Nanofluids have been employed to enhance heat transfer rate in various applications. In this work turbulent flow forced convection heat transfer of Al2O3-water and TiO2-water nanofluid inside a circular tube with constant heat flux was investigated numerically. CFD simulation by FLUENT software was performed at different base temperatures (25, 50 and 70 °C), different nanoparticle concentrations (1% and 2%) and Reynolds numbers (104 < Re < 105) as well as size diameters assumed to be constant 13 nm and 27nm respectively. The friction factor and heat transfer coefficient of nanofluids were obtained for two nanofluids. Results of CFD simulation emphasize the enhancement of heat transfer due to the nanoparticles presence in the fluid. The enhancements of heat transfer are 17% and 29% with Al2O3 but 11% and 19% with TiO2 nanoparticles. Heat transfer coefficient increases by increasing the concentration of nanoparticles in nanofluid. There is no effect of base temperature on friction factor but increasing in base temperature is led to increase in the heat transfer coefficient. The results show that good agreement with experimental data available in literature.

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