摘要 : Natural convection in a rectangular cavity with a saturated porous layer on one of its vertical walls is studied numerically The governing equations using the Boussinesq approximation for the treatment of buoyancy term in the mome... 展开 Natural convection in a rectangular cavity with a saturated porous layer on one of its vertical walls is studied numerically The governing equations using the Boussinesq approximation for the treatment of buoyancy term in the momentum equation and the Darcy model are expressed using the vorticity-stream function approach These equations are discretized with the implicit finite-difference method. Thomas algorithm and Gauss-Seidel method are used to solve the resultant algebraic system equations. Results are presented in terms of streamlines, isotherms and isoconcentrations. The increase of the porous wall permeability leads to a more intensive buoyancy-driven flow through the porous wall and consequently an increase of heat and mass transfer occurs in the enclosure. Nusselt and Sherwood numbers are expressed as functions of dimensionless parameters as Darcy number, modified Grashof number and the geometric aspect ratio of the enclosure. 收起