Role of Vortical Structures on the Forced Convective Heat Transfer in Oscillation-Controlled Coaxial-Pipe Heat Exchanger

Takagi, Daisuke; Takeuchi, Shintaro; Kajishima, Takeo

doi:https://doi.org/10.1615/jenhheattransf.2016015399

アクセス数:253件（2024-05-13 03:09 集計）

固定URL: https://hdl.handle.net/11094/57201

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タイトル	Role of Vortical Structures on the Forced Convective Heat Transfer in Oscillation-Controlled Coaxial-Pipe Heat Exchanger
著者	著者名 Takagi, Daisuke
	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
	NRID 1000030185772 1000030185772 著者名 Kajishima, Takeo
キーワード等	Active technique
	Single-phase flow convection
	Double-pipe heat exchanger
	Computational modelling
内容	This is a pre-copyedited, author-produced PDF of an article accepted for publication in Journal of Enhanced Heat Transfer following peer review.
抄録	A numerical simulation of an oscillation-controlled heat-transport coaxial pipe is carried out for studying the flow structure and heat transport characteristics. The heat-transport pipe connects the hot and cold reservoirs, and the cold and hot fluids are discharged with the anti-phase reciprocal waves through circular and annular openings at the ends of the chamber, respectively. By changing the diameter ratio of the circular opening to the inner tube, a unidirectionally circulating flow is observed to develop spontaneously. The flow rate of the unidirectional current is found to be approximately inversely-proportional to the diameter ratio. While the amount of transported heat increases with the flow rate of the unidirectional current (especially when generating strong vortices at the edge of the inner tube) for both cases of thermally-insulated and fully-conductive inner wall, the optimal heat transport performance is attained (not in association with the strongest unidirectional flow) when making zero-averaged vorticity in the cold-end region. For the case of the conductive inner wall, the heat loss across the wall is suppressed with decreasing the diameter ratio, due to the development of the strong jet and radially surrounding shear layer that separate the outer hot fluid from the inner cold fluid.
出版者	Begellhouse
収録物名	Journal of Enhanced Heat Transfer
巻(号)	22(5)
ページ	365-389
刊行年月	2015
言語	英語
ハンドルURL	https://hdl.handle.net/11094/57201
PISSN	10655131
eISSN	15635074
NCID	AA11040782
関連情報 (isVersionOf)	DOI (出版社版) https://doi.org/10.1615/jenhheattransf.2016015399
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	Journal of Enhanced Heat Transfer. 2015, 22(5), p. 365-389
DC.title	Role of Vortical Structures on the Forced Convective Heat Transfer in Oscillation-Controlled Coaxial-Pipe Heat Exchanger
DC.creator	Takagi, Daisuke
	Takeuchi, Shintaro
	Kajishima, Takeo
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/jenhheattransf.2016015399
DC.subject	Active technique
	Single-phase flow convection
	Double-pipe heat exchanger
	Computational modelling
DC.description	This is a pre-copyedited, author-produced PDF of an article accepted for publication in Journal of Enhanced Heat Transfer following peer review.
DCTERMS.abstract	A numerical simulation of an oscillation-controlled heat-transport coaxial pipe is carried out for studying the flow structure and heat transport characteristics. The heat-transport pipe connects the hot and cold reservoirs, and the cold and hot fluids are discharged with the anti-phase reciprocal waves through circular and annular openings at the ends of the chamber, respectively. By changing the diameter ratio of the circular opening to the inner tube, a unidirectionally circulating flow is observed to develop spontaneously. The flow rate of the unidirectional current is found to be approximately inversely-proportional to the diameter ratio. While the amount of transported heat increases with the flow rate of the unidirectional current (especially when generating strong vortices at the edge of the inner tube) for both cases of thermally-insulated and fully-conductive inner wall, the optimal heat transport performance is attained (not in association with the strongest unidirectional flow) when making zero-averaged vorticity in the cold-end region. For the case of the conductive inner wall, the heat loss across the wall is suppressed with decreasing the diameter ratio, due to the development of the strong jet and radially surrounding shear layer that separate the outer hot fluid from the inner cold fluid.
DC.format	application/pdf
citation_title	Role of Vortical Structures on the Forced Convective Heat Transfer in Oscillation-Controlled Coaxial-Pipe Heat Exchanger
citation_author	Takagi, Daisuke
	Takeuchi, Shintaro
	Kajishima, Takeo
citation_publisher	Begellhouse
citation_language	英語
citation_date	2015
citation_journal_title	Journal of Enhanced Heat Transfer
citation_volume	22
citation_issue	5
citation_firstpage	365
citation_lastpage	389
citation_doi	https://doi.org/10.1615/jenhheattransf.2016015399
citation_public_url	https://hdl.handle.net/11094/57201

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