Heat transfer visualization of swirling impinging jets using nozzle with centrally hollow helical-tape

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dc.contributor.authorEiamsa-Ard, Smith
dc.contributor.authorKunnarak, Kengkla
dc.contributor.authorWongcharee, Khwanchit
dc.contributor.authorChuwattanakul, Varesa
dc.date.accessioned2026-08-06T10:28:32Z
dc.date.available2026-08-06T10:28:32Z
dc.date.issued2020-05-01
dc.description.abstractThe present research was conducted to determine the heat transfer visualization of swirling impinging jets (SIJs) induced by nozzle with centrally hollow helical-tape using a thermochromic liquid crystal (TLC) sheet. The effects of jet-to-plate spacing ratios (L/D= 2.0, 4.0, 6.0 and 8.0) and Reynolds numbers (10,000 Re 20,000) on the radial uniformity and intensity of convective heat transfer were investigated. The experimental results of SIJs were compared with those of conventional impinging jets (CIJs). The formation of swirl flow of swirling impinging jet (SIJs) helped in improving the uniformity of local heat transfer or Nusselt number (Nu) and also average Nusselt number, as compared to those of conventional impinging jets (CIJs). Furthermore, the average Nusselt number (Nu) increased as jet-to-plate spacing ratio (L/D) decreased while Reynolds number (Re) increased for both conventional impinging jets (CIJs) and swirling impinging jets (SIJs). The highest Nusselt number (Nu) of swirling impinging jet (SIJ) was obtained at the jet-to-plate spacing ratio (L/D) of 4.0 and Reynolds number (Re) of 20,000. The maximum Nusselt number (Nu) of swirling impinging jet (SIJ) was higher than that of conventional impinging jets (CIJs) at similar conditions by around 5.3%.
dc.identifier.citationInternational Journal of Mechanical Engineering and Robotics Research, 9(5), 673-678, 2020
dc.identifier.doi10.18178/ijmerr.9.5.673-678
dc.identifier.issn22780149
dc.identifier.other2-s2.0-85084384991
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/10932
dc.sourceInternational Journal of Mechanical Engineering and Robotics Research
dc.subjectCentrally hollow helical-tape
dc.subjectHeat transfer
dc.subjectSwirl flow
dc.subjectSwirling impinging jet
dc.titleHeat transfer visualization of swirling impinging jets using nozzle with centrally hollow helical-tape
dc.typeArticle

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