Heat and mass transfer for Soret and Dufour's effects on Hiemenz flow through porous medium onto a stretching surface

A theoretical study of the steady stagnation point flow over a flat stretching surface in the presence of species concentration and mass diffusion under Soret and Dufour's effects has been obtained by solving the governing equations of continuity, momentum, energy and concentration using similarity analysis and numerical technique. Results showed that the fields were influenced appreciably by the effects of exothermic or enclothermic chemical reaction. stretching parameter and radiation, etc. It was evident that for some kinds of mixtures with the light and medium molecular weight. the Soret and Dufour's effects should be considered as well. (C) 2008 Elsevier Ltd. All rights reserved.