A simplified description of multicomponent diffusion in porous media. II. Conditions for negligible forced flow effects

1979 ◽  
Vol 44 (2) ◽  
pp. 465-474 ◽  
Author(s):  
Marta Černá ◽  
Jindřich Zahradník ◽  
Petr Schneider
Keyword(s):  
Porous Media ◽  
Pressure Gradient ◽  
Chemical Reaction ◽  
Multicomponent Diffusion ◽  
Forced Flow ◽  
Gas Mixture ◽  
Porous Catalyst ◽  
Diffusion In Porous Media ◽  
Flow Effects

Conditions are examined permitting the pressure gradient in a porous catalyst sustaining multicomponent diffusion of a gas mixture accompanied by chemical reaction to be neglected. Deviations are computed of the sum of mole fractions from unity for selected typical cases as a measure of error commited by neglecting the forced flow.

scholarly journals Anomalous diffusion in porous media

2016 ◽  
Vol 40 (3) ◽  
pp. 1850-1862 ◽  
Author(s):  
J.A. Ferreira ◽  
G. Pena ◽  
G. Romanazzi
Keyword(s):  
Porous Media ◽  
Anomalous Diffusion ◽  
Diffusion In Porous Media

Numerical Analysis of Thermal-Solutal Convection in Heterogeneous Porous Media

2005 ◽  
Vol 73 (1) ◽  
pp. 21-25 ◽  
Author(s):  
Charles-Guobing Jiang ◽  
M. Ziad Saghir ◽  
M. Kawaji
Keyword(s):  
Porous Media ◽  
Thermal Diffusion ◽  
Soret Effect ◽  
Heterogeneous Porous Media ◽  
Soret Coefficient ◽  
Solutal Convection ◽  
Coefficient Distribution ◽  
Separation Ratio ◽  
Diffusion In Porous Media ◽  
Vertical Cavity

Thermal diffusion, or Soret effect, in porous media is mathematically modeled with the Firoozabadi model based on non-equilibrium thermodynamics. The Soret effect in a binary mixture is investigated in a vertical cavity with heterogeneous permeability, where natural convection can occur. The thermo solutal convection with heterogeneous permeability was studied in terms of flow pattern, concentration distribution, component separation ratio, and Soret coefficient distribution. A consistent analysis was conducted and it is concluded that the Soret coefficient of thermal diffusion in porous media strongly depends on the heterogeneity of permeability.

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