Experimental investigation of pulsating flow structures and heat transfer characteristics in sinusoidal channels

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dc.authoridSahin, Besir/0000-0003-0671-0890
dc.contributor.authorKurtulmus, Nazim
dc.contributor.authorSahin, Besir
dc.date.accessioned2025-01-06T17:43:16Z
dc.date.available2025-01-06T17:43:16Z
dc.date.issued2020
dc.description.abstractIn the present work, hydrodynamics and heat transfer characteristics in the sinusoidal channel are investigated experimentally for both steady and pulsating flow conditions. The experiments for heat transfer investigations were performed under a constant heat flux in the range of Strouhal number, St 0.11 <= St <= 2.07for the Reynolds number, in the range of 4 x 10(3) <= Re <= 7 x 10(3). After seeing the improvement of heat transfer with employing pulsation to the working fluid the hydrodynamics of pulsating flow was analyzed by considering the pulsating flow characteristics such as the time-averaged streamlines topology, (Psi), streamwise velocity distribution, < u >, cross-streamwise velocity distribution, < v >, and turbulent Reynolds stress, (u'v') over bar /U-2 using instantaneous flow data measured by the Particle image velocimetry (PIV) system. The results revealed that pulsating flow is highly effective for the lower turbulent flow case in the sinusoidal channel. As the Reynolds number increases, the effect of Strouhal number, St becomes less effective. There is an optimum Strouhal number,St value for different Reynolds numbers, Re to reach the maximum enhancement compared to steady flow cases.. The entrainment between the core flow and recirculating flow enhances the heat transfer rates in a steady flow. But the pulsating flow forces the recirculating flow zones in the diverging-converging section of the channel wave to exchange the flud from the core flow region further and that is an additional mechanism to upgrade the rate of heat transfer comparing to the steady flow cases.
dc.description.sponsorshipoffice of Scientific Research Projects of Cukurova University [FDK-2016-6339]
dc.description.sponsorshipThe authors wish to thank the office of Scientific Research Projects of Cukurova University for funding this project under Contract no. FDK-2016-6339.
dc.identifier.doi10.1016/j.ijmecsci.2019.105268
dc.identifier.issn0020-7403
dc.identifier.issn1879-2162
dc.identifier.scopus2-s2.0-85074295426
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1016/j.ijmecsci.2019.105268
dc.identifier.urihttps://hdl.handle.net/20.500.14669/2584
dc.identifier.volume167
dc.identifier.wosWOS:000515213300011
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherPergamon-Elsevier Science Ltd
dc.relation.ispartofInternational Journal of Mechanical Sciences
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_20241211
dc.subjectHydrodynamics
dc.subjectHeat transfer enhancement
dc.subjectPIV
dc.subjectPulsating flow
dc.subjectWavy channel
dc.titleExperimental investigation of pulsating flow structures and heat transfer characteristics in sinusoidal channels
dc.typeArticle

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