Flow boiling experiments for CHF evaluation under downward-facing heating including flow visualization: Effects of pressure, orientation, mass flux, and local quality

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In-vessel retention through external reactor vessel cooling (IVR-ERVC) is a type of severe accident mitigation strategy. Previous works have evaluated the ERVC performance limit with critical heat flux (CHF). However, since each experimental parameter was not independently controlled, there is a limit to evaluate the effect of each parameter on CHF and their interactions. In this study, parameters were independently controlled to systematically evaluate the effects of each one on CHF. Mass flux, orientation angle, pressure, and local quality were selected as the experimental parameters, in ranges determined from the severe accident conditions in which ERVC is employed. Experiments particularly considered low orientation and pressurization conditions that have not been actively considered previously. Simultaneously, flow-visualization was performed to observe the generation and behavior of vapors according to the parameter changes to ultimately interpret the CHF tendencies. Through the parametric experiments, it was confirmed that vapor behavior directly causes CHF occurrence.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2022-06
Language
English
Article Type
Article
Citation

ANNALS OF NUCLEAR ENERGY, v.171

ISSN
0306-4549
DOI
10.1016/j.anucene.2022.108994
URI
http://hdl.handle.net/10203/292395
Appears in Collection
NE-Journal Papers(저널논문)
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