Numerical Heat Transfer Investigation in a Solar Receiver Heat Exchanger Channel with Punched Elliptical-Winglet Vortex Generators

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dc.contributor.authorPromthaisong, Pitak
dc.contributor.authorPromvonge, Pongjet
dc.contributor.authorKhanoknaiyakarn, Chitakorn
dc.contributor.authorSkullong, Sompol
dc.date.accessioned2026-08-06T10:30:52Z
dc.date.available2026-08-06T10:30:52Z
dc.date.issued2021-01-01
dc.description.abstractThermal performance in a solar receiver heat exchanger (SRX) channel with punched elliptical-winglet vortex generator (P-EW) mounted on the absorber plate is numerically examined for Reynolds number (Re) ranging from 4000 to 24,000. In the present simulation, the P-EW characteristics included three ratios of winglet pitches (P<inf>R</inf> = 2.0, 1.5 and 1.0) including four sizes of the perforated-holes (nondimensional hole diameter, d<inf>R</inf>= 0.0, 0.25, 0.417 and 0.583) at one value of the attack angle (α =30°) and relative height (B<inf>R</inf>= 0.48). The computation reveals that employing P-EW generally yields considerably large friction factor (f) and Nusselt number (Nu) than the flat-plate channel alone. The use of smaller hole size causes the rise in Nu and f. It is noticeable that counter-spinning vortices pairs generated by the multiple P-EW can induce the impinging flow onto the absorber plate together with the air jet coming out of the hole, leading to the rise in the heat transfer rate greater than the smooth flat-plate channel. The highest thermal performance of about 1.9 was seen for the one with P<inf>R</inf> = 1.5 and d<inf>R</inf> = 0.417.
dc.identifier.citationEngineering Journal, 25(10), 105-114, 2021
dc.identifier.doi10.4186/ej.2021.25.10.105
dc.identifier.issn01258281
dc.identifier.other2-s2.0-85122397421
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/11564
dc.sourceEngineering Journal
dc.subjectElliptical-winglet
dc.subjectFlow resistance
dc.subjectHeat exchanger
dc.subjectThermal performance
dc.subjectVortex generator
dc.titleNumerical Heat Transfer Investigation in a Solar Receiver Heat Exchanger Channel with Punched Elliptical-Winglet Vortex Generators
dc.typeArticle

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