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Modeling of spacer influence on post-dryout heat transfer in heated channels
KTH, School of Engineering Sciences (SCI), Physics, Reactor Technology.ORCID iD: 0000-0001-5595-1952
2006 (English)In: International Conference on Nuclear Engineering, Proceedings, ICONE Volume 2006, 2006, 7p, 2006Conference paper (Refereed)
Abstract [en]

Post-dryout heat transfer plays an important role in safe and economical operations of Light Water Reactors (LWR). This type of heat transfer is avoided under normal operational conditions of nuclear reactors; however, it may occur in transient or accidential situations. To estimate the risk of clad damages due to increase of temperature associated with the occurrence of post-dryout, it is necessary to properly model heat transfer processes under such conditions. The influence of various parameters on heat transfer downstream of spacer has been investigated. It is concluded that heat transfer enhancement due to spacers is largely under-predicted for flows with relatively low quality. For such flows the effect of droplets impinging heated walls is significant and must properly be taken into account. The phenomenological model presented in this paper shows a superior accuracy over correlations and presents a potential to capture the phenomenon of rewetting that occurs downstream of spacers.

Place, publisher, year, edition, pages
, International Conference on Nuclear Engineering, Proceedings, ICONE, 2006
Keyword [en]
Clad damages, Heated walls, Rewetting, Spacers, Accident prevention, Light water reactors, Mathematical models, Nuclear reactors, Heat transfer
National Category
Atom and Molecular Physics and Optics
URN: urn:nbn:se:kth:diva-155871DOI: 10.1115/ICONE14-89713ScopusID: 2-s2.0-33845734076ISBN: 0791837831ISBN: 9780791837832OAI: diva2:764012
Fourteenth International Conference on Nuclear Engineering 2006, ICONE 14, 17 July 2006 through 20 July 2006, Miami, FL

QC 20141118

Available from: 2014-11-18 Created: 2014-11-13 Last updated: 2014-11-18Bibliographically approved

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Anglart, Henryk
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ReferencesLink to record
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