Kinetic Model of Fluids Molecules Diffusion in Porous Media

2011 ◽  
Vol 6 (4) ◽  
pp. 89-94
Author(s):  
Vladimir Andryushchenko ◽  
Valeriy Rudyak
Keyword(s):  
Porous Media ◽  
Diffusion Coefficients ◽  
Fluid Density ◽  
Dynamics Modeling ◽  
Molecular Fluids ◽  
Self Diffusion ◽  
Molecular Dynamics Modeling ◽  
Diffusion In Porous Media ◽  
Modeling Data ◽  
And Diffusion

Model of molecular fluids diffusion in porous media develop on the base of elementary kinetic theory. The dependence of self-diffusion and diffusion coefficients from pore sizes, porosity, and fluid density has been obtained. The predictions of created model have been compared with molecular dynamics modeling data

Solution and Diffusion in Silicone Rubber. I. A Comparison with Natural Rubber

1963 ◽  
Vol 36 (3) ◽  
pp. 642-650 ◽  
Author(s):  
R. M. Barrer ◽  
J. A. Barrie ◽  
N. K. Raman
Keyword(s):  
Statistical Theory ◽  
Natural Rubber ◽  
Silicone Rubber ◽  
Diffusion Coefficients ◽  
Molecular Size ◽  
Low Energy ◽  
Kcal Mole ◽  
Self Diffusion ◽  
Order Of Magnitude ◽  
And Diffusion

Abstract The diffusion and solubility of n- and isobutane and of n- and neopentane has been studied in the range 30° to 70° C, in polydimethylsiloxane rubbers. The solubilities are very similar to those in natural rubbers and show comparable agreement with the statistical theory of polymer penetrant mixtures. Diffusion coefficients are at least an order of magnitude greater in silicone than in natural rubbers. The very low energy of activation, ED, of about 4 kcal/mole is almost invariant among the hydrocarbons studied and is the same as for self-diffusion and viscous flow in this rubber. The low value of ED means that permeabilities of the hydrocarbons increase as the temperature falls. Because diffusion in silicones is less dependent upon molecular size and shape of penetrant than in natural rubber, the silicones are less selective though much more permeable separation barriers.

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