The effects of bottom wall heating on mixed convection of yield stress fluids in cylindrical enclosures with a rotating end wall

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dc.authorid0000-0003-3421-2020en_US
dc.contributor.authorTuran, Osman
dc.contributor.authorChakraborty, Nilanjan
dc.date.accessioned2021-03-20T20:13:15Z
dc.date.available2021-03-20T20:13:15Z
dc.date.issued2018
dc.departmentBTÜ, Mühendislik ve Doğa Bilimleri Fakültesi, Makine Mühendisliği Bölümüen_US
dc.description.abstractSteady-state laminar mixed convection of Bingham fluids in cylindrical enclosures with a rotating top cover has been numerically analysed for the configuration where the bottom cover is kept at a higher temperature than the rotating top cover. The numerical investigations have been carried out based on steady-state axisymmetric incompressible flow simulations for a range of different values Reynolds, Richardson, and Prandtl number given by 500 <= Re 3000, 0 <= Ri <= 1 and 10 <= Pr <= 500 respectively. The aspect ratio (i.e. height: radius = AR = H/R) of the cylindrical container is considered to be unity (i.e. AR = H/R = 1). The mean Nusselt number (Nu) over bar has been found to decrease sharply with increasing Bn owing to flow resistance arising from yield stress, but subsequently (Nu) over bar asymptotically approaches a value of unity, which is indicative of a conduction-driven transport. In addition, the mean Nusselt number (Nu) over bar has been found to increase with increasing Reynolds number due to the strengthening of advective transport. However, the mean Nusselt number (Nu) over bar exhibits a non-monotonic trend (i.e. increases with increasing Ri for small values of Richardson number before showing a weak decreasing trend) with increasing Ri for Newtonian fluid (i.e. Bn = 0), whereas (Nu) over bar increases with increasing Ri for small values of Richardson number before becoming a weak function of Ri for Bingham fluids. A step change in the mean Nusselt number has also been observed with an increase in Richardson number for some Bingham number values due to a change in flow pattern. The influences of Prandtl, Reynolds, Richardson, and Bingham numbers on the mean Nusselt number have been explained in detail based on both physical and scaling arguments. The simulation data and scaling relations have been utilised to propose a correlation for the mean Nusselt number, which has been shown to capture the numerical findings satisfactorily for the parameter range considered here. 2018 Elsevier Ltd. All rights reserved.en_US
dc.description.sponsorshipNewton Research Collaboration Programmeen_US
dc.description.sponsorshipThis study was supported by Newton Research Collaboration Programme and is hereby gratefully acknowledged.en_US
dc.identifier.doi10.1016/j.ijheatmasstransfer.2018.01.016en_US
dc.identifier.endpage774en_US
dc.identifier.issn0017-9310
dc.identifier.issn1879-2189
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage759en_US
dc.identifier.urihttp://doi.org/10.1016/j.ijheatmasstransfer.2018.01.016
dc.identifier.urihttps://hdl.handle.net/20.500.12885/827
dc.identifier.volume121en_US
dc.identifier.wosWOS:000430030300066en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.institutionauthorTuran, Osman
dc.language.isoenen_US
dc.publisherPergamon-Elsevier Science Ltden_US
dc.relation.ispartofInternational Journal Of Heat And Mass Transferen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectMixed convectionen_US
dc.subjectBingham fluiden_US
dc.subjectRotating end wallen_US
dc.subjectReynolds numberen_US
dc.subjectPrandtl numberen_US
dc.subjectRichardson numberen_US
dc.subjectBingham numberen_US
dc.titleThe effects of bottom wall heating on mixed convection of yield stress fluids in cylindrical enclosures with a rotating end wallen_US
dc.typeArticleen_US

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