Simulation of the mixed convection in 3d cylindrical cavity filled with Copper-OxideWater nanofluid (original) (raw)

The problem of mixed convection heat transfer and flow of Copper oxide and water nanofluid were studied for different Reynolds numbers and concentrations. The geometry of the simulation is a cylindrical lid-driven cavity with hottop wall and cold bottom wall. The rest of the walls were kept as isolated walls. The top wall is rotating around the axis of the cylinder with a constant angular velocity. The equations were converted to non-dimensional form and the effect of nano particles were implementedby considering the effective Reynolds and Prandtl numbers. The case was simulated for Re= 100, 400 and 1000 and nanoparticle mass concentration of 0 to 5%. The results were presented in the form of the isothermal contours and average Nusselt number curves of the top walls for different Re numbers and concentrations. The results show that the particles do not have any effect on the flow field which decreases the risk of corrosion. Also, the most effective parameter is the Reynolds number which increases the Nusselt number dramatically. Increasing concentration of the particles increase the Nusselt number but there is an optimum value for it and for larger values, it starts decreasing.