Measurements of the pressure drops for water flowing in small diameter tubes having U-type wavy configuration are presented. The inner diameters of the test copper tubes D are 3.43, 5.07, and 8.29 mm, whereas the curvature ratios 2R/D and spacer length L/D span from 3.75 to 7.87 and 1.93 to 7.0, respectively. The test range of the Reynolds number for water is about 200
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Chen et al. (2003) studied this question.
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