The Effect of Surface Coating Layer on Air-Water Mist Cooling of Hot Metals

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This paper deals with transient boiling heat transfer to mist flow of air-water mixture from hot metals coated with a thin layer of low thermal conductivity material. The test specimens used for the present experiment are silver and stainless steel disks whose heat transfer surface is coated with a refractory paint over the thickness range, 3-38μm. The heated disk of 750°C is plunged vertically into the mist flow and is cooled down to the temperature of air-water mixture under atmospheric pressure. The mass velocity of water ranges between 0.04 and 0.78kg/m<SUP>2</SUP>-s. The air velocity is varied from 3 to 7m/s. The coating produces a great enhancement in heat transfer, especially in transition and film boiling regions. This enhancement becomes higher with increasing coating thickness since minimum film boiling temperature becomes higher and an earlier transition from film to transition boiling occurs. Heat transfer is more enhanced as mass velocity of water increases although it has a weak dependence on air velocity.

収録刊行物

  • Journal of nuclear science and technology  

    Journal of nuclear science and technology 35(7), 477-484, 1998-07-25 

    Atomic Energy Society of Japan

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各種コード

  • NII論文ID(NAID)
    10002079689
  • 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
    4525684
  • 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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