A Modeling of the Liquid-Vapor Flow in a Self-Heated Porous Medium : With Application to the Dryout Limits

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Time dependent flow and heat removal behavior up to incipient dryout in a porous medium are investi-gated numerically. The porous medium composed of coarse particles with volumetric heating is cooled by a countercurrent flow in a two-phase region with evaporation. A separated flow model, based on the two-phase extended Ergun equations with Ergun constants depending on Reynolds number and on the mass conserva-tion, is developed for a local thermodynamic equilibrium between each phase. Owing to the nonlinearity of the coefficients appearing in the governing equations, numerical computations are iteratively made. Numerical predictions are also compared with available data of dryout heat flux in the literature. For the cases of shallow porous media the predicted dryout heat generation rates lie in the experimental ranges. However, the cases of deeper porous media were overpredicted by this calculation. In addition, the transient heat removal process up to dryout is discussed qualitatively by means of the axial liquid volumetric fraction, phase pressure, liquid velocity and vapor velocity distributions.

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  • Journal of nuclear science and technology  

    Journal of nuclear science and technology 33(9), p.686-695, 1996-09-25 

    Atomic Energy Society of Japan

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各種コード

  • NII論文ID(NAID)
    10002075408
  • 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
    4060425
  • 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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