Effect of arc-shaped twisted-baffles on augmented heat transfer in a rectangular duct

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dc.contributor.authorPromvonge, Pongjet
dc.contributor.authorPhila, Arnut
dc.contributor.authorChuwattanakul, Varesa
dc.contributor.authorChokphoemphun, Suriya
dc.contributor.authorEiamsa-Ard, Smith
dc.contributor.authorMaruyama, Naoki
dc.contributor.authorHirota, Masafumi
dc.date.accessioned2026-08-06T10:40:56Z
dc.date.available2026-08-06T10:40:56Z
dc.date.issued2023-02-01
dc.description.abstractIn this current work, the effect of utilizing arc-shaped twisted-baffles (T-ABs) in a rectangular air channel on thermal performance factor (TPF) has been experimentally studied. In these experiments, the influence of the changes in parameters such as dimensions of pitch ratio (p/w), attached arc-shape angle (α), and Reynolds number (Re) are explored. The comparisons demonstrate that a channel mounted with arc-shaped twisted-baffles yielded considerably greater Nusselt numbers than a smooth channel, possibly attributable to multiple-impinging jets near the channel surface. Heat transfer enhancements of twisted arc-shaped baffles (T-AB) having larger attack angles were superior to those having smaller attack angles. The one with α = 90o offered greater heat transfer rates than the ones with α = 20o, 40o, 60o, and 80o by approximately 8%, 7%, 4%, and 2%, respectively. The superior heat transfer was attributed to the better contact between the working fluid and heat transfer surfaces. In addition, utilizing arc-shaped twisted-baffles with the lowest p/w of 4.0, in a channel produced stronger vortices and multiple impinging jets, which caused better fluid mixing than other p/w. The optimum condition is achieved using T-ABs at an attached arc-shape angle of α = 90o, p/w = 4.0 and Re = 4000, where the heat transfer rate (Nu), friction factor (f) and TPF are found to be, respectively, 3.31, 4.68 and 1.98 times greater than those of a plain channel.
dc.identifier.citationCase Studies in Thermal Engineering, 42, 2023
dc.identifier.doi10.1016/j.csite.2023.102754
dc.identifier.issn2214157X
dc.identifier.other2-s2.0-85147729838
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/14266
dc.sourceCase Studies in Thermal Engineering
dc.subjectArc-shaped twisted-baffles
dc.subjectHeat transfer
dc.subjectMultiple impinging jets
dc.subjectNusselt number
dc.subjectSolar air heater
dc.subjectTransverse baffle
dc.titleEffect of arc-shaped twisted-baffles on augmented heat transfer in a rectangular duct
dc.typeArticle

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