Thermo-hydraulic optimization of a solar air heater duct with non-periodic rows of rectangular winglet pairs

dc.contributor.authorDezan, Daniel J.
dc.contributor.authorRocha, André D.
dc.contributor.authorSalviano, Leandro O. [UNESP]
dc.contributor.authorFerreira, Wallace G.
dc.contributor.institutionUniversidade Federal do ABC (UFABC)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2020-12-12T02:16:17Z
dc.date.available2020-12-12T02:16:17Z
dc.date.issued2020-09-01
dc.description.abstractSurrogate-based optimization is employed to maximize the thermo-hydraulic performance of a solar air heater duct with non-periodic rows of rectangular winglet pairs mounted in the absorber plate. The present optimization study encompasses the variation of Reynolds number (5000 and 10,000) and of three geometric parameters for each row of rectangular winglets such as chord of the winglets ranging from 8 mm to 40 mm; height of winglets from 8 mm to 21 mm; and angles of attack from 15° to 45° (Flow-Up) and from −45° to −15° (Flow-Down). The Pareto frontiers show that periodic configurations are suboptimal solutions, i.e., the thermo-hydraulic performance of a solar air heater with rectangular winglet pairs not periodically arranged along the channel outperform the periodic arrangements. The aspect ratios and angles of attack for non-periodic and periodic optimized designs are completely different from each other. Moreover, the optimized solutions for Flow-Down arrangement present higher performance than Flow-Up, and this behavior is independent of the Reynolds number. Complex flow patterns and heat transfer mechanisms of the non-periodic optimized solutions are observed, especially the interactions of corner and main vortices along the duct. The first row of winglet pair play the most important role on pressure penalty and heat transfer enhancement when compared to the other rows of rectangular winglet pairs, mainly on Flow-Up arrangement at Re = 10,000. In general, Flow-Up arrangements create a vortex structure more intense than Flow-Down arrangement.en
dc.description.affiliationFederal University of ABC (UFABC) – The Engineering Modeling and Applied Social Sciences Center (CECS), Santo André
dc.description.affiliationDepartment of Mechanical Engineering São Paulo State University (UNESP), Ilha Solteira
dc.description.affiliationUnespDepartment of Mechanical Engineering São Paulo State University (UNESP), Ilha Solteira
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdFAPESP: 2017/06978-3
dc.format.extent1172-1190
dc.identifierhttp://dx.doi.org/10.1016/j.solener.2020.06.112
dc.identifier.citationSolar Energy, v. 207, p. 1172-1190.
dc.identifier.doi10.1016/j.solener.2020.06.112
dc.identifier.issn0038-092X
dc.identifier.scopus2-s2.0-85088382983
dc.identifier.urihttp://hdl.handle.net/11449/200795
dc.language.isoeng
dc.relation.ispartofSolar Energy
dc.sourceScopus
dc.subjectFlow-down
dc.subjectFlow-up
dc.subjectMulti-objective optimization
dc.subjectRectangular winglet vortex generators
dc.subjectSolar air heater
dc.subjectSurrogate-based optimization
dc.titleThermo-hydraulic optimization of a solar air heater duct with non-periodic rows of rectangular winglet pairsen
dc.typeArtigo

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