Electrical conductivity effect on MHD mixed convection of nanofluid flow over a backward-facing step; [导电性对纳米磁流体后向混合对流的影响]

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dc.contributor.authorSelimefendigil F.
dc.contributor.authorÖzcan Çoban S.
dc.contributor.authorÖztop H.F.
dc.date.accessioned2024-07-22T08:08:41Z
dc.date.available2024-07-22T08:08:41Z
dc.date.issued2019
dc.description.abstractIn this study, magneto-hydrodynamics (MHD) mixed convection effects of Al2O3-water nanofluid flow over a backward-facing step were investigated numerically for various electrical conductivity models of nanofluids. A uniform external magnetic field was applied to the flow and strength of magnetic field was varied with different values of dimensionless parameter Hartmann number (Ha=0, 10, 20, 30, 40). Three different electrical conductivity models were used to see the effects of MHD nanofluid flow. Besides, five different inclination angles between 0º~90º is used for the external magnetic field. The problem geometry is a backward-facing step which is used in many engineering applications where flow separation and reattachment phenomenon occurs. Mixed type convective heat transfer of backward-facing step was examined with various values of Richardson number (Ri=0.01, 0.1, 1, 10) and four different nanoparticle volume fractions (ø=0.01, 0.015, 0.020, 0.025) considering different electrical conductivity models. Finite element method via commercial code COMSOL was used for computations. Results indicate that the addition of nanoparticles enhanced heat transfer significantly. Also increasing magnetic field strength and inclination angle increased heat transfer rate. Effects of different electrical conductivity models were also investigated and it was observed that they have significant effects on the fluid flow and heat transfer characteristics in the presence of magnetic field. © 2019, Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature.
dc.identifier.DOI-ID10.1007/s11771-019-4076-9
dc.identifier.issn20952899
dc.identifier.urihttp://akademikarsiv.cbu.edu.tr:4000/handle/123456789/14476
dc.language.isoEnglish
dc.publisherCentral South University of Technology
dc.subjectAlumina
dc.subjectAluminum oxide
dc.subjectElectric conductivity
dc.subjectFacings
dc.subjectFlow separation
dc.subjectMagnetohydrodynamics
dc.subjectMixed convection
dc.subjectNanoparticles
dc.subjectBackward facing step
dc.subjectElectrical conductivity
dc.subjectEngineering applications
dc.subjectFlow separation and reattachments
dc.subjectFluid flow and heat transfers
dc.subjectMHD flow
dc.subjectNanofluids
dc.subjectNanoparticle volume fractions
dc.subjectNanofluidics
dc.titleElectrical conductivity effect on MHD mixed convection of nanofluid flow over a backward-facing step; [导电性对纳米磁流体后向混合对流的影响]
dc.typeArticle

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