Influence of combined non-uniform wire coil and twisted tape inserts on thermal performance characteristics

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dc.contributor.authorEiamsa-ard, S.
dc.contributor.authorNivesrangsan, P.
dc.contributor.authorChokphoemphun, S.
dc.contributor.authorPromvonge, P.
dc.date.accessioned2026-08-06T10:00:37Z
dc.date.available2026-08-06T10:00:37Z
dc.date.issued2010-08-01
dc.description.abstractIn this paper, heat transfer, friction factor and thermal performance behaviors in a tube equipped with the combined devices between the twisted tape (TT) and constant/periodically varying wire coil pitch ratio are experimentally investigated. The periodically varying three coil pitch ratios were arranged into two different forms: (1) D-coil (decreasing coil pitch ratio arrangement) and (2) DI-coil (decreasing/increasing coil pitch ratio arrangement) while the twisted tapes were prepared with two different twist ratios. Each device alone is also tested and the results are subjected for comparison with those from the combined devices. The experiments were conducted in a turbulent flow regime with Reynolds numbers ranging from 4600 to 20,000 using air as the test fluid. Compared to each enhancement device, the heat transfer rate is further augmented by the compound devices. Over the range investigated, the highest thermal performance factor of around 1.25 is found by using DI-coil in common with the TT at lower Reynolds number. In addition, the empirical correlations of the heat transfer (Nu) and pressure drop (f) are also presented. © 2010 Elsevier Ltd.
dc.identifier.citationInternational Communications in Heat and Mass Transfer, 37(7), 850-856, 2010
dc.identifier.doi10.1016/j.icheatmasstransfer.2010.05.012
dc.identifier.issn07351933
dc.identifier.other2-s2.0-77955269136
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/3159
dc.sourceInternational Communications in Heat and Mass Transfer
dc.subjectHeat transfer enhancement
dc.subjectTwisted tape
dc.subjectVariable/non-uniform wire coil
dc.subjectWire coil
dc.titleInfluence of combined non-uniform wire coil and twisted tape inserts on thermal performance characteristics
dc.typeArticle

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