Thermal Stability of Binary Gas Mixtures in a Porous Medium

[+] Author and Article Information
M. L. Lawson

Mechanical Engineering Department, Ahmadu Bello University, Zaria, Nigeria

Wen-Jei Yang

Mechanical Engineering Department, The University of Michigan, Ann Arbor, Mich.

J. Heat Transfer 97(3), 378-381 (Aug 01, 1975) (4 pages) doi:10.1115/1.3450382 History: Received February 20, 1974; Online August 11, 2010


Thermal instability of a thin horizontal layer of binary gas mixture subject to an adverse temperature gradient in a porous medium is experimentally determined by applying the Schmidt-Milverton principle for detecting the onset of convective currents. The binary gas mixture consists of helium and nitrogen gases at various composition, while a packed bed of tiny steel balls constitutes the porous medium. It is disclosed that the critical Rayleigh number for pure gas is lowered by the presence of another species of different molecular weight and has a minimum value at a certain composition of the binary mixture.

Copyright © 1975 by ASME
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