Effect of sparsely placed twisted tapes installed with multiple-transverse twisted-baffles on heat transfer enhancement

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dc.contributor.authorSamruaisin, P.
dc.contributor.authorKunnarak, K.
dc.contributor.authorChuwattanakul, V.
dc.contributor.authorEiamsa-ard, S.
dc.date.accessioned2026-08-06T10:28:36Z
dc.date.available2026-08-06T10:28:36Z
dc.date.issued2020-05-01
dc.description.abstractThe influences of sparsely placed twisted tapes installed with multiple-transverse twisted-baffles on heat transfer and thermal enhancement factor characteristics of tubes were experimentally studied. The tests were performed using sparsely placed twisted tapes with a twist ratio (y/W) of 3.0, a tape width (W) of 60 mm and a space width-to-tape width ratio (S/W) of 0.8. Each twisted tape was installed with multiple-transverse twisted-baffles. The study encompassed multiple-transverse twisted-baffles with four twist ratios (s/w) of 2.0, 2.5, 3.0 and 3.5 and five width ratios (w/W) of 0.10, 0.13, 0.16, 0.19 and 0.22. A typical twisted tape was also tested for assessment. The results showed that twisted tapes installed with transverse twisted-baffles gave higher heat transfer rates, friction factors and thermal enhancement factors (η) than a typical twisted tape. This is attributed to the combined actions of swirl flow caused by the twisted tape inserts and an additional flow disturbance caused by the multiple-transverse twisted-baffles. For the tube with compound devices, the heat transfer rate, friction loss and thermal enhancement factor increased with increasing s/w and w/W of multiple-transverse twisted-baffles. The tube with sparsely placed twisted tapes installed with multiple-transverse twisted-baffles yielded the highest thermal enhancement factor of 1.32.
dc.identifier.citationJournal of Thermal Analysis and Calorimetry, 140(3), 1159-1175, 2020
dc.identifier.doi10.1007/s10973-019-09202-8
dc.identifier.issn13886150
dc.identifier.other2-s2.0-85077546383
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/10943
dc.sourceJournal of Thermal Analysis and Calorimetry
dc.subjectEnhanced heat transfer
dc.subjectHeat transfer
dc.subjectSparsely placed tape
dc.subjectTransverse twisted-baffle
dc.subjectTwisted tape
dc.titleEffect of sparsely placed twisted tapes installed with multiple-transverse twisted-baffles on heat transfer enhancement
dc.typeArticle

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