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Study on Counter-Current Flow Rewetting in Narrow-Annular Flow Passages

[+] Author Affiliations
Naoki Sakamoto, Asanuma Hironobu, Shimamura Yosihiro, Tukudo Masanori, Yasuo Koizumi, Hiroyasu Ohtake

Kogakuin University, Hachioji, Tokyo, Japan

Paper No. ICONE10-22748, pp. 983-988; 6 pages
doi:10.1115/ICONE10-22748
From:
  • 10th International Conference on Nuclear Engineering
  • 10th International Conference on Nuclear Engineering, Volume 4
  • Arlington, Virginia, USA, April 14–18, 2002
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 0-7918-3598-7 | eISBN: 0-7918-3589-8
  • Copyright © 2002 by ASME

abstract

Rewetting of a hot wall by gravitational liquid penetration into a narrow-annular space was experimentally examined. Experiments were conducted by using R-113 liquid to simulate high-pressure and high-temperature water. When the gap clearance was 5 mm, liquid fell down into the annular space and accumulated in the lower portion of the flow channel. Then, the hot wall was quenched from the bottom by the accumulated liquid. When the gap clearance was less than 1mm, liquid did not penetrate into the space substantially because of the counter-current flow limiting at the top entrance. Therefore, the hot wall was cooled down very slowly and quenching was not perceived distinctly. When the gap clearance was 2 mm, mixed phenomena of the gap clearance 5 mm and 1 mm were observed. The heat transfer characteristics during quenching were quite similar to those in pool boiling. However, the film boiling heat flux and the peak (critical) heat flux tended to decrease with the gap spacing. The rewetting velocity became slow as the gap spacing became narrow. The liquid penetration limiting with the gap spacing might be reflected on this trend.

Copyright © 2002 by ASME
Topics: Flow (Dynamics)

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