Journal
EXPERIMENTAL HEAT TRANSFER
Volume 25, Issue 1, Pages 30-47Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/08916152.2011.559567
Keywords
heat transfer enhancement; friction factor; plain twisted tape; wing-cut twisted tape; secondary flow
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This article reports an experimental investigation on the heat transfer, friction factor, and thermal enhancement factor of a tube equipped with vertical wing-cut twisted tapes, horizontal wing-cut twisted tapes, and plain twisted tapes with twist ratios of y = 2.0, 4.4, and 6.0. The obtained results reveal that the heat transfer rate, friction factor, and thermal enhancement factor in the tube equipped with horizontal wing-cut twisted tapes are significantly higher than those in the tube fitted with vertical wing-cut twisted tapes, plain twisted tapes, and a plain tube. An empirical correlation is subsequently derived from the experimental results.
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