Abdalaziz Elhaj Bakhit Elkhwad2017-08-012017-08-012015http://hdl.handle.net/123456789/4508Abstract In this thesis we study the effect of radiation on the boundary layer flow and heat transfer of viscous fluid. The Spectral Homtopy Perturbation Method (S-HPM) used to solve the system of the governing equations. We also determine the convergent series of the solution. The accuracy and rate of convergence of the solution has been tested and compared for different orders and the results are presented in tables . The physical interpretation to these expressions is assigned through graphs.الرياضياتsystem of the governing equationseffect of radiation