انتقال حرارت جابجایی اجباری و رفتار هیدرودینامیکی نانوسیال آب/CuOدر فضای بین استوانه های هم محور چرخان

In the first part of this study, a literature review about the forced convection heat transfer of nanofluids and their mechanisms is performed. after comparing different models for the effective thermal conductivity and the viscosity of nanofluids, the best model is chosen based on the mechanisms to modeling the heat transfer. then, for the first time, the fully developed laminar flow of water/cuo nanofluid in the space between two coaxial cylinders under conditions of forced convection for both the constant temperature and constant heat flux boundary conditions is investigated numerically.the commercial code and the method validated with the literature data at the same condition and the results of the comparison have shown very good agreements. numerical results show that the volume fraction of 0.01 is a transition point from one rate to the lower rate of both walls heat transfer while there are little changes in the friction factor of these boundaries with the particle volume fraction increasing. however, the heat transfer and friction factors on both walls is reduced with the increasing grashofnumber in all geometries. also, the heat transfer of nanofluids is increased and the friction factors is reduced with increasing reynolds number.