HEAT TRANSFER ENHANCEMENT WITH Al_2O_3 NANOFLUID IN CONVECTIVE HEAT TRANSFER

摘要

Convective heat transfer characteristics of Al_2O_3 rianoparticles suspended in water are studied using different volume concentrations. An experimental facility was used to perform experiments at mass fluxes from 200 to 1000 kg/m~2-s, heat fluxes from 0.1 to 0.5 MW/m~2 and percentage Al_2O_3 volume fraction up to 1% at a pressure of 1 bar in an annular test section with an inner heating surface of hollow stainless steel. The addition of nanoparticles in water enhances heat transfer coefficient and the enhancement increases with increase in the nanoparticle concentration and flow rate.