Effect of finned structure on critical heat flux (CHF) in downward-face pool boiling

Critical heat flux (CHF) plays an important role as the upper limit of heat dissipation process during the in-vessel reactor external reactor vessel cooling (IVR-ERVC). IVR-ERVC is regarded as a very effective way to release the decay heat after the core melt. This severe accident mitigation counter...

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Autores principales:	Kai WANG, Nejdet ERKAN, Koji OKAMOTO
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2020
Materias:	critical heat flux pool boiling down-ward face heat transfer finned structure Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/07a04e7ce8c34e62941654f26e6b12e6
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spelling	oai:doaj.org-article:07a04e7ce8c34e62941654f26e6b12e62021-11-29T05:56:30ZEffect of finned structure on critical heat flux (CHF) in downward-face pool boiling2187-974510.1299/mej.19-00500https://doaj.org/article/07a04e7ce8c34e62941654f26e6b12e62020-02-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/7/3/7_19-00500/_pdf/-char/enhttps://doaj.org/toc/2187-9745Critical heat flux (CHF) plays an important role as the upper limit of heat dissipation process during the in-vessel reactor external reactor vessel cooling (IVR-ERVC). IVR-ERVC is regarded as a very effective way to release the decay heat after the core melt. This severe accident mitigation countermeasure has already been applied in some advanced PWRs and is considered to be used in some advanced BWRs as well. In this paper, experiments of the macro-fin structure positioned on a slope with 5° and 10° downward inclination angle were carried out. The results of the copper bar experiments were then analyzed and compared with the results obtained from a copper bare block experiments which were conducted previously at the same test facility. It was found that the CHF of the finned structure decreased compared with that of the bare surface. This shows that the current CHF data of the bare surface cannot be used directly to the design of new advanced BWRs. The hot/dry spot theory designated for the copper bar was brought up with an attempt to explain the difference of copper bare block and copper bar. Results show that using this theory can explain the decrease of CHF of the copper bar.Kai WANGNejdet ERKANKoji OKAMOTOThe Japan Society of Mechanical Engineersarticlecritical heat fluxpool boilingdown-ward faceheat transferfinned structureMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 7, Iss 3, Pp 19-00500-19-00500 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	critical heat flux pool boiling down-ward face heat transfer finned structure Mechanical engineering and machinery TJ1-1570
spellingShingle	critical heat flux pool boiling down-ward face heat transfer finned structure Mechanical engineering and machinery TJ1-1570 Kai WANG Nejdet ERKAN Koji OKAMOTO Effect of finned structure on critical heat flux (CHF) in downward-face pool boiling
description	Critical heat flux (CHF) plays an important role as the upper limit of heat dissipation process during the in-vessel reactor external reactor vessel cooling (IVR-ERVC). IVR-ERVC is regarded as a very effective way to release the decay heat after the core melt. This severe accident mitigation countermeasure has already been applied in some advanced PWRs and is considered to be used in some advanced BWRs as well. In this paper, experiments of the macro-fin structure positioned on a slope with 5° and 10° downward inclination angle were carried out. The results of the copper bar experiments were then analyzed and compared with the results obtained from a copper bare block experiments which were conducted previously at the same test facility. It was found that the CHF of the finned structure decreased compared with that of the bare surface. This shows that the current CHF data of the bare surface cannot be used directly to the design of new advanced BWRs. The hot/dry spot theory designated for the copper bar was brought up with an attempt to explain the difference of copper bare block and copper bar. Results show that using this theory can explain the decrease of CHF of the copper bar.
format	article
author	Kai WANG Nejdet ERKAN Koji OKAMOTO
author_facet	Kai WANG Nejdet ERKAN Koji OKAMOTO
author_sort	Kai WANG
title	Effect of finned structure on critical heat flux (CHF) in downward-face pool boiling
title_short	Effect of finned structure on critical heat flux (CHF) in downward-face pool boiling
title_full	Effect of finned structure on critical heat flux (CHF) in downward-face pool boiling
title_fullStr	Effect of finned structure on critical heat flux (CHF) in downward-face pool boiling
title_full_unstemmed	Effect of finned structure on critical heat flux (CHF) in downward-face pool boiling
title_sort	effect of finned structure on critical heat flux (chf) in downward-face pool boiling
publisher	The Japan Society of Mechanical Engineers
publishDate	2020
url	https://doaj.org/article/07a04e7ce8c34e62941654f26e6b12e6
work_keys_str_mv	AT kaiwang effectoffinnedstructureoncriticalheatfluxchfindownwardfacepoolboiling AT nejdeterkan effectoffinnedstructureoncriticalheatfluxchfindownwardfacepoolboiling AT kojiokamoto effectoffinnedstructureoncriticalheatfluxchfindownwardfacepoolboiling
_version_	1718407567329198080

Effect of finned structure on critical heat flux (CHF) in downward-face pool boiling

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