Nanofluid Predication Of Lid Driven Mixed Convection In Square Cavity With Adiabatic Elliptic Body

Numerical investigation of the mixed convection heat transfer of Al2O3 water-nanofluid in a square cavity containing an adiabatic elliptic body. The top wall is moved as lid-driven and maintained at Th, while the bottom wall is cooled isothermally at Tc. The stream function–vorticity scheme was used to solve the continuity, momentum, and energy equations. The results were validated by comparison the code results used in the present study with the previous results and found to be in very good agreement. The Richardson number was fixed at 1.0 (mixed convection). The temperature difference values between the hot and cold walls were ∆T=1 and 10. Different values of nanoparticles volume fraction were used (𝜑 =0, 0.02, 0.04, 0.08, 0.1, 0.15). Two positions of elliptic body were used: horizontal and vertical. Results show that there is a slight effect for changing the position of inner body from horizontal to vertical position on the behavior of streamlines, thermal patterns, skin friction factor and average Nusselt number on the moving top wall. Moreover, the average heat transfer rate increases with increase in nanoparticles volume fraction and temperature gradient.