RADIATION EFFECT ON DARCY FREE-CONVECTION FLOW ALONG AN INCLINED SURFACE PLACED IN POROUS-MEDIA

The paper investigates the effect of radiation on Darcy's buoyancy ind uced flow of an optically dense viscous incompressible fluid along a h eated inclined flat surface maintained at uniform temperature placed i n a saturated porous medium with Rosseland diffusion approximation emp loying the implicit finite difference method together with Keller box elimination technique. Both the streamwise and normal components of th e buoyancy force are retained in the momentum equations. The numerical results show that as the buoyancy parameter, xi, increases the local Nusselt number increases. The results for the locally nonsimilar solut ions are compared with the locally similar solutions for small angle o f inclination and approximate similar solutions along vertical surface . The effect of the conduction-radiation parameter, R-d, and the surfa ce temperature excess ration, theta(w), on the local Nusselt number, t he tangential velocity distribution and the temperature distribution a re also shown graphically.