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Physical origin of nonequilibrium fluctuation-induced forces in fluids

T. R. Kirkpatrick, J. M. Ortiz de Zárate, and J. V. Sengers
Phys. Rev. E 93, 012148 – Published 27 January 2016

Abstract

Long-range thermal fluctuations appear in fluids in nonequilibrium states leading to fluctuation-induced Casimir-like forces. Two distinct mechanisms have been identified for the origin of the long-range nonequilibrium fluctuations in fluids subjected to a temperature or concentration gradient. One is a coupling between the heat or mass-diffusion mode with a viscous mode in fluids subjected to a temperature or concentration gradient. Another one is the spatial inhomogeneity of thermal noise in the presence of a gradient. We show that in fluids fluctuation-induced forces arising from mode coupling are several orders of magnitude larger than those from inhomogeneous noise.

  • Received 13 November 2015

DOI:https://doi.org/10.1103/PhysRevE.93.012148

©2016 American Physical Society

Physics Subject Headings (PhySH)

Statistical Physics & Thermodynamics

Authors & Affiliations

T. R. Kirkpatrick1,2,*, J. M. Ortiz de Zárate3, and J. V. Sengers1

  • 1Institute for Physical Science and Technology, University of Maryland, College Park, Maryland 20742, USA
  • 2Department of Physics, University of Maryland, College Park, Maryland 20742, USA
  • 3Departamento de Física Aplicada I, Facultad de Física, Universidad Complutense, 28040 Madrid, Spain

  • *tedkirkp@umd.edu

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Issue

Vol. 93, Iss. 1 — January 2016

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