In this study, the flow field and heat transfer of Al2O3-water nanofluid turbulent forced convection in a tube is investigated. The surface of the tube is hot (Th=310 K). Simulations is carried out for constant water Prandtl number of 6.13, Reynolds numbers of 10000, 20000, 30000 to 100000, nanoparticles volume fractions of 0, 0.001, 0.1, 0.2, 0.4 and nanoparticles’ diameter 25, 33, 75, 100 nanometer. The finite volume method and SIMPLE algorithm is utilized to solve the governing equations numerically. The numerical results showed that with enhancing Reynolds numbers, average Nusselt number increases. The variations of the average Nusselt number relative to volume fractions are not uniform. For all of the considered volume fractions, by increasing the Reynolds number the skin friction factor decreases and with increasing volume fractions and Reynolds number the pressure drop increases.
