Visualization of dryout phenomenon and liquid film behavior using a single subchannel of a tight lattice bundle

Miyuki Akiba, Shinichi Morooka, Junji Mimatsu, Sinji Sakai, Akira Inoue

Research output: Contribution to journalArticle


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.

Original languageEnglish
Pages (from-to)363-372
Number of pages10
JournalMultiphase Science and Technology
Issue number4
Publication statusPublished - 2007
Externally publishedYes


ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

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