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Study on Instabilities of Cryogenic Two-Phase Flows in a Pipe

Research Project

Project/Area Number 10450070
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Fluid engineering
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

OIKE Mamoru  Institute of Fluid Science, Tohoku University, Associate Professor, 流体科学研究所, 助教授 (70292282)

Co-Investigator(Kenkyū-buntansha) TUJIMOTO Yoshinobu  Faculty of Engineering and Science, Osaka University, Professor, 基礎工学研究科, 教授 (50112024)
MATSUMOTO Yoichiro  Faculty of Engineering, Tokyo University, Professor, 工学系研究科, 教授 (60111473)
KAMIJO Kenjiro  Institute of Fluid Science, Tohoku University, Professor, 流体科学研究所, 教授 (90282003)
TOKUMASU Takashi  Institute of Fluid Science, Tohoku University, Research Associate, 流体科学研究所, 助手 (10312662)
ISHIMOTO Jun  Faculty of Science and Technology, Hirosaki University, Asso. Prof., 理工学部, 助教授 (10282005)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥13,400,000 (Direct Cost: ¥13,400,000)
Fiscal Year 1999: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1998: ¥11,200,000 (Direct Cost: ¥11,200,000)
KeywordsCyrogenic Fluid / Two-Phase Flow / Flow Instability / Molecular Dynamics Method / Direct Numerical Simulation / Unsteady Drift-Flux Model / Liquid Helium / Multi-Bubble / 分散性混相乱流
Research Abstract

Applications using cryogenic fluid generally encounter obstacles or complex pipe shapes such as an orifice or a converging-diverging nozzle. Therefore, a flow visualization study on boiling two-phase flow of liquid helium passing through the convergent-divergent nozzle of a horizontal pipe was carried out. The pipe is filled with pressurized liquid helium and flow immediately occurs by opening the on-off valve installed in the pipe outlet. Liquid helium is continuously supplied form the storage tank, the flow is accelerated at the nozzle throat and the phase change is induced by a pressure decrease. The transient evolution of the multi-bubble dispersion was observed from a high-speed video image. Comparison with results of liquid helium and liquid nitrogen indicated that the two-phase flow state of liquid helium is much more rapidly formed in a more homogeneous bubbly mixture two-phase flow than that of liquid nitrogen.
The fundamental feature of two-phase flows is its multi-scale struc … More ture. Thus, numerical analyses were carried out in the following scales :
The bubble formation in liquid oxygen was simulated by the Molecular Dynamics method. Lennard-Jones potential is used as the intermolecular potential. Simulations were carried out at various number densities in order to determine the number density at the limit of metastability. The results showed that in the liquid of diatomic molecules the bubble is formed at large number density than in the liquid of monatomic molecules against the prediction of the equation of sate of Lennard-Jones fluid.
The direct numerical simulations of rising spherical bubbles in an impure liquid were conducted for various gravities and void fractions. The Navier-Stokes equations were solved by the finite difference method with the rectangular grid system. The mean velocity field induced by rising bubbles was investigated for various void fractions. The results showed that the boundary thickness becomes thinner in the higher void fraction due to the stronger bubble-bubble interaction.
The two-dimensional characteristics of the oiling two-phase flow of liquid helium in a duct were numerically investigated. The governing equations based on the unsteady drift-flux model were conducted and several flow characteristics were numerically calculated, taking into account the effect of superfluidity. The results showed that the vapor gas phase rapidly spreads throughout the inner flow duct because of the change of the pressure gradient due to the effect of superfluidity which appears in momentum equations. Less

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (21 results)

All Other

All Publications (21 results)

  • [Publications] 石本淳他2名: "液体ヘリウムの沸騰気液二相流に関する二次元数値解析"日本機械学会論文集B. 65・630. 482-489 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Ishimoto J.et al.: "Numerical Analysis on Boiling Two-Phase Flow of Liquid Helium"Proc.of HTD99, 33rd National Transfer Conference, Albuquerque. HDT99-50(CD-ROM). (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 杉山和靖他2名: "円柱周りの気泡流の3次元数値解析(第1報:層流剥離領域における数値解析)"日本機械学会論文集B. 65・638. 3260-3267 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 徳増崇他3名: "液体酸素中における気泡生成機構の分子動力学的解析"流体科学シンポジウム講演論文集. SCFS'99. 18-23 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 杉山和靖他2名: "上昇気泡群の多重スケール解析"第13回数値流体力学シンポジウム講演論文集. C03-4(CD-ROM). (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 山森慎也他3名: "液体窒素の管内気液二相流れの研究"日本機械学会東北支部第35期総会・講演会講演論文集. 34-35 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Jun Ishimoto et al.: "Numerical Analysis on Boiling Two-Phase Flow of Liquid Helium"Proceedings of HDT 99, 33rd National Heat Transfer Conference, Albuquerque. (CD-ROM). HDT99-50 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kazuyasu Sugiyama et al.: "Three Dimensional Numerical Analysis for Bubbly Flow around a Circular Cylinder"Transactions of JSME, Series B. Vol. 65, No. 638. 3260-3267 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kazuyasu Sugiyama et al.: "Multi-Scale Analysis for Rising Multi-Bubbles"Proceedings of the 13th Symposium on Computational Fluid Dynamics. (CD-ROM). C03-4 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Jun Ishimoto et al.: "Two-Dimensional Numerical Analysis of Boiling Two-Phase Flow of Liquid Helium"JSME International Journal, Series B. Vol. 43, No. 1. 62-70 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Takashi Tokumasu et al.: "Bubble Nucleation in Liquid Oxygen"Proceedings of ASME FEDSM'00 ASME 2000 Fluids Engineering Division Summer Meeting, Jun, Boston. (CD-ROM). FEDSM2000-11019 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Ishimoto J.et al.: "Numerical Analysis on Boiling two-Phase Flow of Liquid Helium"Proc.of HTD99,33rd National Transfer Conference,Albuquerque. HDT99, HDT99-50(CD-ROM). (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 松本洋一郎他2名: "円柱周りの気泡流の3次元数値解析(第1報:層流剥離領域における数値解析)"目本機械学会論文集B. 65・10. 3260-3267 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 徳増崇他3名: "液体酸素中における気泡生成機構の分子動力学的解析"流体科学シンポジウム講演論文集. SCF'99. 18-23 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 松本洋一郎他2名: "上昇気泡群の多重スケール解析"第13回数値流体力学シンポジウム講演論文集. Co3-4(CD-ROM). (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Ishimoto J.et al.: "two-Dimensional Numerical Analysis of Boiling two-Phase Flow of Liquid Helium"JSME International Journal,Serirs B. 43・1. 62-70 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] 石本淳 他3名: "液体窒素の管内気液二相流れの研究"目本機械学会東北支部第35期総会・講演会講演論文集. 34-35 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Matsumoto,Y.,et al.: "Large Eddy Simulation of Bubbly Turbulent Channel Flow" Proc.of 3rd International Conference on Multiphase Flow. ICMF'98 P280(CD-ROM). (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Matsumoto,Y.,et al.: "Numerical Study of cavitationig flow on a hydrofoil" Proc.of computational technologies for Fluid/Thermal/Chemical system. PVP-377-2. 243-248 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 松本洋一郎、他1名: "気泡流乱流のマルチスケールアナリシス" 第11回計算力学講演会講演論文集. 261-262 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 石本淳、他3名: "液体窒素の管内気液二相流に関する研究" 日本機械学会東北支部第34期講演会講演論文集. (1999)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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