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Thermo-Hydraulics and Relaxation of Thermal Non-Equilibrium Two-Phase Flow

Research Project

Project/Area Number 04452325
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field Nuclear engineering
Research InstitutionTOKYO INSTITUTE OF TECHNOLOGY

Principal Investigator

ARITOMI Masanori  Tokyo Institute of Technology, Research Laboratory for Nuclear Reactors Research Associate, 原子炉工学研究所, 助教授 (60101002)

Co-Investigator(Kenkyū-buntansha) TAKAHASHI Minoru  Tokyo Institute of Technology, Research Laboratory for Nuclear Reactors Associat, 原子炉工学研究所, 助手 (90171529)
Project Period (FY) 1992 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥7,100,000 (Direct Cost: ¥7,100,000)
Fiscal Year 1994: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1993: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1992: ¥5,200,000 (Direct Cost: ¥5,200,000)
KeywordsBoiling two-phase flow / Thermo-hydraulics / Relaxation of superheated water / High conversion Light water reactors / Reflooding / Critical flow / Interfacial transport phenomena / Two-fluid model / 高転換軽水炉 / 熱的非平衡 / 自己蒸発 / 緩和現象 / 気液界面熱伝達 / 圧力損失 / ボイド率 / 管内流 / 軽水炉 / 安全性
Research Abstract

The purposes of this work are to offer a fundamental data base for next generation light water reactors and to sophisticate numerical codes for transient two-phase flow. The effect of channel gaps on thermo-hydraulics and the relaxation process of superheated water have been investigated experimentally and analytically. From the results, the following insights are clarified :
(1) For a channel gap narrower than 2mm, thermo-hydraulics of boiling two-phase flow is influenced by channels gaps, and new correlations of boiling heat transfer, two-phase friction multiplier.
(2) The drift flux model is applicable to analyze boiling two-phase flow in channels narrower than 2mm.
(3) During reflooding phase in channels narrower than 2mm, quench velocity becomes much lower than a reflooding rate, and pressure drop becomes so higher than that in channels wider than 2mm.
(4) Underpressure at the relaxation inception point of superheated water and time required for the relaxation inception can be evaluated by modified Jones'model.
(5) Macroscopic relaxation inception is governed by interfacial area density and integration of the superheating by the time passing through the superheated region.
(6) A new correlation of interfacial heat transfer is proposed and the two-fluid model including this correlation explains well the relaxation process and thermo-hydraulics of superheated water.

Report

(4 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • 1992 Annual Research Report
  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] M.Aritomi & A.Inoue: "Thermo-Hyclraulic Behavior of Inverted Annular Flow" Dynamics of Two-Phase Flow,CRC Press Inc.753-772 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] M.Aritomi,et al: "Thermo-Hydraulics of Boiling Tow-Phase Flow on HCLWR" Int.J.Multiphase Flow. 19. 51-63 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] A.Sudi,M.Aritomi,et al: "Relaxation Process of Thermal Non-Equilibreiem in Bciling Two-Phase Flow,(I)Experimental Results" J.Nucl.Sci.Technol. 30. 1171-1183 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] A.Sudi,M.Aritomi,et al: "An Analysis on the Relaxation Rocess of Thermal Non-Equilibreiem State in Bciling Two-Phose Flow" Proc.2nd Int Conf.Multiphose Flow. (発表予定). (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] M.Aritomi and A.Inoue: "Thermo-Hydraulic Behavior of Inverted Annular Flow (Effect of Flow Direction and Channel Diameter)" Dynamics of Two-Phase Flow, CRC Press Inc. 753-772 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] M.Aritomi, et al: "Thermo-Hydraulics of Boiling Two-Phase Flow in High Conversion Light Water Reactor, (Thermo-Hydraulics at Low Velocities)" Int.J.Multiphase Flow. 19. 51-63 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] A.Sudi, M.Aritomi et al: "Relaxation Process of Thermal Non-Equilibrium in Boiling Two-Phase Flow, (I) Experimental Results" J.Nucl.Sci.Technol. 30. 1171-1183 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] A.Sudi and M.Aritomi: "An Analysis on the Relaxation Process of Thermal Non-Equilibrium State in Boiling Two-Phase Flow" Proc.2nd Int., Conf.Multiphase Flow. (to be published). (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] M.Aritomi & A.Inoue: "Thermo-Hydraulic Behavior of Inverted Annular Flow" Dynamics of Two-Phase Flow,CRC Press Inc.753-772 (1992)

    • Related Report
      1994 Annual Research Report
  • [Publications] M.Aritomi,et al.: "Thermo-Hydraulics of Boiling Two-Phase Flow in HCLWR" Int.J.Multiphase Flow. 19. 51-63 (1993)

    • Related Report
      1994 Annual Research Report
  • [Publications] A.Sudi,M.Aritomi,et al.: "Relaxation Process of Thermal Non-Equilibricem in Boiling Two-Phase Flow (I) Experimental Results" J.Nucl.Sci.Technol.30. 1171-1183 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] A.Sudi,M.Aritomi,et al.: "An Analysis on the Relaxation Process of Thermal Non-Equilibrium State in Boiling Two-Phase Flow" Proc.2nd Int.Conf.Multiphase Flow. (発表予定). (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] 有冨正憲他3名: "沸騰二相流の熱的非平衡状態の緩和現象" 第30回日本伝熱シンポジウム講演論文集. Vol.1. 109-111 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] スディアリヤント 有冨 正憲: "熱的非平衡二相流の流動・伝熱特性" 第30回日本伝熱シンポジウム講演論文集. (1993)

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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