Experimental studies are carried out to investigate the tip-wall heat transfer in a U-bend channel. Liquid crystal technique is employed to measure the wall temperature and obtain the heat transfer coefficients. The Reynolds number is varied from 10,000 to 24,000. It is found that the tip-wall heat transfer in a U-bend channel is characterized by the feature of jet impingement. The local Nusselt number is scaled by a factor of Re0.5, which is close to the heat transfer scaling in the jet impingement for low nozzle-plate spacings. The result corroborates the previous studies that the jet impingement is a primary mechanism to enhance the heat transfer in a U-bend channel.

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