Heat transfer performance evaluation of a solar air heater duct with multiple tapered V-baffles

Simple item page
dc.contributor.authorThianpong, C.
dc.contributor.authorKaewkosum, P.
dc.contributor.authorWoncharee, K.
dc.contributor.authorKeaitnukul, W.
dc.contributor.authorMaruyama, N.
dc.contributor.authorHirota, M.
dc.contributor.authorChamoli, S.
dc.contributor.authorEiamsa-ard, S.
dc.contributor.authorPhila, A.
dc.date.accessioned2026-08-06T10:53:00Z
dc.date.available2026-08-06T10:53:00Z
dc.date.issued2025-12-01
dc.description.abstractThis report aims to study the heat transfer enhancement, pressure loss characteristics, and thermal performance of a channel equipped with multiple tapered V-shaped baffles (MTVBs). The effects of up-facing and down-facing orientations, converging (C) and diverging(D) configurations, variations in the taper ratio (e<inf>CR</inf> and e<inf>DR</inf> = 0.0 and 0.5), and Reynolds number (6000 ≤ Re ≤ 24,000) are examined. The performance of UF-C-MTVBs, DF-C-MTVBs, UF-D-MTVBs, and DF-D-MTVBs is analyzed and compared with that of the conventional transverse baffles (TBs) and MVBs (e<inf>DR</inf> = 1.0). The experimental setup maintained a constant attack angle (α) of 45°, pitch ratio (p/H) of 1.5, width-shaped ratio (W<inf>b</inf>/W) of 0.25, and blockage ratio (e/H) of 0.3. Tests were conducted at a fixed Prandtl number of 0.71, and a thermochromic liquid crystal sheet was utilized to assess the local Nusselt number distribution on the wall installed with UF-C-MTVBs, DF-C-MTVBs, UF-D-MTVBs, and DF-D-MTVBs. The results reveal that the channel with MVBs (e<inf>DR</inf> = 1.0) achieves the greatest heat transfer rate, with a Nu/Nu<inf>s</inf> ratio of up to 4.37 while a f/f<inf>s</inf> ratio reaching 48.12. In contrast, D-MTVBs at e<inf>DR</inf> = 0.0, despite having a lower Nu/Nu<inf>s</inf> ratio (maximum 3.87), attain the maximum thermal performance of 1.39 at Re = 6000, owing to their optimized design that effectively enhances heat transfer while minimizing pressure drop.
dc.identifier.citationInternational Communications in Heat and Mass Transfer, 169, 2025
dc.identifier.doi10.1016/j.icheatmasstransfer.2025.109752
dc.identifier.issn07351933
dc.identifier.other2-s2.0-105017965648
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/17449
dc.sourceInternational Communications in Heat and Mass Transfer
dc.subjectHeat transfer
dc.subjectMultiple tapered V-baffle
dc.subjectSolar air preheater duct
dc.subjectThermal performance
dc.titleHeat transfer performance evaluation of a solar air heater duct with multiple tapered V-baffles
dc.typeArticle

Files

Collections

Research