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A note on multicomponent diffusion

✍ Scribed by Stephen A. Shain

Publisher
American Institute of Chemical Engineers
Year
1961
Tongue
English
Weight
355 KB
Volume
7
Category
Article
ISSN
0001-1541

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✦ Synopsis

Abstract

The problem of defining an average diffusion coefficient of a gas arises in the application of the film resistance model for mass transfer to systems involving multicomponent mixtures of simultaneously diffusing gases and in the application of mass, momentum, and heat transfer analogies in such systems. It is shown that, in some cases, integration of the diffusion equation with an average value of the diffusion coefficient will not be valid. An approximate solution of the diffusion equation is obtained with the concentration dependence of the diffusion coefficient taken into account. Some numerical examples are constructed for comparison of this method and several methods for defining an average diffusion coefficient with an exact solution of the Stefan‐Maxwell relations.

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