Composite heat transfer in a variable porosity medium bounded by an infinite flat plate

摘要: Heat transfer by simultaneous radiation and convection in a variable porosity medium bounded an infinite flat plate is determined solving momentum energy equations. The problem investigated for two different cases, viz., presence of porous absence medium. In the both constant situations are studied. Similarity solutions obtained isothermal impermeable wall. Kozeny-Blake expression connecting permeability incorporated analysis unified treatment. A parameter survey made to study effect optical thickness, parameter, albedo scattering ratio conduction using Runge-Kutta-Gill method. heating cooling cases considered situation. results show that convective radiative components decrease with increase inhomogeneity enhances heat rate. thickness leads fluxes. For particular value wall emissivity (e w =0.5932116) flux reduced zero.