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Radiation Induced Surface Activity Phenomenon: 2nd Report — Radiation Induced Boiling Enhancement

[+] Author Affiliations
Tatsuya Koga, Yasuyuki Imai, Tomoji Takamasa

Tokyo University of Mercantile Marine, Tokyo, Japan

Koji Okamoto

University of Tokyo, Tokai, Ibaraki, Japan

Kaichiro Mishima

Kyoto University, Sennan, Osaka, Japan

Paper No. ICONE10-22746, pp. 975-977; 3 pages
doi:10.1115/ICONE10-22746
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

To delineate the effect of Radiation Induced Surface Activity (RISA) on boiling phenomenon, surface wettability in high-temperature environment or Leidenfrost condition and critical heat flux (CHF) of oxide metals irradiated by gamma rays were investigated. When the temperature of the heating surface reaches the wetting limit temperature, water-solid contact vanishes because of a stable vapor film between the droplet and the metal surface, i.e., a Leidenfrost condition. The wetting limit temperature increased with integrated irradiation dose. The CHF of oxidized titanium was improved up to 100% after 800 kGy 60 Co gamma ray irradiated. Radiation Induced Boiling Enhancement (RIBE) phenomenon was firstly confirmed through the experiments.

Copyright © 2002 by ASME

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