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Diffusion in three‐component gas mixtures
Author(s) -
Toor H. L.
Publication year - 1957
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690030214
Subject(s) - diffusion , component (thermodynamics) , thermodynamics , chemistry , molecular diffusion , concentration gradient , countercurrent exchange , diffusion equation , diffusion process , chromatography , physics , metric (unit) , knowledge management , operations management , economy , innovation diffusion , computer science , economics , service (business)
A solution to the Stefan‐Maxwell diffusion equations for equimolal countercurrent diffusion in a three‐component gas mixture is obtained which is similar in form to Gilliland's equation for diffusion of two gases through a third inert gas. The important features of both types of diffusion are investigated and the conditions under which the following phenomena occur are determined: (1) diffusion barrier (the rate of diffusion of a component is zero even though its concentration gradient is not zero); (2) osmotic diffusion (the rate of diffusion of a component is not zero even though its concentration gradient is zero); (3) reverse diffusion (a component diffuses against the gradient of its concentration). A generalized driving force which describes these phenomena is introduced, and approximate equations are developed which give the individual rates of diffusion directly.