Mohammad Reza Golbahar

The ?uid ?ow and heat transfer characteristics of laminar nano?uid ?ow in microchan- nel heat sink (MCHS) with V-Type inlet/outlet arrangement are numerically studied. A constant heat ?ux boundary condition is applied on the base plate of MCHS and all the other surfaces of MCHS are insulated. Four different kinds of nano?uids are utilized as working ?uids which are SiO2,Al2O3, ZnO and CuO dispersed in pure water as a base ?uid. Three different volume fractions of 1%, 1.5% and 2% and three distinctive nanoparticle diameters of 30 nm, 40 nm and 60 nm were employed. The results specify that the SiO2 nano?uid has the uppermost heat transfer rate com- pared to other tested nano?uids. Increasing the nanoparticles volume fraction together with decreasing the nanoparticles diameter enhances the Nusselt number value. The pressure drop coef- ?cient did not change signi?cantly by using nano?uid with various volume fractions and varied nanoparticle diameters. Moreover, the results indicate that nano?uid can enhance the performance of MCHS with V-shaped inlet/outlet arrangement.