Fluctuation-induced pressures in fluids in thermal nonequilibrium steady states



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Kirkpatrick, T. R. and Ortiz de Zárate Leira, José María and Sengers, J. V. (2014) Fluctuation-induced pressures in fluids in thermal nonequilibrium steady states. Physical Review E, 89 (2). ISSN 1539-3755

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Official URL: http://dx.doi.org/10.1103/PhysRevE.89.022145


Correlations 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 nonequilibrium Casimir-like pressures proportional to the square of the temperature gradient. Hence, fluctuations cause a breakdown of the concept of local thermal equilibrium. Furthermore, transport coefficients become dependent on boundary conditions and on gravity. Thus nonequilibrium fluctuations affect some traditional concepts in nonequilibrium thermodynamics.

Item Type:Article
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© 2014 American Physical Society. The research was supported by the US National Science Foundation under Grant No. DMR-09-01907. We thank M. L. Huber, E. W. Lemmon, and R. A. Perkins of the US National Institute of Standards and Technology for providing us with relevant thermodynamic-property information for the evaluation of the NE pressures. In addition, J.O.Z. acknowledges support from the UCM/Santander Research Grant No. PR6/13-18867.

Uncontrolled Keywords:Asymptotic time behavior; Transport-coefficients; Light-scattering; Convective instability; Diffusion-coefficient; Burnett coefficients; Nonlinear transport; Rayleigh-scattering; Giant fluctuations; Polymer-solution
Subjects:Sciences > Physics > Thermodynamics
ID Code:27257
Deposited On:05 Nov 2014 09:03
Last Modified:26 Feb 2015 15:20

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