Abstract
An experimental study of fully developed turbulent air flow in rectangular channels of different aspect ratios (W/H = 3:1, 1:3, 2:1, and 1:2) with two opposite rib-roughened walls was performed to determine the effects of configuration of full and discrete ribs on the heat transfer coefficient and friction factor. Transverse and angled rib configurations were studied. The tests were performed for Reynolds numbers from 10,000 to 80,000. Discrete angled ribs with higher aspect ratio channel improved the heat transfer performance. On the basis of pumping power consumption, the performance of discrete 45° ribs was better than other rib configurations. Overall, discrete angled ribs with lower aspect ratio performed better.
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