Mist Formation in a Water Vapor Cold Trap and Evaluation of Its Removal Rate

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Mist formation conditions in a mixture of non-condensable gas (nitrogen or helium) and water vapor, mass transfer rates onto a cooled wall under the mist formation and choking time are determined in a case of a laminar flow in a vertical round tube cooled from the outside at constant temperatures of 77K to 263K. This is a basic study of a cold trap for a fusion fuel clean-up (fcu) system. If mist is formed in the trap, it makes tritium spikes at the trap outlet, and consequently it causes tritium leakage to the outlet. The limiting condition of mist formation in the present system is quantitatively expressed by the critical supersaturation model (CSM). When the inlet vapor concentration is within the CSM mist formation condition, the outlet concentration is very high immediately after the gas supply and, afterward, it drops very quickly. When within the no-mist formation condition, the outlet concentration is almost constant throughout the frosting time. The trap shows a good removal performance for a long time until choking. This difference in the time variations is successfully explained by the relaxation of the mist formation condition with an increase in the thermal resistance of frost formed on cooled surfaces.

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  • Journal of nuclear science and technology  

    Journal of nuclear science and technology 35(3), 198-204, 1998-03-25 

    Atomic Energy Society of Japan

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各種コード

  • NII論文ID(NAID)
    10002079151
  • NII書誌ID(NCID)
    AA00703720
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00223131
  • NDL 記事登録ID
    4440345
  • NDL 雑誌分類
    ZM35(科学技術--物理学)
  • NDL 請求記号
    Z53-A460
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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