Thermal performance augmentation in a solar air heater with twisted multiple V–baffles

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dc.contributor.authorChompookham, Teerapat
dc.contributor.authorEiamsa-ard, Smith
dc.contributor.authorBuanak, Kalong
dc.contributor.authorPromvonge, Pongjet
dc.contributor.authorMaruyama, Naoki
dc.contributor.authorHirota, Masafumi
dc.contributor.authorSkullong, Sompol
dc.contributor.authorPromthaisong, Pitak
dc.date.accessioned2026-08-06T10:47:26Z
dc.date.available2026-08-06T10:47:26Z
dc.date.issued2024-11-01
dc.description.abstractA 3D numerical investigation of thermal performance augmentation of a twisted multiple V–baffles in a solar air heater is presented. Two important functions of the twisted multiple V–baffles are to generate multiple impinging flows upon the wall to improve the convective heat transfer (compared with a smooth channel) and reduce the pressure drop (compared with a typical multiple V–baffles). These outcomes enhance thermal performance. The results of heat transfer (in terms of a Nusselt number ratio), pressure drop (in terms of a friction factor ratio) and thermal performance (in terms of a thermal enhancement factor) of a twisted multiple V–baffles were compared with both a smooth channel and a typical multiple V–baffles. Eighty–one cases including those with a pitch ratio of PR = 0.4–2.0; blockage ratio, BR = 0.10–0.20; angle of attack, α = 30<sup>o</sup> – 60<sup>o</sup> and a fixed number of twisted loops, n = 2, were investigated in turbulent flow. The results revealed that the twisted multiple V–baffles created multiple impinging jets at the heated wall and help accelerate heat transfer between the wall and the fluid. Compared to a typical multiple V–baffles, the friction factor showed a large decrease while the Nusselt number was slightly lower leading to better thermal performance. Over the study range, PR = 0.4, BR = 0.20, and α = 60<sup>o</sup> appeared to yield the highest thermal enhancement factor, 2.81 at Re = 3000.
dc.identifier.citationInternational Journal of Thermal Sciences, 205, 2024
dc.identifier.doi10.1016/j.ijthermalsci.2024.109295
dc.identifier.issn12900729
dc.identifier.other2-s2.0-85199428551
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/15987
dc.sourceInternational Journal of Thermal Sciences
dc.subjectFriction factor
dc.subjectHeat transfer
dc.subjectSolar air heater
dc.subjectTurbulent flow
dc.subjectTwisted multiple V–baffles
dc.titleThermal performance augmentation in a solar air heater with twisted multiple V–baffles
dc.typeArticle

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