Heat transfer in natural convection with finite-sized particles considering thermal conductance due to inter­particle contacts

Takeuchi, Shintaro; Tsutsumi, Takaaki; Kajishima, Takeo; Kondo, Katsuya; Harada, Takeshi

doi:https://doi.org/10.1615/computthermalscien.2016014791

アクセス数:315件（2024-04-25 23:28 集計）

固定URL: https://hdl.handle.net/11094/57199

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ComputThermalScien_7_56_385	pdf	なし	1.40 MB	398	2016.07.06	author/著者版

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タイトル	Heat transfer in natural convection with finite-sized particles considering thermal conductance due to interparticle contacts
著者	NRID 1000050372628 1000050372628 ORCID 0000-0003-0091-4542 0000-0003-0091-4542 researchmap permalink 50372628 50372628 Scopus Author ID 35474283000 35474283000 著者名 Takeuchi, Shintaro
	著者名 Tsutsumi, Takaaki
	NRID 1000030185772 1000030185772 著者名 Kajishima, Takeo
	著者名 Kondo, Katsuya
	著者名 Harada, Takeshi
キーワード等	Multiphase flow
	Solid-dispersion
	Immersed solid object
	Heat transfer
	Thermal contact conduction
内容	This is a pre-copyedited, author-produced PDF of an article accepted for publication in Computational Thermal Sciences following peer review.
抄録	Heat transfer problem in solid-dispersed two-phase flow is numerically studied. Temperature gradient within the finite-sized particles and inter-particle heat flux due to collisions are considered, and those effects on the flow structure and heat transfer are discussed. The interaction between fluid and particles is treated by our original immersed solid approach For the conjugate heat transfer problems, to satisfy the thermal condition at the fluid-solid interface, our interfacial heat flux model is employed. Also, the interfacial flux model is extended to incorporate the heat conduction due to inter-particle contacts, based on 2-D and axisymmetric contact heat resistance solutions. The method is applied to 2-D and 3-D natural convection problems including multiple particles in a confined domain under relatively low Rayleigh numbers (10^4 ∼ 10^6). Heat transfer and particle behaviours are studied for different solid volume fractions (up to about 50%) and heat conductivity ratios (solid to fluid) ranging between 10^−3 and 10^3. Under high solid volume fraction conditions, the particles are observed to form densely concentrated regions, where heat flow tends to channel through the contacting points. In three-dimensional solid-dispersed flows, by decomposing the heat flux into the contributions of the convection and conduction, the change of the major heat transfer mode is studied for different solid volume fractions and conductivity ratios.
出版者	Begellhouse
収録物名	Computational Thermal Sciences
巻(号)	7(5, 6)
ページ	385-404
刊行年月	2015
言語	英語
ハンドルURL	https://hdl.handle.net/11094/57199
PISSN	19402503
eISSN	19402554
NCID	AA12428816
関連情報 (isVersionOf)	DOI (出版社版) https://doi.org/10.1615/computthermalscien.2016014791
アクセス権	open access
出版タイプ	Accepted Manuscript
カテゴリ	学術雑誌論文 Journal Article

資源タイプ	学術雑誌論文
ローカル資源タイプ	学術雑誌論文
DCMI資源タイプ	text
DCTERMS.bibliographicCitation	Computational Thermal Sciences. 2015, 7(5, 6), p. 385-404
DC.title	Heat transfer in natural convection with finite-sized particles considering thermal conductance due to interparticle contacts
DC.creator	Takeuchi, Shintaro
	Tsutsumi, Takaaki
	Kajishima, Takeo
	Kondo, Katsuya
	Harada, Takeshi
DC.publisher	Begellhouse
DC.language' scheme='DCTERMS.RFC1766	英語
DC.type' scheme='DCTERMS.DCMIType	text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2015
DC.identifier	https://doi.org/10.1615/computthermalscien.2016014791
DC.subject	Multiphase flow
	Solid-dispersion
	Immersed solid object
	Heat transfer
	Thermal contact conduction
DC.description	This is a pre-copyedited, author-produced PDF of an article accepted for publication in Computational Thermal Sciences following peer review.
DCTERMS.abstract	Heat transfer problem in solid-dispersed two-phase flow is numerically studied. Temperature gradient within the finite-sized particles and inter-particle heat flux due to collisions are considered, and those effects on the flow structure and heat transfer are discussed. The interaction between fluid and particles is treated by our original immersed solid approach For the conjugate heat transfer problems, to satisfy the thermal condition at the fluid-solid interface, our interfacial heat flux model is employed. Also, the interfacial flux model is extended to incorporate the heat conduction due to inter-particle contacts, based on 2-D and axisymmetric contact heat resistance solutions. The method is applied to 2-D and 3-D natural convection problems including multiple particles in a confined domain under relatively low Rayleigh numbers (10^4 ∼ 10^6). Heat transfer and particle behaviours are studied for different solid volume fractions (up to about 50%) and heat conductivity ratios (solid to fluid) ranging between 10^−3 and 10^3. Under high solid volume fraction conditions, the particles are observed to form densely concentrated regions, where heat flow tends to channel through the contacting points. In three-dimensional solid-dispersed flows, by decomposing the heat flux into the contributions of the convection and conduction, the change of the major heat transfer mode is studied for different solid volume fractions and conductivity ratios.
DC.format	application/pdf
citation_title	Heat transfer in natural convection with finite-sized particles considering thermal conductance due to interparticle contacts
citation_author	Takeuchi, Shintaro
	Tsutsumi, Takaaki
	Kajishima, Takeo
	Kondo, Katsuya
	Harada, Takeshi
citation_publisher	Begellhouse
citation_language	英語
citation_date	2015
citation_journal_title	Computational Thermal Sciences
citation_volume	7
citation_issue	5, 6
citation_firstpage	385
citation_lastpage	404
citation_doi	https://doi.org/10.1615/computthermalscien.2016014791
citation_public_url	https://hdl.handle.net/11094/57199

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