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Periodic capillary models of diffusion in porous solids

✍ Scribed by G.R. Gavalas; S. Kim

Publisher
Elsevier Science
Year
1981
Tongue
English
Weight
1003 KB
Volume
36
Category
Article
ISSN
0009-2509

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✦ Synopsis

Periodic capillary networks are proposed as models for describing diffusion in porous solids. The capillary network is analyzed by means of the nodal concentration equations for a single unit cell and expressions are derived for the diffusional flux in terms of the macroscopic concentration gradient. Conditions for isotropy are derived and the validity of the smooth field assumption is discussed. The theory is illustrated with a macroporemicropore model of porous catalyst pellets and comparisons are made with an earlier capillary model.

πŸ“œ SIMILAR VOLUMES

Diffusion of ideal gases in capillaries
Diffusion of ideal gases in capillaries and porous solids
✍ D. S. Scott; F. A. L. Dullien πŸ“‚ Article πŸ“… 1962 πŸ› American Institute of Chemical Engineers 🌐 English βš– 614 KB

The steady state diffusion of gases through capillaries or through the pores of a solid when fusion, bulk flow of the gases is free to the total pressure in the system is constant is considered. I t is shown that the ratio of the molar occur, but in the present situation diffusion rate of the lighte