Stability of Unsteady Mixed Convection in a Horizontal Concentric Annulus

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dc.authoridKahveci, Kamil/0000-0003-2492-8690
dc.authorwosidKahveci, Kamil/A-2954-2016
dc.contributor.authorKahveci, K.
dc.date.accessioned2024-06-12T11:08:39Z
dc.date.available2024-06-12T11:08:39Z
dc.date.issued2016
dc.departmentTrakya Üniversitesien_US
dc.description.abstractIn this study, stability of unsteady mixed convection in a horizontal annulus between two concentric cylinders was investigated numerically. The surfaces of the cylinders were considered to be at fixed temperatures and it was assumed that the hot inner cylinder is rotating at a constant angular velocity. The buoyancy forces were formulated utilizing the Boussinesq approximation. The governing equations of fluid flow and heat transfer in the annulus were solved with a finite element method for different values of the geometric (radius ratio) and transport parameters (Rayleigh number and Reynolds number). Development of the convective flow and heat transfer was expressed by the average-Nusselt number for the outer cylinder. The results show that, for a narrow gap annulus, convective flow induces flow bifurcation and becomes unstable for high values of the Rayleigh number. Flow becomes more unstable with an increase in the Reynolds number. For a wide gap annulus, flow is stable for all values of the Rayleigh number if the rotation effects are small. On the other hand, convective flow becomes unstable for the modest and high values of the Ra number with an increase in the Re number.en_US
dc.identifier.endpage2147en_US
dc.identifier.issn1735-3572
dc.identifier.issn1735-3645
dc.identifier.issue5en_US
dc.identifier.scopus2-s2.0-84988710012en_US
dc.identifier.scopusqualityQ3en_US
dc.identifier.startpage2141en_US
dc.identifier.urihttps://hdl.handle.net/20.500.14551/22495
dc.identifier.volume9en_US
dc.identifier.wosWOS:000383413800005en_US
dc.identifier.wosqualityN/Aen_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherIsfahan Univ Technologyen_US
dc.relation.ispartofJournal Of Applied Fluid Mechanicsen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectMixed Convectionen_US
dc.subjectConcentric Annulusen_US
dc.subjectStabilityen_US
dc.subjectBifurcationen_US
dc.subjectNusselt Numberen_US
dc.subjectRayleigh Numberen_US
dc.subjectNatural-Convectionen_US
dc.subjectHeat-Transferen_US
dc.subjectCylindersen_US
dc.subjectNanofluidsen_US
dc.subjectFlowen_US
dc.titleStability of Unsteady Mixed Convection in a Horizontal Concentric Annulusen_US
dc.typeArticleen_US

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