Modeling of spacer influence on post-dryout heat transfer in heated channel
2006 (English)In: Proceedings of the 14th International Conference on Nuclear Engineering, 2006Conference paper (Refereed)
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
Accident prevention, Light water reactors, Mathematical models, Nuclear reactors
Research subject SRA - Energy
IdentifiersURN: urn:nbn:se:kth:diva-80438ISBN: 978-079183783-2OAI: oai:DiVA.org:kth-80438DiVA: diva2:496324
QC 201202282012-02-092012-02-092012-02-28Bibliographically approved