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Mass transport in porous materials under combined gradients of composition and pressure
Author(s) -
Gunn Robert D.,
King C. Judson
Publication year - 1969
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.690150409
Subject(s) - permeation , porous medium , isobaric process , diffusion , porosity , chemistry , thermodynamics , capillary action , diaphragm (acoustics) , partial pressure , mass transport , mole fraction , conservation of mass , mass fraction , analytical chemistry (journal) , chromatography , membrane , oxygen , organic chemistry , physics , biochemistry , engineering physics , acoustics , loudspeaker
An expression is derived for the analysis of gas‐phase mass transport in porous media in the presence of gradients in pressure and mole fraction. The behavior of porous media is contrasted with that of capillary tubes. A continuous‐flow diffusion and permeation apparatus was employed for studies of mass transport in a fritted glass diaphragm. Measurements were obtained at varying levels of pressure and cover both isobaric binary diffusion and the permeation of pure gases and gas mixtures. These experimental results and previous data obtained by Hewitt and Sharratt and by Mason, et al. bear out the form of the equation and successfully provide independent checks of the three constants necessary to characterize a given porous medium.