Study of laminar mixed convection for two-sided non-facing lid-driven differentially heated square cavity

الملخص EN

Laminar mixed convection for incompressible flow in two sided non-facing lid driven square cavities are numerically investigated in this study using ANSYS 12.1 commercial software.

Depending on the movement direction for the walls and various temperature locations on these walls, cases have been considered.

Vortices are generated by moving the upper and the right walls in the first case, while in the second case, bottom and left walls are using with different locations for hot and cold temperatures on the moving walls.

For each case, the non-facing walls that which in opposite side to the moving walls are thermally insulated and stationary.

Natural and forced convections are distinguished by an important relative value of Richardson number (Ri = Gr / Re2) which relates the fluid flow and the heat transfer in the cavity.

Governing parameters are varied as 0.1 < Ri < 10 and Pr = 0.7.

The obtained results show that the fluid flow and heat transfer in the cavity are effected by Richardson numbers, locations and directions of moving walls, and locations of hot and cold temperatures.

Two sided non-facing lid driven for the cavity is give the same results for streamlines and isotherms with the another opposite two sided non-facing lid-driven, but inversely and upside down for different Richardson numbers.

The results of this investigation illustrate that when install the hot temperature on the lower moving wall and the cold temperature on the left moving wall in the second case, the local Nusselt number in this situation is to be relatively higher and heat transfer is enhance, as compared with the other differential heated cavities orientations.