Abstract
This paper presents the effect of roughness on heat transfer for semi-cylindrical cavity. Heat transfer measurements are performed on smooth and rough surfaces for different tilt angles. The results are compared with a rectangular cavity of the same surface area to study the effect of cavity shape on heat transfer. The roughness composed of 0.002 m diameter rods installed along the length of the cavity at equal spacing. Roughness shows a large effect on heat transfer for the semi-cylindrical cavities. Two competing effects are present with the existence of roughness. Roughness may increase the blockage effect on the flow that can cause the buoyancy force to decrease, but on the other hand it increases the turbulence intensity resulting in a higher heat transfer. Both effects are function of tilt angles. Heat transfer for the cylindrical cavity is higher than the rectangular cavity for all tilt angles. This increase in heat transfer for the cylindrical cavity is due to the absence of sharp corners that can slow the buoyancy driven convection mechanism.
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