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Thermo-Hydraulic Behavior of Inverted Two-Phase Flow

Research Project

Project/Area Number 61580190
Research Category

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

Allocation TypeSingle-year Grants
Research Field Nuclear engineering
Research InstitutionTokyo Institute of Technology

Principal Investigator

ARITOMI Masanori  Tokyo Institute of Technology, 原子炉工学研究所, 助教授 (60101002)

Co-Investigator(Kenkyū-buntansha) TAKAHASHI Minoru  Tokyo Institute of Technology, 原子炉工学研究所, 助手 (90171529)
INOUE Akira  Tokyo Institute of Technology, 原子炉工学研究所, 教授 (20016851)
Project Period (FY) 1986 – 1987
Project Status Completed (Fiscal Year 1987)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1987: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1986: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsInverted Two-phase Flow / Inverted Annular Flow / Boiling Two-Phase Flow / Heat transfer / Pressure drop / Thermally non-equilibrium state / Subcooled liquid / 過熱蒸気 / 二相流 / 熱的非平衡 / 軽水炉の安全性
Research Abstract

Inverted two-phase flow was investigated experimentally in vertical and horizontal flow channels with various diameters using Freon 113 as a test fluid.
The folloving are clarified:
(1) Inverted two-phase flow has three flow regimes, which are inverted annularflow, liquid slug flow and superheated dispersed flow.
(2) Inverted annular flow appears in the region where thermally equilibrium quality is less than zero, liquid slug flow occurs in the region where it is between zero and 0.1, and superheated despersed flow is formed in the region where it is more than 0.1.
(3) Superheated dispersed flow is the same as the one under post-dryout conditions.
(4) Nusselt number of liquid slug flow coincides the one of inverted annular flow at zero quality, increases linearly as increasing the thermally equilibrium quality and is proportion to the square of Reynolds number.
The thermo-hydraulic behavior under thermally non-equilibrium conditions has never been understood in the constitute equations for n … More umerical analysis of transient two-phase flow, which is important for safety analysis of light water reactors. Inverted annular flow has thermally large non-equilibrium state in the same flow cross section where subcooled liquid and superheated vapor exit. Therefore, inverted annular flow was taken up secondly to produce the fundamental data base on the thermo-hydraulic behavior under thermally non-equilibrium conditions and to model it.
From these results, the following are clarified:
(5) Nusselt number of inverted annular flow is proportion to 0.35th of Reynolds number for the horizontal flow but is independent of it for the vertical flow.
(6) Nusselt number of the horizontal flow decreases exponentialy as increasing wall superheating and thermally equilibrium quality. As increasing the flow diameter, the absolute values of the power concerning superheating increases but the one concerning thermally equilibrium quality decreases.
(7) The fundamental data base on vapor film thickness is produced, which is very important for modeling mass, energy and momentum transfer from the interface. The empirical correlation of the thickness is proposed.
(8) The frictional multiplier of inverted annular flow to liquid single phase flow is not correlated by the ratio of the vapor film thickness to the flow diameter but by the thickness. The multiplier is less than 1 lor the thickness less than 0.4mm. Less

Report

(2 results)
  • 1987 Final Research Report Summary
  • 1986 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] 有冨正憲,井上晃,望月謙治: 第24回日本伝熱シンポジウム講演論文集. 449-451 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] M.Aritomi and A.Inoue: Bullitin of the Research Laboratory for Nuclear Reactors,Tokyo Institute of Technology. Vol.13. 79 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 有冨正憲,井上晃,宮田智秀: 第25回日本伝熱インポジウム講演論文集. (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 有冨正憲,望月謙治,宮田智秀: 第7回混相流シンンポジウム. (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] M.Aritomi: Japan-US Seminar on Two-Phase Flow Dynamics. (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Masanori Aritomi, Akira Inoue and Kenji Motizuki: "Basic Study on Inverted Two-Phase Flow (Thermo-Hydraulic Behavior in a Small Tube)" 24th National Heat Transfer Symposium of Japan. 449-451 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Masanori Aritomi and Akira Inoue: "Thermo-Hydraulic Behavior of Inverted Annular Flow" Bullitin of the Research laboratory for Nuclear Reactors, Tokyo Institute of Technology. 13. 79 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Masanori Aritomi, Akira Inoue and Tomohide Miyata: "Basic Study on Inverted Two-Phase Flow (3rd. Effect of channel diameter on thermo-hydraulics)" 25th National Heat Transfer Symposium of Japan. (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Masanari Aritomi, Kenji Motizuki and Tomohide Miyata: "Basic Study on Inverted Two-Phase Flow (4th. Mass, Energy and Momentum Transfer from Interface)" 7th Symposium of Multi-Phase Flow. (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Masanori Aritomi: "Thermal and Hydraulic Behavior of Inverted Annular Flow. Effects of Different Flow Area and Flow Direction" Japan-US Seminar on Two-Phase Flow Dynamics. (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 有冨正憲: 第24回日本伝熱シンポジウム講演論文集. (1987)

    • Related Report
      1986 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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