Mutual and self-diffusion in fluids undergoing strong shear

Sten Sarman, Denis J. Evans, Andras Baranyai

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

We derive a Green-Kubo relation for the mutual diffusion tensor (MDT) of a binary fluid mixture subject to a strong Couette shear field. We calculate the MDT of a Lennard-Jones (LJ) mixture and the self-diffusion tensor (SDT) of a pure LJ fluid as functions of state point and strain rate. The qualitative dependence of the diffusion tensors upon these variables is explained in greater detail by analyzing the velocity and mass current autocorrelation functions. Finally, we compare the zero-color field color conductivity with the SDT. For nonzero shear rates we find that the color conductivity and the SDT are different, confirming the prediction by Evans, Baranyai, and Sarman [Mol. Phys. (to be published)], according to which these two transport coefficients should only be related at zero shear rate.

Original languageEnglish
Pages (from-to)893-902
Number of pages10
JournalPhysical Review A
Volume46
Issue number2
DOIs
Publication statusPublished - Jan 1 1992

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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