Enhanced forced convection heat transfer of a heat exchanger tube utilizing serrated-ring turbulators

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dc.contributor.authorPimsarn, M.
dc.contributor.authorSamruaisin, P.
dc.contributor.authorEiamsa-ard, P.
dc.contributor.authorKoolnapadol, N.
dc.contributor.authorPromthaisong, P.
dc.contributor.authorEiamsa-ard, S.
dc.date.accessioned2026-08-06T10:34:06Z
dc.date.available2026-08-06T10:34:06Z
dc.date.issued2021-12-01
dc.description.abstractExperiments were performed to study the thermohydraulic behaviors of heating tubes equipped with serrated-ring bundles as turbulators. Their thermohydraulic characteristics are reported in terms of Nusselt numbers (Nu) and friction factors (f) as well as performance in terms of a thermohydraulic performance index (TPI) at identical pumping power. Influences of serrated-ring diagonal angles (θ = 15°, 30°, 45° and 60°), pitch ratios (PR = 6.0, 8.0 and 12.0) and Re were examined. Various geometries of serrated-ring bundles can affect the laminar sub-layer disruption, creating a reversing flow, reconnecting the separated flow to the surface, and delaying the thermal/velocity boundary layer development. These are the most important mechanisms that lead to enhanced force convection heat transfer in a fluid flow. The heat transfer rate, friction loss and TPI increased with decreasing pitch ratio (PR) and serrated-ring diagonal angle (θ ). Heat transfer rate and friction factor were increased to 2.2 and 8.8 times that of a plain tube, respectively. Over the range investigated, the highest TPI, 1.16, was found using a serrated-ring bundle having θ = 15° and PR = 6.0 at Re = 4000.
dc.identifier.citationCase Studies in Thermal Engineering, 28, 2021
dc.identifier.doi10.1016/j.csite.2021.101570
dc.identifier.issn2214157X
dc.identifier.other2-s2.0-85117714204
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/12425
dc.sourceCase Studies in Thermal Engineering
dc.subjectHeat transfer enhancement
dc.subjectReverse flow
dc.subjectSerrated-ring bundle
dc.subjectTurbulator
dc.subjectTurbulence
dc.titleEnhanced forced convection heat transfer of a heat exchanger tube utilizing serrated-ring turbulators
dc.typeArticle

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