Evaluation of diffusion coefficients in multicomponent mixtures by means of the fluctuation theory

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We derive general expressions for diffusion coefficients in multicomponent non-ideal gas or liquid mixtures. The derivation is based on the general statistical theory of fluctuations around an equilibrium state. The matrix of diffusion coefficients is expressed in terms of the equilibrium thermodynamic characteristics of the mixture (such as molar densities and internal energy), as well as in terms of the newly introduced parameters, the penetration lengths. This result serves to reduce the problem of determining the diffusion coefficients to a smaller number of physically meaningful characteristics. We demonstrate on several examples that the developed theory is in agreement with the established experimental facts and dependencies for the diffusion coefficients. (C) 2002 Elsevier Science B.V. All rights reserved.
Original languageEnglish
JournalPhysica A: Statistical Mechanics and its Applications
Volume320
Pages (from-to)211-234
ISSN0378-4371
Publication statusPublished - 2003

Fingerprint

Dive into the research topics of 'Evaluation of diffusion coefficients in multicomponent mixtures by means of the fluctuation theory'. Together they form a unique fingerprint.

Cite this