Gaseous mass transport in porous media through a stagnant gas

Journal Article · Thu Jan 01 04:00:00 EST 1987 · Ind. Eng. Chem. Res.; (United States)

DOI:https://doi.org/10.1021/ie00061a013· OSTI ID:6227137

Unal, A

An analysis is presented for gas-phase mass transport in porous media through a stagnant gas. The natural flux ratio rule for isobaric conditions, which requires that the fluxes be inversely proportional to the square roots of the molecular weights, is not met in this system. Accordingly, a pressure difference develops and this superimposes viscous flow upon diffusion. Equations are derived for the flux and the pressure difference, and it is shown that even when the pressure difference is small, the contribution of viscous flow to the flux can be considerable. Flux and pressure difference measurements carried out on the transport of carbon dioxide through stagnant nitrogen in a septum of coarse pores (average pore size 2.5 ..mu..m) are in agreement, within experimental error, with those predicted by the equations.

• Research Organization: Dept. of Metallurgy and Materials Science, Imperial College of Science and Technology, London SW7 2BP
• OSTI ID: 6227137
• Journal Information: Ind. Eng. Chem. Res.; (United States), Journal Name: Ind. Eng. Chem. Res.; (United States) Vol. 26:1; ISSN IECRE
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
DIFFUSION
ELEMENTS
EQUATIONS
FLOW MODELS
FLUID FLOW
GAS FLOW
MASS TRANSFER
MATERIALS
MATHEMATICAL MODELS
MOLECULAR WEIGHT
NITROGEN
NONMETALS
OXIDES
OXYGEN COMPOUNDS
POROUS MATERIALS
PRESSURE GRADIENTS
VISCOUS FLOW