Nanofluids refer to a new kind of heat transfer fluids with suspended nanoparticles and can be employed to increase heat transfer rate in various applications. In this investigation laminar convective heat transfer of three series of metallic and non-metallic nanofluids through circular tube under constant wall temperature boundary condition investigated experimentally. The heat transfer coefficients for different concentration of , 3 2O Al CuO and Cu nanoparticles at various Peclet numbers were determined. The experimental results emphasize on the enhancement of heat transfer by increasing the concentration of nanoparticles as well as Peclet number for each nanofluid but measured results are greater than the values predicted by theoretical correlations.

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