Mixed convection in inclined driven cavity with hot moving lid

Laminar mixed convection heat transfer in two dimensional shallow rectangular driven cavities of aspect ratio 5 is studied numerically. The top moving lid of the cavity is at a higher temperature than the bottom wall. Computations are performed for Richardson number ranging from Ri=0.001 to 100 and for Reynolds number keeping fixed at Re = 408.21. Under these conditions cavity encompasses three regimes: dominating forced convection, mixed convection, and dominating natural convection flow. The fluid Prandtl number is taken as 6 representing water. The effect of cavity inclination on the flow and thermal fields are investigated for inclination angles from 0° to 60° . With increasing the inclination angle, interesting behavior of the flow and thermal fields are observed. The streamlines and isotherm plots and the variation of the Nusselt numbers on the hot wall are presented. The average Nusselt number is found to increase with cavity inclination for Ri ≥ 1 . Also it is shown that the average Nusselt number changes mildly with the cavity inclination in the dominant forced convection regime but it increases considerably in the regime with dominant natural convection.