In this study laminar convective heat transfer for CuO/water nanofluid, which is a suspension of CuO nanoparticles in water in a circular tube with constant wall temperature boundary condition was investigated experimentally. The heat transfer coefficients for different volume fractions of solids at various Peclet numbers were experimentally determined. Also the viscosity of nanofluids was measured and compared with theoretical model predictions. Both theoretical and experimental results represent that heat transfer coefficients increase by nanoparticle concentration as well as Peclet number. But the experimental results are greater than the values obtained by homogeneous model with nanofluids physical and thermal properties.

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