Effect of Conductive Baffles on Natural Convection Heat Transfer in Porous Medium inside Enclosure


Two dimensional numerical study of the effect of high thermal conductive baffles on natural convection heat transfer in saturated porous medium inside enclosure. The top and bottom surface of the enclosure are insulated, the two vertical walls of the enclosure have different constant temperature, high conductive thin baffles are attached on the two vertical walls. The governing equations were solved by finite difference method. The results inserted for different value of Rayleigh number and different position’s of the baffles with change in length of baffles, when the baffles attached to the hot and cold walls in distances (0.25,0.75) respectively from bottom surface, also when the baffles attached to the hot and cold walls in distance ( 0.75 , 0.25 ) respectively from bottom surface. The length of baffles in the two cases changed in range ( 0.2 – 0.8 ). For the above cases The Rayleigh number changed in range ( 150 – 750 ). The results are represented by streamlines and isotherm lines to show the behavior of the fluid circulation and temperature distribution. Also some graphics had been obtained which represent the relationship between Nusselt and Rayleigh numbers with the position and length of baffles. The results show that increasing Rayleigh number leads to increase in the Nusselt number for two cases. But in the two cases the increasing in the baffles length results a decreases in Nusselt number.