Abstract
Heat transfer and fluid flow in smooth and rib-roughened two-pass channels with a 180°sharp bend are investigated experimentally. Ribs are attached on two opposite walls of the straight passages with angles 90°and 60°to the flow. For 60°ribs, four different combinations of rib patterns in both the 1st and 2nd passes are studied. More than 450 thermocouples are utilized to record detailed distributions of local heat transfer coefficients over the four side walls of the entire channel. Flow visualization tests are also conducted. Based on the measured results, the effects of interaction on the heat transfer characteristics between the rib and the bend-induced secondary flows are disclosed. The rib-arrangement which gives the highest heat transfer performance is identified.
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