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An analytical study is performed to explore the flow and heat transfer characteristics of nano fluid (Al2O3-water and TiO3-water) over a linearly stretching porous sheet in the presence of radiation, ohmic heating and viscous dissipation. Homotopy perturbed method is used and complete solution is presented, the results for the nanofluids velocity and temperature are obtained. The effects of various thermophysical parameters on the boundary layer flow characteristics are displayed graphically and discussed quantitatively. The effect of viscous dissipation on the thermal boundary layer is seen to be reverse after a fixed distance from the wall, which is very strange in nature and is the result of a reverse flow. The finding of this paper are unique and may be useful for future research on nanofluid.
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