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Entropy Generation and Natural Convection Flow of Hybrid Nanofluids in a Partially Divided Wavy Cavity Including Solid Blocks
Islamic Univ, Refrigerat & Air Conditioning Tech Engn Dept, Coll Tech Engn, Najaf 54001, Iraq.;Univ Kebangsaan Malaysia, Fac Sci & Technol, Dept Math Sci, Bangi Selangor 43600, Malaysia..ORCID iD: 0000-0002-2970-6600
Univ Kebangsaan Malaysia, Fac Sci & Technol, Dept Math Sci, Bangi Selangor 43600, Malaysia..
Univ Lyon, ECAM Lyon, LabECAM, F-69007 Lyon, France..
Ton Duc Thang Univ, Metamat Biomech & Multiphys Applicat Res Grp, Ho Chi Minh City 758307, Vietnam.;Ton Duc Thang Univ, Fac Sci Appl, Ho Chi Minh City 758307, Vietnam..ORCID iD: 0000-0003-0965-2358
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2020 (English)In: Energies, E-ISSN 1996-1073, Vol. 13, no 11, article id 2942Article in journal (Refereed) Published
Abstract [en]

The present investigation addressed the entropy generation, fluid flow, and heat transferregarding Cu-Al2O3-water hybrid nanofluids into a complex shape enclosure containing a hot-halfpartition were addressed. The sidewalls of the enclosure are made of wavy walls including coldisothermal temperature while the upper and lower surfaces remain insulated. The governingequations toward conservation of mass, momentum, and energy were introduced into the formof partial differential equations. The second law of thermodynamic was written for the friction andthermal entropy productions as a function of velocity and temperatures. The governing equationsoccurred molded into a non-dimensional pattern and explained through the finite element method.Outcomes were investigated for Cu-water, Al2O3-water, and Cu-Al2O3-water nanofluids to addressthe effect of using composite nanoparticles toward the flow and temperature patterns and entropygeneration. Findings show that using hybrid nanofluid improves the Nusselt number comparedto simple nanofluids. In the case of low Rayleigh numbers, such enhancement is more evident.Changing the geometrical aspects of the cavity induces different effects toward the entropy generationand Bejan number. Generally, the global entropy generation for Cu-Al2O3-water hybrid nanofluidtakes places between the entropy generation values regarding Cu-water and Al2O3-water nanofluids.

Place, publisher, year, edition, pages
MDPI AG , 2020. Vol. 13, no 11, article id 2942
Keywords [en]
complex wavy wall cavity, entropy generation, natural convection, hybrid nanofluid, solid blocks, finite element method
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-278808DOI: 10.3390/en13112942ISI: 000545401100269Scopus ID: 2-s2.0-85088385536OAI: oai:DiVA.org:kth-278808DiVA, id: diva2:1455710
Note

QC 20200728

Available from: 2020-07-28 Created: 2020-07-28 Last updated: 2023-08-28Bibliographically approved

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Saffari Pour, Mohsen

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