Numerical Study of Natural Convective Heat Transfer in an Air Filled Square Cavity Heated from Below and Symmetrically Cooled from the Sides with a Partition in the Hot Wall

Abstract

A two-dimensional numerical study of laminar natural convection in a square enclosure filled with air with a wall partially heated on the bottom is presented. The heat source is located on the lower wall with different heated widths varied from 20 to 80% (ε = 0.2-0.8) of the total width of the lower wall and different heights h = H/4 and H/2 of the partition. The effect of the partition height on the main system dynamics is investigated through solution of the two-dimensional Navier-Stokes equations and the energy equation by means of a finite volume method based on the SIMPLE algorithm. The influence of the Rayleigh number (Ra = 10 3 to 10 6 ) and the hot wall length is also examined. It is shown that the average Nusselt number grows when ε increases and when h decreases. For a given value of ε and h, the average Nusselt number increases as Ra increases. It is concluded that the partition height causes a decrease in the average Nusselt number.

Analysis of Entropy Generation for Horizontal Heated Cylinder by Natural Convection and Radiation

“…Said K. et al 52) studied the entropy generation done by natural convection heat transfer for Square Cavity with different inclination. Zemani-Kaci et al 53) numerically analyzed the natural convection for square cavity on side heated while the other cooled.…”