Effect of prandtl number on entropy generation of nanofluids over a stretching surface

In this study the entropy generation for CUO nanofluid flow over a stretching sheet investigated numerically. Effect of the thermal expansion coefficient and free convection parameter on the velocity and temperature profile are investigated. Also the influence of thermal expansion coefficient, heat source/sink parameter, nanoparticle volume fraction of aluminum oxide (CUO) and free convection parameter, Prandtl number, Reynolds number on the entropy generation number has been investigated. By increasing of thermal expansion coefficient, the volume fraction of nanoparticles and buoyancy parameter, the entropy generation number is reduced, and with increasing Prandtl number and Reynolds number, the entropy generation number increased, And by changing heat source/sink parameter from positive to negative values the entropy generation number increases