MIXED CONVECTION IN A LID-DRIVEN CAVITY FILLED BY A MICROPOLAR NANOFLUID WITH AN INSIDE CIRCULAR CYLINDER

摘要

In this study, we numerically investigated steady mixed-convection flow and heat transfer in a lid-driven cavity filled by micropolar nanofluids with an inside circular cylinder by using the finite volume method. The inner circular cylinder and the vertical walls of the cavity were taken as adiabatic. The cavity is subjected to moving upper wall with constant temperatures on the top and bottom walls. Computations are carried out to investigate the effects of the Reynolds number, Richardson number, micropolar parameters, and the radius with positions of the inner circular cylinder on heat transfer, nanoparticle concentrations, microrotation, and fluid flows inside the square cavity for a strong concentration case (zeta = 0). Local results show that there is an effect of a micropolar parameter on the flow and heat transfer. The results for k = 0, which corresponds to the Newtonian fluid case, are compared with the previous published studies from the open literature and good agreement is obtained.