a Fattahi - Department of Mechanical Engineering, University of Kashan, Kashan, Iran

Heat exchangers are very important equipment for cooling and heating processes in different industrial fields and applications. Nanofluids were employed to replace conventional working fluids of the same kind as water, ethyl-glycol and oil, with the aim to improve the heat transfer performance of heat exchange device. In this paper, numerical simulation of laminar flow and heat transfer of nanofluid on a shell and tube heat exchanger is described. To achieve this aim, heat transfer and laminar flow of nanofluid as cooling fluid at volume fraction of 0, 3, and 6% solid nanoparticles of Al2O3 and Reynolds numbers of 100 to 700 were investigated. Analyzing the results of numerical simulations indicates that with increasing Reynolds number, maximum temperature decreases in the shell and tube exchangers. Also the results show with the increase in Reynolds number, friction factor declines. Heat transfer increases by increasing volume fraction and Reynolds-

Shell and tube heat exchanger, Nanofluid, Heat transfer, Convection, Pressure drop.