Effect of perforated twisted-tapes with parallel wings on heat transfer enhancement in a heat exchanger tube

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dc.contributor.authorThianpong, C.
dc.contributor.authorEiamsa-Ard, P.
dc.contributor.authorPromvonge, P.
dc.contributor.authorEiamsa-Ard, S.
dc.date.accessioned2026-08-06T10:03:58Z
dc.date.available2026-08-06T10:03:58Z
dc.date.issued2012-01-01
dc.description.abstractThis article reports an experimental investigation on heat transfer and pressure drop characteristics of turbulent flow in a heating tube equipped with perforated twisted tapes with parallel wings (PTT) for Reynolds number between 5500 and 20500. The design of PTT involves the following concepts: (1) wings induce an extra turbulence near tube wall and thus efficiently disrupt a thermal boundary layer (2) holes existing along a core tube, diminish pressure loss within the tube. The parameters investigated were the hole diameter ratio (d/W = 0.11, 0.33 and 0.55) and wing depth ratio (w/W = 0.11, 0.22 and 0.33). A typical twisted tape was also tested for an assessment. Compared to the plain tube, the tubes with PTT and TT yielded heat transfer enhancement up to 208% and 190%, respectively. The evaluation of overall performance under the same pumping power reveal that the PTT with d/W = 0.11 and w/W = 0.33, gave the maximum thermal performance factor of 1.32, at Reynolds number of 5500. Empirical correlations of the heat transfer, friction factor and thermal performance for tubes with PTTs were also developed. In addition, the swirling/axial flow patterns of tube with PTT were visualized using dye injection technique. © 2011 Published by Elsevier Ltd.
dc.identifier.citationEnergy Procedia, 14, 1117-1123, 2012
dc.identifier.doi10.1016/j.egypro.2011.12.1064
dc.identifier.issn18766102
dc.identifier.other2-s2.0-84858428995
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/4104
dc.sourceEnergy Procedia
dc.subjectHeat exchanger
dc.subjectHeat transfer enhancement
dc.subjectThermal performance
dc.subjectTwisted tape
dc.titleEffect of perforated twisted-tapes with parallel wings on heat transfer enhancement in a heat exchanger tube
dc.typeConference Paper

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