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THERMODIFFUSION IN CAVITY FILLED WITH A BINARY MIXTURE

DOI: 10.1615/ICHMT.2009.CONV.770
9 pages

Mohammad Azizur Rahman
Mushroom Research Centre, Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia; Department of Biochemistry and Molecular Biology, Jahangirnagar University, Savar, Dhaka, Bangladesh

M. Ziad Saghir
Department of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria St., Toronto, ON M5B2K3, Canada

Résumé

In this paper, the onset of thermo-solutal convection in a liquid layer overlying a porous layer has been studied, where the whole system being laterally heated. The non-linear two-dimensional Navier Stokes equations, the energy equation, continuity equation, and the mass balance equation are solved for the liquid layer. The modified Brinkman model is taken into consideration for the porous layer. The partial differential equations are solved numerically using the finite element technique. The thermo-solutal convection in the presence of thermodiffusion or Soret effect is studied in details. Three different cases will be investigated, case 1 the system is a porous cavity filled with liquid, case 2 the system is a non porous cavity and thirdly the system is a liquid layer overlying a porous layer. It is shown that at low gravity, separation occurs in the absence of buoyancy. In the presence of buoyancy, mixing occurs into the cavity and no separation exists.

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