Radiation effect on mixed convection over an isothermal cone in porous media

The radiation effect on the mixed convection flow of an optically dense vis cous fluid adjacent to an isothermal cone embedded in a saturated porous me dium with Rosseland diffusion approximation is numerically investigated. Th e entire regime of the mixed convection is included, as the mixed convectio n parameter of chi varies from 0 (pure free convection) to 1 (pure forced c onvection). The transformed nonlinear system of equations is solved by usin g an implicit finite difference method. Numerical results are given for the dimensionless temperature profiles and the local Nusselt number for variou s values of the mixed convection parameter chi, the cone angle parameter m, the radiation-conduction parameter R-d and the surface temperature paramet er H. The local Nusselt number decreases initially, reaches a minimum in th e intermediate value of chi and then increases gradually. It is apparent th at increasing the cone angle parameter in enhances the local Nusselt number . The local Nusselt number is significantly increased for the large values of the radiation-conduction parameter R-d and the surface temperature param eter H, i.e., radiation effect becomes pronounced.