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Multiphase Science and Technology
SJR: 0.183 SNIP: 0.483 CiteScore™: 0.5

ISSN 印刷: 0276-1459
ISSN オンライン: 1943-6181

Multiphase Science and Technology

DOI: 10.1615/MultScienTechn.v19.i4.40
pages 363-372

VISUALIZATION OF DRYOUT PHENOMENON AND LIQUID FILM BEHAVIOR USING A SINGLE SUBCHANNEL OF A TIGHT LATTICE BUNDLE

Miyuki Akiba
Toshiba Corporation, Yokohama, Kanagawa, Japan
Shinichi Morooka
Toshiba Corporation, Yokohama, Kanagawa, Japan
Junji Mimatsu
Dept. of Mechanical Engineering, Gifu University, Gifu, Japan
Sinji Sakai
Gifu University, Gifu, Japan
Akira Inoue
Research Laboratory of Nuclear Reactor, Tokyo Institute of Technology, Tokyo, Japan

要約

The development of fast neutron spectrum boiling water reactors requires understanding of flow behavior in a tight lattice bundle. We conducted experiments to visualize single-channel flow under atmospheric conditions and to measure the critical heat flux (CHF) location and liquid film behavior. The observed flow pattern in the tight lattice was in agreement with the Hewitt-Roberts flow pattern map. CHF occurred at the wider rod gap location. Furthermore, the liquid film flow rate at this location was less than that at the narrow rod gap location. The CHF mechanism in a tight lattice would be the film dryout occurring by decreasing the liquid film flow rate.


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