In this investigation convective heat transfer of two series of oxide nanofluids including and were studied experimentally. The flow was laminar and constant wall temperature was used as thermal boundary condition. The heat transfer coefficients for different concentration of and nanoparticles at various Peclet numbers were experimentally determined. Also the viscosity of nanofluids was measured and compared with theoretical model predictions. Experimental results emphasize on the enhancement of heat transfer, which is due to the existence of the nanoparticles in the fluid. Heat transfer coefficient enhances by increasing the concentration of nanoparticles as well as Peclet number of nanofluid.

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