NUMERICAL INVESTIGATION OF LAMINAR MIXED CONVECTION IN A SQUARE CROSS-SECTIONED CYLINDRICAL ANNULAR ENCLOSURE

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dc.contributor.authorTuran, Osman
dc.date.accessioned2026-02-12T21:04:49Z
dc.date.available2026-02-12T21:04:49Z
dc.date.issued2020
dc.departmentBursa Teknik Üniversitesi
dc.description.abstractSteady-state laminar mixed convection of Newtonian fluids in a square cross-sectioned cylindrical annular enclosure with rotating inner wall and heated top cover has been numerically analysed based on axisymmetric incompressible flow simulations. Richardson number, Reynolds number and r(i)/R effects on heat and momentum transport have been investigated for the range of Richardson number 0 <= Ri <= 1, Reynolds number 500 <= Re <= 2000 and 0.25 <= r(i)/R <= 8 at a representative value of Prandtl number (i.e Pr = 1.0). A scaling analysis has been also carried out in order to elucidate the possible influences of Reynolds, Richardson and Prandtl numbers and r(i)/R on the mean Nusselt number. It has been found that the mean Nusselt number (Nu) over bar demonstrates a monotonically decreasing trend with increasing Ri whereas (Nu) over bar increases with increasing r(i)/R and Re which is consistent with scaling estimation. It is also observed that the flow pattern in the case of purely forced convection (i.e Ri > 0) is significantly different from those in mixed convection (i.e Ri > 0). In the case of Ri = 0 (i.e. purely forced convection), a one-cell flow structure with two small vortexes on the top corners is observed for r(i)/ <= 1, whereas a second cell appears in the flow field for r(i)/R > 1 at Re = 1000. On the other hand, in the case of mixed convection (i.e Ri > 0), two-cell and four-cell flow structures occur in the flow field depending on Ri and r(i)/R for the range of Ri, Re and r(i)/R considered here at Pr = 1.0. Based these observations, a flow regime diagram has been proposed here for mixed convection (i.e Ri > 0) for the range of Ri, Re and r(i)/R analysed in this study.
dc.identifier.doi10.18186/thermal.670863
dc.identifier.endpage15
dc.identifier.issn2148-7847
dc.identifier.issue1
dc.identifier.scopusqualityQ2
dc.identifier.startpage1
dc.identifier.trdizinid368564
dc.identifier.urihttps://doi.org/10.18186/thermal.670863
dc.identifier.urihttps://search.trdizin.gov.tr/tr/yayin/detay/368564
dc.identifier.urihttps://hdl.handle.net/20.500.12885/6656
dc.identifier.volume6
dc.identifier.wosWOS:000505803700001
dc.identifier.wosqualityQ4
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakTR-Dizin
dc.language.isoen
dc.publisherYildiz Technical Univ
dc.relation.ispartofJournal of Thermal Engineering
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_WoS_20260212
dc.subjectMixed Convection
dc.subjectRotating Wall
dc.subjectRichardson number
dc.subjectCylindrical Enclosure
dc.subjectAnnular Enclosure
dc.titleNUMERICAL INVESTIGATION OF LAMINAR MIXED CONVECTION IN A SQUARE CROSS-SECTIONED CYLINDRICAL ANNULAR ENCLOSURE
dc.typeArticle

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