Abstract

Heat Transfer of natural convection in an rectangular enclosure heated with a uniform heat flux is investigated numerically in this study. Two-dimensional, steady, laminar flow is considered. Differential Quadrature (DQ) technique was used for numerical solutions. Two walls of enclosure are isothermal and the others are partially heated with constant heat flux. Grashof numbers, length of heaters and aspect ratio of enclosure are significant parameters for fluid flow and distribution of temperature. Considering these parameters, Grashof number is chosen between 104 -106 , aspect ratio is chosen as A=0.5, 1 and 2. and length of heaters are 0.2≤ ε ≥1. Results show that, quantitiy of heat transfer increases while Grashof number increases. Considering heated bottom and left walls, value of average Nusselt number is higher in comparison with bottom wall. While length of heaters increases, temperature increases and heat transfer rate decreases. Average Nusselt number value reachs to maximum value for tall cavities.