Abstract
Two-dimensional impinging jets in line have been used for many industrial applications for cooling and heating, but the effectiveness of the heat transfer augmentation has not been well established. The purpose of this study is to clarify the augmented heat transfer performance of impinging air jets in line by means of providing roughnesses on a heat transfer surface. The optimum position of the roughnesses are studied experimentally for the jet Reynolds number of 1×104 when the jet-to-plate spacing is equal to the jet slot width. It is clarified that, even though of no roughness the two jets increases the total heat transfer performance by about 1.4 times that of one jet without roughness regardless of the jet spacing, under the optimum condition the average surface heat transfer coefficient in a semi-enclosed environment increases by about 2.30 times that of one jet without roughness.
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