between two plates separated by a distance L in a fluid with a temperature gradient. We predict that for a range of distances L, this nonequilibrium force is anomalously large com[...]texto impreso
The GRADFLEX experiment of ESA has shown that under microgravity conditions a stationary thermodiffusion process is accompanied by giant non-equilibrium fluctuations with size as large as the size of the sample. In the presence of small concentr[...]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
Mialdun, A. ; Sechenyh, V. ; Legros, J. C. ; Ortiz de Zárate Leira, José María ; Shevtsova, V. | American Institute of Physics | 2013-09-14We present a comprehensive analysis of experimental results obtained for Fickian diffusion in the benchmark ternary liquid mixture of 1,2,3,4-tetrahydronaphthalene, isobutylbenzene, and dodecane (nC(12)) with equal mass fractions. Isothermal dif[...]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
Ortiz de Zárate Leira, José María ; Luis Hita, Jorge ; Khayet Souhaimi, Mohamed ; Legido, José Luis | Elsevier | 2010-11We measured using the multi-current hot-wire method the thermal conductivity (lambda) of two different clay pastes suitable to be used as peloids The same wire and system was used to measure the lambda of water and the results were compared with[...]texto impreso
Vázquez Peñas, José R. ; Ortiz de Zárate Leira, José María ; Khayet Souhaimi, Mohamed | American Institute of Physics | 2008-08-15We present experimental results of the thermal conductivity of several nanofluids prepared by dispersing nanoparticles of SiO(2) and CuO in water and ethylene glycol at various concentrations up to approximate to 5% in mass fraction. The measure[...]texto impreso
Kirkpatrick, T. R. ; Ortiz de Zárate Leira, José María ; Sengers, J. V. | American Physical Society | 2015-07-14In this Letter, we consider a liquid mixture confined between two thermally conducting walls subjected to a stationary temperature gradient. While in a one-component liquid nonequilibrium fluctuation forces appear inside the liquid layer, nonequ[...]texto impreso
In stationary nonequilibrium states coupling between hydrodynamic modes causes thermal fluctuations to become long ranged inducing nonequilibrium Casimir pressures. Here we consider nonequilibrium Casimir pressures induced in liquids by a veloci[...]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
Giraudet, Cédric ; Bataller, Henri ; Sun, Yifei ; Donev, Aleksander ; Ortiz de Zárate Leira, José María ; Croccolo, Fabrizio | European Physical Society | 2015-09Fluctuations in a fluid are strongly affected by the presence of a macroscopic gradient making them long- ranged and enhancing their amplitude. While small-scale fluctuations exhibit diffusive lifetimes, moderate-scale fluctuations live shorter [...]