Performance assessment of solar air heater duct roughened with perforated-winglet vortex generators

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dc.contributor.authorKoolnapadol, Narin
dc.contributor.authorPromvonge, Pongjet
dc.contributor.authorSkullong, Sompol
dc.date.accessioned2026-08-06T10:15:02Z
dc.date.available2026-08-06T10:15:02Z
dc.date.issued2017-01-01
dc.description.abstractAn experimental study has been conducted to investigate heat transfer, friction loss and thermal performance characteristics of turbulent flow in a solar air heater channel artificially roughened on one side (absorber plate) with multiple perforated-winglet vortex generator (PWVG). Air as the working fluid enters the test duct having a uniform surface heat-flux with Reynolds number (Re) ranging from 5200 to 24,000 in the present work. Effects of four different punched hole/pore diameters of winglet (d=2 mm, 4 mm, 6 mm and 8 mm) at a single relative winglet height (RB=b/H=0.6), relative winglet pitch (RP=P/H=3) and attack angle (β= 60°) on thermal characteristics are examined. The experimental results show that the PWVG provides the drastic increase in Nusselt number (Nu) and friction factor (f) values over the flat/smooth channel. In addition, substantial increases in Nu and f values are found for the rise in hole sizes. The maximum Thermal Enhancement Factor (TEF) is found for the pore diameter of 2 mm at lower Reynolds number. The present results are also compared with the results from the typical or solid winglet, TWVG (non-punched hole of winglet).
dc.identifier.citationInternational Journal of Smart Grid and Clean Energy, 6(1), 31-39, 2017
dc.identifier.doi10.12720/sgce.6.1.31-39
dc.identifier.issn23154462
dc.identifier.other2-s2.0-85040463249
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/7204
dc.sourceInternational Journal of Smart Grid and Clean Energy
dc.subjectAbsorber plate
dc.subjectSolar air heater
dc.subjectThermal performance
dc.subjectV-baffle
dc.subjectVortex generator
dc.titlePerformance assessment of solar air heater duct roughened with perforated-winglet vortex generators
dc.typeArticle

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