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Year 2007, Volume 10 / Issue 6

DOI: 10.1615/JPorMedia.v10.i6

Pages: 103

DOI: 10.1615/JPorMedia.v10.i6.70

Article price - $35.00

Soret and Dufour Effects on Free Convection Heat and Mass Transfer in a Doubly Stratified Darcy Porous Medium

P. A. Lakshmi Narayana
Department of Mathematics, Indian Institute of Technology, Kharagpur 721 302, India

P. V. S. N. Murthy
Department of Mathematics, Indian Institute of Technology, Kharagpur, West Bengal, 721302, India

Free convection heat and mass transfer from a vertical surface in a doubly stratified Darcy porous medium subject to Soret and Dufour effects is studied. The similarity solution is possible for the case of constant heat and mass flux conditions, when the thermal and solutal stratification of the medium are assumed to vary in the power function as x^1/3. The flow, temperature, and concentration fields are affected by the complex interactions among the diffusivity ratio Le, buoyancy ratio parameter N, Soret number S_r, Dufour number D_f, and the thermal and solutal stratification parameters ε₁ and ε₂, respectively. The results for the wall temperature and concentration obtained are presented for various values of the parameters Le, N, ε₁, ε₂, S_r, and D_f. It is noted that large differences between the values of S_r and D_f, and of ε₁ and ε₂, lead to changes in the sign of the temperature and concentration fields.

pages 613-624

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