CFD Analysis of Natural Convection in a Square Cavity with Two Thin Baffles of Different Lengths and Positions on the Vertical Opposite Walls

The natural convection in a square cavity partially heated which is created by adiabatic and isothermal for the horizontal and vertical boundaries respectively. Two isolated baffles linked to vertical walls with different arrangements is studied numerically in this article. The length and location of the baffle are the important parameters affected by natural convection, therefore, these parameters have been investigated for different Rayleigh numbers. The total length of baffles is assumed to be constant (i.e. the sum length of baffles on hot and cold walls equals the length of the square cavity). The results of this study show that the position and length of baffles have a significant effect on the flow characteristics and heat transfer of the enclosure. When the Rayleigh number increases, the average Nusselt number increases too. Also, the directly proportional governs the relationship between Nu increasing and increases in the length of the obstacle in all cases. The positions for the baffle have feature effectiveness on the transfer of heat, which is bigger in position 1 from position 2.