MHD mixed convection of nanofluid in a cubic cavity with a conductive partition for various nanoparticle shapes

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dc.contributor.authorSelimefendigil F.
dc.contributor.authorÖztop H.F.
dc.contributor.authorChamkha A.J.
dc.date.accessioned2024-07-22T08:08:12Z
dc.date.available2024-07-22T08:08:12Z
dc.date.issued2019
dc.description.abstractPurpose: This paper aims to numerically examine the mixed convection of SiO2-water nanofluid flow in a three-dimensional (3D) cubic cavity with a conductive partition considering various shapes of the particles (spherical, cylindrical, blade, brick). The purpose is to analyze the effects of various pertinent parameters such as Richardson number (between 0.1 and 10), Hartmann number (between 0 and 10), solid nanoparticle volume fraction (between 0 and 0.04), particle shape (spherical, cylindrical, blade, brick) and different heights and lengths of the conductive partition on the fluid flow and heat transfer characteristics. Design/methodology/approach: The numerical simulation was performed by using Galerkin-weighted residual finite element method for various values of Richardson number, Hartmann number, solid nanoparticle volume fraction, particle shape (spherical, cylindrical, blade, brick) and different heights and lengths of the conductive partition. Two models for the average Nusselt number were proposed for nanofluids with spherical and cylindrical particle by using multi-layer feed-forward neural networks. Findings: It was observed that the average Nusselt number reduces for higher values of Richardson number and Hartmann number, while enhances for higher values of nanoparticle volume fraction. Among various types of particle shapes, blade ones perform the worst and cylindrical ones perform the best in terms of heat transfer enhancement, but this is not significant which is less than 3 per cent. The average Nusselt number deteriorates by about 6.53per cent for nanofluid at the highest volume fraction of spherical particle shapes, but it is 11.75per cent for the base fluid when Hartmann number is increased from 0 to 10. Conductive partition geometrical parameters (length and height) do not contribute to much to heat transfer process for the 3D cavity, except for the case when height of the partition reaches 0.8 times the height of the cubic cavity, the average Nusselt number value reduces by about 25per cent both for base fluid and for nanofluid when compared to case with cavity height which is 0.2 times the height of the cubic cavity. Originality/value: Based on the literature survey, a 3D configuration for MHD mixed convection of nanofluid flow in a cavity with a conductive partition considering the effects of various particle shapes has never been studied in the literature. This study is a first attempt to use a conductive partition with nanofluid of various particle shapes to affect the fluid flow and heat transfer characteristics in a 3D cubic cavity under the influence of magnetic field. Partial or all findings of this study could be used for the design and optimization of realistic 3D thermal configurations that are encountered in practice and some of the applications were already mentioned above. In this study, thermal performance of the system was obtained in terms of average heat transfer coefficient along the hot surface, and it is modeled with multi-layer feed-forward neural networks. © 2019, Emerald Publishing Limited.
dc.identifier.DOI-ID10.1108/HFF-04-2018-0176
dc.identifier.issn09615539
dc.identifier.urihttp://akademikarsiv.cbu.edu.tr:4000/handle/123456789/14287
dc.language.isoEnglish
dc.publisherEmerald Publishing
dc.subjectBrick
dc.subjectFlow of fluids
dc.subjectHeat transfer coefficients
dc.subjectMagnetohydrodynamics
dc.subjectMixed convection
dc.subjectNanofluidics
dc.subjectNanoparticles
dc.subjectNatural convection
dc.subjectNumerical methods
dc.subjectNusselt number
dc.subjectRadial basis function networks
dc.subjectSilica
dc.subjectSpheres
dc.subjectVolume fraction
dc.subjectCubic cavities
dc.subjectDifferent heights
dc.subjectHartmann numbers
dc.subjectMHD flow
dc.subjectNanofluid flow
dc.subjectNanofluids
dc.subjectNanoparticle volume fractions
dc.subjectParticle shape
dc.subjectRichardson number
dc.subjectSolid nanoparticles
dc.subjectFinite element method
dc.titleMHD mixed convection of nanofluid in a cubic cavity with a conductive partition for various nanoparticle shapes
dc.typeArticle

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