NUMERICAL INVESTIGATION OF EFFECT OF NANOPARTICLES DIAMETER ON FLOW AND HEAT TRANSFER IN LID-DRIVEN CAVITY WITH AN INSIDE HOT OBSTACLE FILLED WITH NANO-FLUID

The present paper focuses on problem of mixed convection fluid flow and heat transfer of Al2O3-water nanofluid with temperature and nanoparticles concentration dependent thermal conductivity and effective viscosity inside Lid-driven cavity having a hot rectangular obstacle. The governing equations are discretized using the finite volume method while the SIMPLER algorithm is employed to couple velocity and pressure fields. The obtained results showed that the average Nusselt number for all range of solid volume fraction decreases with increase in the diameter of nanoparticles.