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Soret-driven convection in horizontal annular porous cavity

The Soret-driven convection in a porous annular cavity filled with a binary fluid and submitted to constant and uniform temperature on the inner and outer walls is investigated. The dimensionless governing equations are solved with Alternating Direction Implicit (ADI) scheme basing on the discretization using the centered Finite-Difference. Two large ranges of cooperating and opposite buoyancy forces are considered. The analysis focuses on the onset and development of the multicellular flows under increasing Soret coefficient. The computation results show that different transitions from unicellular to multicellular flow could occur depending on the buoyancy ratio and Soret coefficient values. On the other hand, the average heat and mass transfer rates behaviors are carried out and discussed.