Comparison Of Mass Fluxes Predicted By The Dusty-gas And A Modified Dusty-gas Model


The equations of the dusty-gas model (homoporous model) are modified through the use of correction factors which account for the effects the pore-size and tortuosity distributions have on the mass fluxes in heteroporous media. When the correction factors approach unity, the modified dusty-gas model approaches the behavior of the dusty-gas equations; this occurs when the pressure of the system is either very low or very high because, at either extreme, almost all pores in a porous medium are in a single transport regime, that is either Knudsen or molecular diffusion. A comparison of the mass fluxes predicted by the modified dusty-gas (heteroporous model) and the dusty-gas models for binary isobaric diffusion and simultaneous flow and diffusion, shows that the percentage deviation between NiMDG and NiDG. (i species A or B) may be, in some cases, significant (up to 75% for the porous media studied in this work); this indicates that the dusty-gas model (homoporous model) could fail in predicting accurately the mass fluxes in porous media with wide pore-size distributions. The percentage deviation in the mass fluxes becomes smaller as the pressure increases above certain values at which the deviation of the correction factors from unity is small. © 1982.


Chemical and Biochemical Engineering


University of Missouri, Grant None

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Article - Journal

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Publication Date

01 Jan 1982