Heat and mass transfer in composite fluid-porous layer : Effect of permeability

الملخص EN

Numerical simulations are conducted for two-dimensional, steady state, double diffusive flow in a composite fluid-porous layer.

Both the temperature and solute gradients are imposed horizontally, and the two buoyancy effects can either augment or counteract each other.

The porous medium is modeled according to the Darcy-Brinkman and Forchheimer model, and the SIM?L£R algorithm, based on the finite volume approach, is used to solve the pressure-velocity coupling.

An extensive series of numertcal simulations is conducted in the range: 103 < Gr < 106 , 10~8 < Da < 1, -20

It is shown that the main effect of the presence of the porous layer is to reduce the heat and mass transfer when the permeability is reduced.

With appropriate combination of Grashof number, Lewis number, and the buoyancy ratio, multiple cell flow patterns are illustrated.