2019 Fall Meeting

Presentation information

Oral presentation

III. Fission Energy Engineering » 304-1 Thermal Hydraulics, Energy Conversion, Energy Transfer, Energy Storage

[1F10-14] Molten Debris Behavior 1

Wed. Sep 11, 2019 3:35 PM - 4:55 PM Room F (Common Education Bildg. 2F C21)

Chair:Kei Ito(Kyoto Univ.)

4:35 PM - 4:50 PM

[1F14] Study on Boiling Heat Transfer Characteristics in Debris Beds

4th:Visualization of boiling behaviors on a heating surface

*Taira Kawakami1, Hiroto Sakashita1, Ayako Ono2, Hiroyuki Yoshida2 (1. Hokkaido Univ., 2. JAEA)

Keywords:Severe accident, Debris beds, Boiling heat transfer, Critical heat flux, Visualization

Understanding the boiling heat transfer characteristics in debris beds is indispensable to assess the coolability of molten debris at severe accident. However, the trigger mechanism of the critical heat flux on the bottom heated debris beds has not been fully elucidated. This study performed the visualization measurements using a transparent heating surface on which small particles are accumulated. The boiling behaviors were observed via a total reflection technique, and effects of particle size on dryout and rewetting process of the heating surface were examined.