Convective heat transfer of nanofluid which is a suspension of nanoparticles added to water through circular tube was investigated experimentally. Flow was laminar and constant wall temperature was used as thermal boundary condition. It is found that heat transfer coefficients increase by nanoparticles concentration as well as Peclet number. Measured heat transfer coefficients were greater than the values predicted by single phase heat transfer correlation with nanofluids physical and thermal properties. Also experimental results show Newtonian behavior for nanofluid at concentration up to volume fraction.

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