Compared to base fluid,nanofluids significantly increase thermal conductivity and therefore have potential applications in many heat transfer areas.The effects of thermophysical properties and thermal dispersion on the convective heat transfer coefficients of nanofluids were investigated.The simulation results show that the thermal conductivity of nanofluids is enhanced with the addition of nanopaticles into the base fluid.The collisions between nanoparticles,fluid molecules,and the wall of flow wall are intensified,leading to enhanced mixing agitation and turbulence.Improved thermophysical properties and thermal dispersion result in the convective heat transfer coefficient enhancement of nanofluids.The calculation results also reveal that the effect of the heat transfer enhancement of the nanofluids is related to the volume fraction and Reynolds number.