Soret and Dufour Effects on Free Convection Heat and Mass Transfer From a Horizontal Flat Plate in a Darcy Porous Medium

2008 ◽  
Vol 130 (10) ◽  
Author(s):  
P. A. Lakshmi Narayana ◽  
P. V. S. N. Murthy
Keyword(s):  
Mass Transfer ◽  
Porous Medium ◽  
Free Convection ◽  
Flat Plate ◽  
Heat And Mass Transfer ◽  
Similarity Solution ◽  
Convective Transport ◽  
Coupled Systems ◽  
Solution Technique ◽  
Soret And Dufour Effects

The effect of Soret and Dufour parameters on free convection from a horizontal flat plate in a Darcian fluid saturated porous medium is analyzed using the similarity solution technique. With constant wall temperature and concentration, the similarity solution is possible even when Soret and Dufour effects are considered in the medium. The transformed coupled systems of ordinary differential equations involve parameters such as the buoyancy ratio parameter N and diffusivity ratio Le in addition to the Soret Sr and Dufour Df parameters. The effect of all these parameters on the convective transport has been analyzed, and the variation of heat and mass transfer coefficients with Dufour and Soret parameters is presented through computer generated graphs.

Soret and Dufour Effects in a Non-Darcy Porous Medium

2005 ◽  
Vol 128 (6) ◽  
pp. 605-610 ◽  
Author(s):  
M. K. Partha ◽  
P. V. S. N. Murthy ◽  
G. P. Raja Sekhar
Keyword(s):  
Mass Transfer ◽  
Porous Medium ◽  
Heat And Mass Transfer ◽  
Saturated Porous Medium ◽  
Lewis Number ◽  
Solution Technique ◽  
Transfer Coefficients ◽  
Dispersion Parameters ◽  
Soret And Dufour Effects ◽  
Mass Transfer Coefficients

The effect of double dispersion on free convection heat and mass transfer from a vertical surface embedded in a non-Darcy electrically conducting fluid saturated porous medium with Soret and Dufour effects is studied using similarity solution technique. The heat and mass transfer coefficients are effected greatly due to these secondary effects and also due to the complex interaction among the dispersion parameters Raγ,Raξ, and Lewis number Le and buoyancy ratio N. In both aiding and opposing buoyancies, Df and Sr have significant influence on the Nusselt and Sherwood numbers in the presence and absence of thermal and solutal dispersion in the medium. It is also observed that the magnetic field parameter lowered heat and mass transfer coefficients. The results are presented through comparison tables and plots.

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