NATURAL-CONVECTION IN INCLINED RECTANGULAR ENCLOSURES WITH PERFECTLY CONDUCTING FINS ATTACHED ON THE HEATED WALL

The natural convection heat transfer in inclined rectangular enclosure s with perfectly conducting fins attached to the heated wall is numeri cally studied. The parameters governing this problem are the Rayleigh number (10(2) less than or equal to Ra less than or equal to 2 x 10(5) ), the aspect ratio of the enclosures (2.5 less than or equal to A = H '/L' less than or equal to infinity), the dimensionless lengths of the partitions (0 less than or equal to B = l'/L' less than or equal to 1 ), the aspect ratio of micro-cavities (A less than or equal to C = h'/ L' less than or equal to 0.33), the inclination angle (0 less than or equal to phi less than or equal to 60 degrees) and the Prandtl number (Pr = 0.72). The results indicate that the heat transfer through the c over is considerably affected by the presence of the fins. At low Rayl eigh numbers, the heat transfer A regime is dominated by conduction. W hen B approximate to 0.75 and a C approximate to 0.33, the heat transf er through the cold wall decreases considerably. This trend is enhance d when the enclosure is inclined. Useful engineering correlations are derived for practical applications.