Droplet Behavior Analyses in the BWR Dryer and Separator

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Droplet behavior in the BWR dryer and separator was analyzed. The computer program HIJET-AFIMA was used to simulate the liquid droplet behavior in a dryer with four stage wave-type vanes. This program can describe movement of liquid droplets, as influenced by gas flow, and their deposition on the vane surface, considering drag force which is exerted on droplets. Close agreement between calculations and air-water tests was obtained for the wetness fraction at the exit of each vane stage. The calculated results under reactor conditions showed that larger droplets (30-600μm in diameter) were concentrated in the first and second stages due to their larger inertia force. Smaller droplets (less than 30μm in diameter) were able to pass through the flow channel without deposition on the vane surface. This was because the effect of the drag force was exerted more strongly on smaller droplets. As a result, wetness fraction at the exit was small and less than 0.1% when inlet wetness was 10%.<BR>The droplet behavior analyses in a separator showed that the deposition coefficient with swirl was much higher than that without swirl. Since the ratio of inertia force to drag one was almost the same everywhere in the separator, the difference in inlet quality had only a small effect on droplet deposition.

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  • Journal of nuclear science and technology  

    Journal of nuclear science and technology 35(4), 286-293, 1998-04-25 

    Atomic Energy Society of Japan

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各種コード

  • NII論文ID(NAID)
    10002079268
  • 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
    4462476
  • 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  CJP引用  NDL  J-STAGE 
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