DOUBLE DIFFUSIVE FREE CONVECTION ALONG A VERTICAL SURFACE IN A DOUBLY STRATIFIED POROUS MEDIUM WITH SORET AND DUFOUR EFFECTS UNDER MHD FORCES

2017 ◽  
Vol 20 (10) ◽  
pp. 865-879
Author(s):  
S.V.S.S.N.V.G. Krishna Murthy ◽  
Frédéric Magoulès ◽  
B. V. Rathish Kumar ◽  
Vinay Kumar
Keyword(s):  
Porous Medium ◽  
Free Convection ◽  
Vertical Surface ◽  
Soret And Dufour Effects ◽  
Double Diffusive

A Study of Double Diffusive Free Convection From a Corrugated Vertical Surface in a Darcy Porous Medium Under Soret and Dufour effects

2011 ◽  
Vol 133 (9) ◽  
Author(s):  
S.V.S.S.N.V.G. Krishna Murthy ◽  
B.V. Rathish Kumar ◽  
Peeyush Chandra ◽  
Vivek Sangwan ◽  
Mohit Nigam
Keyword(s):  
Boundary Layer ◽  
Porous Medium ◽  
Free Convection ◽  
Nonlinear Partial Differential Equations ◽  
Lewis Number ◽  
Boussinesq Approximation ◽  
Vertical Surface ◽  
Soret And Dufour Effects ◽  
Boundary Layer Equations ◽  
Double Diffusive

This study examines the influence of Soret and Dufour effects on double diffusive free convection due to wavy vertical surface immersed in a fluid saturated semi-infinite porous medium under Darcian assumptions. A wavy to flat surface transformation is applied, and the resulting coupled nonlinear partial differential equations under Boussinesq approximation are reduced to boundary layer equations. A finite difference scheme based on the Keller-Box approach has been used in conjunction with block-tridiagonal solver for obtaining the solution for boundary layer equations. Results from the current study are compared with those available in literature. The effect of various parameters such as wave amplitude (a), Lewis number (Le), buoyancy ratio (B), and Soret (Sr) and Dufour (Df) numbers are analyzed through local and average Nusselt number, and local and average Sherwood number plots.

Effect of Double Stratification on Free Convection in a Darcian Porous Medium

2004 ◽  
Vol 126 (2) ◽  
pp. 297-300 ◽  
Author(s):  
P. V. S. N. Murthy ◽  
D. Srinivasacharya and ◽  
P. V. S. S. S. R. Krishna
Keyword(s):  
Porous Medium ◽  
Free Convection ◽  
Vertical Surface ◽  
Function Form ◽  
Double Stratification ◽  
Flow Temperature ◽  
Complex Interactions ◽  
Free Convection Heat ◽  
Buoyancy Ratio ◽  
Darcy Rayleigh Number

The problem of free convection heat and mass transfer from vertical surface embedded in a doubly stratified porous medium has been studied. The similarity solution is presented for the case of uniform heat and mass flux conditions when the thermal and solutal stratification of the medium are assumed to have the power function form x1/3. The flow, temperature and concentration fields are effected by the complex interactions among the diffusion ratio parameter Le and buoyancy ratio parameter N in addition to the flow driving Darcy-Rayleigh number Rax. The temperature and concentration profiles are effected due to double stratification of the medium and its effect on the Nusselt and Sherwood numbers is discussed.

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