Investigation of flow characteristics around a sphere placed in a boundary layer over a flat plate

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dc.contributor.authorÖzgören, Muammer
dc.contributor.authorOkbaz, Abdulkerim
dc.contributor.authorDoğan, Sercan
dc.contributor.authorŞahin, Beşir
dc.contributor.authorAkıllı, Hüseyin
dc.date.accessioned2020-03-26T18:42:15Z
dc.date.available2020-03-26T18:42:15Z
dc.date.issued2013
dc.departmentSelçuk Üniversitesien_US
dc.description.abstractFlow characteristics around a sphere located over a smooth flat plate were experimentally investigated using dye visualization and PIV technique. The sphere was embedded in a turbulent boundary layer with a thickness of 63 mm which was larger than the sphere diameter of D = 42.5 mm. Instantaneous and time-averaged flow patterns in the wake region of the sphere were examined from the point of flow physics for different sphere locations in the range of 0 <= G/D <= 1.5 where G was the space between the bottom point of the sphere and the flat plate surface. Reynolds numbers with a range of 2500 <= Re <= 10000 based on the free-stream velocity while the velocity distributions over the plate surface are the developed turbulent boundary layer condition attained by using a tripwire. Distributions of velocity fluctuations, patterns of sectional streamlines, vorticity contours, velocity fields, turbulent kinetic energy and corresponding Reynolds stress correlations are obtained using PIV data. It was found that a jet-like flow stimulated the flow entrainment between the core and wake regions as a function of the sphere locations. The gap ratio has a strong influence on the flow structure of the wake-boundary layer interaction and the variation of the reattachment location of the separated flow from the plate surface. The time-averaged flow patterns yield asymmetric structures downstream of the sphere due to the effect of the boundary layer flow distribution. (C) 2012 Elsevier Inc. All rights reserved.en_US
dc.description.sponsorshipScientific and Technological Research Council of Turkey (TUBITAK)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [109R028]; Scientific Research Projects Office of Cukurova UniversityCukurova University [AAP20025]; Selcuk University's Scientific Research Project OfficeSelcuk University; DPT ProjectTurkiye Cumhuriyeti Kalkinma Bakanligi [2009K12180]en_US
dc.description.sponsorshipThe authors would like to acknowledge the funding of The Scientific and Technological Research Council of Turkey (TUBITAK) under Contract No. 109R028, Scientific Research Projects Office of Cukurova University Contract No. AAP20025, Selcuk University's Scientific Research Project Office and DPT Project Contract No. 2009K12180.en_US
dc.identifier.doi10.1016/j.expthermflusci.2012.05.014en_US
dc.identifier.endpage74en_US
dc.identifier.issn0894-1777en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage62en_US
dc.identifier.urihttps://dx.doi.org/10.1016/j.expthermflusci.2012.05.014
dc.identifier.urihttps://hdl.handle.net/20.500.12395/29586
dc.identifier.volume44en_US
dc.identifier.wosWOS:000316515400006en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherELSEVIER SCIENCE INCen_US
dc.relation.ispartofEXPERIMENTAL THERMAL AND FLUID SCIENCEen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.selcuk20240510_oaigen_US
dc.subjectBoundary layeren_US
dc.subjectFlow visualizationen_US
dc.subjectReattachmenten_US
dc.subjectSphereen_US
dc.subjectPIVen_US
dc.subjectTurbulenceen_US
dc.subjectVorticityen_US
dc.subjectWakeen_US
dc.titleInvestigation of flow characteristics around a sphere placed in a boundary layer over a flat plateen_US
dc.typeArticleen_US

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