Thermo-fluid Dynamics of Several Film Boiling Modes in He II in the Pressure Range between Atmospheric Pressure and Saturated Vapor Pressure

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  • NOZAWA Masakazu
    Graduate School of Systems and Information Engineering University of Tsukuba Institute of Fluid Science Tohoku University
  • KIMURA Nobuhiro
    High Energy Accelerator Research Organization (KEK)
  • MURAKAMI Masahide
    Graduate School of Systems and Information Engineering University of Tsukuba
  • TAKADA Suguru
    Graduate School of Systems and Information Engineering University of Tsukuba

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  • He II 中の大気圧から飽和圧力の範囲で発生する各膜沸騰モードの熱流動状態
  • He2中の大気圧から飽和圧力の範囲で発生する各膜沸騰モードの熱流動状態
  • He2 チュウ ノ タイキアツ カラ ホウワ アツリョク ノ ハンイ デ ハッセイ スル カク マク フットウ モード ノ ネツ リュウドウ ジョウタイ

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Abstract

Four film boiling modes including the silent film boiling and the noisy film boiling were discriminated experimentally. Each mode was classified through visual observation and transient pressure and temperature measurements near the heater. It was found that in subcooled He II there were two film boiling modes, which are the strongly subcooled and weakly subcooled film boiling modes. The variation of boiling state between these two modes could be visually observed well by use of a transparent heater. All mode of film boiling is clearly mapped in diagrams as a function of pressure, temperature and heat flux. It is elucidated that the existence of He I layer influences the development of the vapor layer. (Translation of the article originally published in Cryogenics 49 (2009) 583–588)

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