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Influence of nanofluids on mixed convective heat transfer over a horizontal backward-facing step

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dc.citedby40
dc.contributor.authorMohammed H.A.en_US
dc.contributor.authorAl-aswadi A.A.en_US
dc.contributor.authorAbu-Mulaweh H.I.en_US
dc.contributor.authorShuaib N.H.en_US
dc.contributor.authorid15837504600en_US
dc.contributor.authorid36241331700en_US
dc.contributor.authorid7003564408en_US
dc.contributor.authorid13907934500en_US
dc.date.accessioned2023-12-29T07:48:41Z
dc.date.available2023-12-29T07:48:41Z
dc.date.issued2011
dc.description.abstractPredictions are reported for laminar mixed convection using various types of nanofluids over a horizontal backward-facing step in a duct, in which the upstream wall and the step are considered adiabatic surfaces, while the downstream wall from the step is heated to a uniform temperature that is higher than the inlet fluid temperature. The straight wall that forms the other side of the duct is maintained at constant temperature equivalent to the inlet fluid temperature. Eight different types of nanoparticles, Au, Ag, Al2O3, Cu, CuO, diamond, SiO2, and TiO2, with 5% volume fraction are used. The conservation equations along with the boundary conditions are solved using the finite volume method. Results presented in this paper are for a step height of 4.9 mm and an expansion ratio of 1.942, while the total length in the downstream of the step is 0.5 m. The Reynolds number is in the range of 75 ? Re ? 225. The downstream wall was fixed at a uniform wall temperature in the range of 0 ? ?T ? 30 �C which is higher than the inlet flow temperature. Results reveal that there is a primary recirculation region for all nanofluids behind the step. It is noticed that nanofluids without secondary recirculation region have a higher Nusselt number and it increases with Prandtl number decrement. On the other hand, nanofluids with secondary recirculation regions are found to have a lower Nusselt number. Diamond nanofluid has the highest Nusselt number in the primary recirculation region, while SiO2 nanofluid has the highest Nusselt number downstream of the primary recirculation region. The skin friction coefficient increases as the temperature difference increases and the Reynolds number decreases. � 2011 Wiley Periodicals, Inc.en_US
dc.description.natureFinalen_US
dc.identifier.doi10.1002/htj.20344
dc.identifier.epage307
dc.identifier.issue4
dc.identifier.scopus2-s2.0-79956150535
dc.identifier.spage287
dc.identifier.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-79956150535&doi=10.1002%2fhtj.20344&partnerID=40&md5=33ef7e2e3691ccbb3265d19e5779d624
dc.identifier.urihttps://irepository.uniten.edu.my/handle/123456789/30510
dc.identifier.volume40
dc.pagecount20
dc.sourceScopus
dc.sourcetitleHeat Transfer - Asian Research
dc.subjectHeat transfer enhancement
dc.subjectHorizontal backward-facing step
dc.subjectMixed convection
dc.subjectNanofluids
dc.subjectFacings
dc.subjectFinite volume method
dc.subjectFriction
dc.subjectGold
dc.subjectInlet flow
dc.subjectMixed convection
dc.subjectNusselt number
dc.subjectReynolds number
dc.subjectSilicon compounds
dc.subjectSilver
dc.subjectSupersonic flow
dc.subjectTitanium dioxide
dc.subjectBackward facing step
dc.subjectConservation equations
dc.subjectConstant temperature
dc.subjectExpansion ratio
dc.subjectFlow temperature
dc.subjectFluid temperatures
dc.subjectHeat Transfer enhancement
dc.subjectHorizontal backward-facing step
dc.subjectMixed convective
dc.subjectNano-fluid
dc.subjectNanofluids
dc.subjectRecirculation regions
dc.subjectSkin friction coefficient
dc.subjectStep height
dc.subjectTemperature differences
dc.subjectTiO
dc.subjectTotal length
dc.subjectUniform temperature
dc.subjectWall temperatures
dc.subjectNanofluidics
dc.titleInfluence of nanofluids on mixed convective heat transfer over a horizontal backward-facing stepen_US
dc.typeArticleen_US
dspace.entity.typePublication
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