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Role of Rotating Cylinder toward Mixed Convection inside a Wavy Heated Cavity via Two-Phase Nanofluid Concept
Islam Univ, Coll Tech Engn, Refrigerat & Air Conditioning Tech Engn Dept, Najaf 54001, Iraq.;Univ Kebangsaan Malaysia, Fac Sci & Technol, Dept Math Sci, Ukm Bangi 43600, Selangor, Malaysia..ORCID iD: 0000-0002-2970-6600
Ton Duc Thang Univ, Metamat Mech Biomech & Multiphys Applicat Res Grp, Ho Chi Minh City 758307, Vietnam.;Ton Duc Thang Univ, Fac Appl Sci, Ho Chi Minh City 758307, Vietnam..
Islamic Azad Univ, Mahdishahr Branch, Dept Engn, Mahdishahr 7591535618, Iran..
Duy Tan Univ, Inst Res & Dev, Da Nang 550000, Vietnam.;Duy Tan Univ, Inst Theoret & Appl Res ITAR, Hanoi 100000, Vietnam..
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2020 (English)In: Nanomaterials, E-ISSN 2079-4991, Vol. 10, no 6, article id 1138Article in journal (Refereed) Published
Abstract [en]

The mixed convection two-phase flow and heat transfer of nanofluids were addressed within a wavy wall enclosure containing a solid rotating cylinder. The annulus area between the cylinder and the enclosure was filled with water-alumina nanofluid. Buongiorno's model was applied to assess the local distribution of nanoparticles in the host fluid. The governing equations for the mass conservation of nanofluid, nanoparticles, and energy conservation in the nanofluid and the rotating cylinder were carried out and converted to a non-dimensional pattern. The finite element technique was utilized for solving the equations numerically. The influence of the undulations, Richardson number, the volume fraction of nanoparticles, rotation direction, and the size of the rotating cylinder were examined on the streamlines, heat transfer rate, and the distribution of nanoparticles. The Brownian motion and thermophoresis forces induced a notable distribution of nanoparticles in the enclosure. The best heat transfer rate was observed for 3% volume fraction of alumina nanoparticles. The optimum number of undulations for the best heat transfer rate depends on the rotation direction of the cylinder. In the case of counterclockwise rotation of the cylinder, a single undulation leads to the best heat transfer rate for nanoparticles volume fraction about 3%. The increase of undulations number traps more nanoparticles near the wavy surface.

Place, publisher, year, edition, pages
MDPI , 2020. Vol. 10, no 6, article id 1138
Keywords [en]
mixed convection, thermophoresis and Brownian motion, wavy cavity, two-phase nanofluid concept, wavy heater, rotating circular cylinder
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-279218DOI: 10.3390/nano10061138ISI: 000554765300001PubMedID: 32526982Scopus ID: 2-s2.0-85088780602OAI: oai:DiVA.org:kth-279218DiVA, id: diva2:1458799
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QC 20200818

Available from: 2020-08-18 Created: 2020-08-18 Last updated: 2022-06-26Bibliographically approved

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Saffari Pour, Mohsen

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