Flow and thermal mechanisms in a heat exchanger tube inserted with twisted cross-baffle turbulators

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dc.contributor.authorNanan, K.
dc.contributor.authorThianpong, C.
dc.contributor.authorPimsarn, M.
dc.contributor.authorChuwattanakul, V.
dc.contributor.authorEiamsa-ard, S.
dc.date.accessioned2026-08-06T10:16:24Z
dc.date.available2026-08-06T10:16:24Z
dc.date.issued2017-03-05
dc.description.abstractThe turbulent forced convective heat transfer behaviors in a tube inserted with baffle turbulators (typical straight baffles, straight cross-baffles, straight alternate-baffles, twisted-baffles, alternate twisted-baffles, and twisted cross-baffles) have been experimentally and numerically investigated. The influence of pitch ratio (P/D) from 1.0 to 2.0 and Reynolds numbers (Re) from 6000 to 20,000 are also reported. Among the studied turbulators, the twisted cross-baffles gave the highest heat transfer enhancement and thermal enhancement factor while the straight cross-baffles gave the lowest heat transfer rate and thermal enhancement factor. The twisted-baffles, alternate twisted-baffles, and twisted cross-baffles created high longitudinal vortex/swirl around the tube core. The strongest longitudinal vortex/swirl was achieved by the use of twisted cross-baffles. The recirculation flows were found in the tube fitted with straight baffles (a recirculation flow), straight alternate-baffles (double recirculation flows) and straight cross-baffles (quadruple recirculation flows). The heat transfer rate, friction factor and thermal enhancement factor increased with decreasing pitch ratio (P/D) and increasing Reynolds number (Re). At the optimum condition of the smallest pitch ratio (P/D = 1.0) and the lowest Reynolds number (Re = 6000), the twisted cross-baffles offered the highest thermal enhancement factor of 1.7.
dc.identifier.citationApplied Thermal Engineering, 114, 130-147, 2017
dc.identifier.doi10.1016/j.applthermaleng.2016.11.153
dc.identifier.issn13594311
dc.identifier.other2-s2.0-85002427111
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/7565
dc.sourceApplied Thermal Engineering
dc.subjectHeat transfer enhancement
dc.subjectStraight alternate-baffle
dc.subjectStraight cross-baffle
dc.subjectTurbulator
dc.subjectTwisted alternate-baffle
dc.subjectTwisted cross-baffle
dc.subjectTwisted tape
dc.subjectTwisted-baffle
dc.subjectTypical straight baffle
dc.titleFlow and thermal mechanisms in a heat exchanger tube inserted with twisted cross-baffle turbulators
dc.typeArticle

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