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윤애정

Yoon, Aejung
Advanced Thermal Energy Lab.
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DC Field Value Language
dc.citation.number 1 -
dc.citation.title INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW -
dc.citation.volume 64 -
dc.contributor.author Reddy, N.Keerthi -
dc.contributor.author Yoon, Aejung -
dc.contributor.author Mani, Sankar -
dc.contributor.author Swamy, H.A.Kumara -
dc.date.accessioned 2023-12-21T11:42:35Z -
dc.date.available 2023-12-21T11:42:35Z -
dc.date.created 2023-10-30 -
dc.date.issued 2024-01 -
dc.description.abstract Purpose
Natural convection in finite enclosures is a common phenomenon in various thermal applications. To provide the thermal design guidelines, this study aims to numerically explore the potential of using internal baffles and nanofluids to either enhance or suppress heat transport in a vertical annulus. Furthermore, the annular-shaped enclosure is filled with aqueous-silver nanofluid and the effects of five distinct nanoparticle shapes are examined. In addition, the influence of baffle design parameters, including baffle position, thickness and length, is thoroughly analyzed.

Design/methodology/approach
The finite difference method is used in conjunction with the alternating direction implicit and successive line over relaxation techniques to solve nonlinear and coupled partial differential equations. The single phase model is used for nanofluid which is considered as a homogeneous fluid with improved thermal properties. The independence tests are carried out for assessing the sufficiency of grid size and time step for obtaining results accurately.

Findings
The baffle dimension parameters and nanoparticle shape exhibit significant impact on the convective flow and heat transfer characteristics, leading to the following results: sphere- and blade-shaped nanoparticles demonstrate around 30% enhancement in the heat transport capability compared with platelet-shaped nanoparticles, which exhibit the least. When considering the baffle design parameter, either a decrease in the baffle length and thickness or an increase in baffle height leads to an improvement in heat transport rate. Consequently, a threefold increase in baffle height yields a 40% improvement in thermal performance.

Originality/value
Understanding the impact of nanoparticle shapes and baffle design parameters on flow and thermal behavior will enable engineers to provide valuable insight on thermal management and overall system efficiency. Therefore, the current work focuses on exploring buoyant nanofluid flow and thermal mechanism in a baffled annular-shaped enclosure. Specifically, an internal baffle that exhibits conductive heat transfer through it is considered, and the impact of baffle dimensions (thickness, length and position) on the fluid flow behavior and thermal characteristics is investigated. In addition, the current study also addresses the influence of five distinct nanoparticle shapes (e.g. spherical, cylindrical, platelet, blade and brick) on the flow and thermal behavior in the baffled annular geometry. In addition to deepening the understanding of nanofluid behavior in a baffled vertical annulus, the current study contributes to the ongoing advancements in thermal applications by providing certain guidelines to design application-specific enclosures.
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dc.identifier.bibliographicCitation INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW, v.64, no.1 -
dc.identifier.doi 10.1108/HFF-09-2023-0524 -
dc.identifier.issn 0961-5539 -
dc.identifier.scopusid 2-s2.0-85174839076 -
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/66084 -
dc.identifier.wosid 001087176900001 -
dc.language 영어 -
dc.publisher Emerald Group Publishing Ltd. -
dc.title Numerical investigation of nanofluid buoyant flow behavior and heat transfer characteristics in annular-shaped enclosure with internal baffle -
dc.type Article -
dc.description.isOpenAccess FALSE -
dc.relation.journalWebOfScienceCategory Thermodynamics;Mathematics, Interdisciplinary Applications;Mechanics -
dc.relation.journalResearchArea Thermodynamics;Mathematics;Mechanics -
dc.type.docType Article -
dc.description.journalRegisteredClass scie -
dc.description.journalRegisteredClass scopus -
dc.subject.keywordAuthor Nanofluid -
dc.subject.keywordAuthor Natural convection -
dc.subject.keywordAuthor Nanoparticle shape -
dc.subject.keywordAuthor Annular-shaped enclosure -
dc.subject.keywordAuthor Internal baffle design -
dc.subject.keywordPlus LAMINAR NATURAL-CONVECTION -
dc.subject.keywordPlus THERMAL BARRIER COATINGS -
dc.subject.keywordPlus CU-WATER NANOFLUID -

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