Effect of surface roughness on heat transfer and entropy generation of mixed convection in nanofluid

摘要: In this study, mixed convective heat transfer and entropy generation of Al2O3-water in a lid-driven square cavity with roughness elements on the bottom surface have been studied. The vertical sidewalls are adiabatic, horizontal walls maintained at constant temperature, while top wall is moving velocity. Various Reynolds numbers, Rayleigh nanoparticles concentrations considered. wavy determined by number amplitude elements. It has observed that larger reduces rate increasing total average Bejan (Beavg). Conversely, reduce Beavg. further greater effect Beavg than addition, numbers increases Nusselt generation, reducing Addition base fluid minimizing generation. rises nanoparticle concentrations. lowest for nanofluid could be achieved low fixed cases studied, greatly affected irreversibility friction plays minor role enhancement.In Rayle...