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We conducted an optimization using the second-order response surface method to determine the transverse rib geometry required to achieve the highest cooling performance in a circular channel. The best rib geometry was based on three design variables; rib height, rib width, and rib pitch. The turbulent heat transfer coefficients and friction losses were first calculated and then used to determine the...
The combined effects of duct aspect ratio and rotation on heat/mass transfer characteristics are investigated. Mass transfer experiments are conducted to obtain detailed local heat/mass transfer coefficients on the leading and trailing surfaces in rotating two-pass ducts with a pair of opposite rib-roughened walls. The ducts of three different aspect ratios (W/H=0.5, 1.0, and 2.0) are employed with...
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