Journal
EXPERIMENTAL HEAT TRANSFER
Volume 33, Issue 6, Pages 560-571Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/08916152.2019.1691086
Keywords
Lanced ring insert; pitch ratio; diameter ratio; Nusselt number; friction factor
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Circular ring inserts are found to enhance the heat transfer rates in the tube flow, while perforations in the ring inserts mitigate the frictional losses. In this study, the geometry of perforated ring is modified by creating lanced holes with a deflector. The experimental data for lanced ring are collected by varying the pitch ratio from 3.33-6.66 and diameter ratio from 0.5-0.6 in the Reynolds number range of 10000-37754. The enhancements in the Nusselt number and friction factor are found to vary in the range of 1.69-4.1 and 16-72, respectively.
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