Diffusive transport by thermal velocity fluctuations

Aleksandar Donev, John B. Bell, Anton De La Fuente, Alejandro L. Garcia

Research output: Contribution to journalArticlepeer-review

Abstract

We study the contribution of advection by thermal velocity fluctuations to the effective diffusion coefficient in a mixture of two identical fluids. We find good agreement between a simple fluctuating hydrodynamics theory and particle and finite-volume simulations. The enhancement of the diffusive transport depends on the system size L and grows as ln(L/L0) in quasi-two-dimensional systems, while in three dimensions it scales as L0-1-L-1, where L0 is a reference length. Our results demonstrate that fluctuations play an important role in the hydrodynamics of small-scale systems.

Original languageEnglish (US)
Article number204501
JournalPhysical Review Letters
Volume106
Issue number20
DOIs
StatePublished - May 16 2011

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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