AUGMENTED HEAT-TRANSFER IN RECTANGULAR CHANNELS OF NARROW ASPECT RATIOS WITH RIB TURBULATORS
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The effects of the rib angle-of-attack on the distributions of the local heat transfer coefficient and on the friction factors in short rectangular channels of narrow aspect ratios with a pair of opposite rib-roughened walls are determined for Reynolds numbers from 10 000 to 60 000. The channel width-to-height ratios are 2 4 and 1 4; the corresponding rib angles-of-attack are 90, 60, 45, and 30, respectively. The results indicate that the narrow-aspect-ratio channels give better heat transfer performance than the wide-aspect-ratio channels for a constant pumping power. Semi-empirical friction and heat transfer correlations are obtained. The results can be used in the design of turbine cooling channels of narrow aspect ratios. 1989.