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Studies of mechanism of noisy film boiling in He II and its control

Research Project

Project/Area Number 07455388
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Aerospace engineering
Research InstitutionUniversity of Tsukuba

Principal Investigator

MURAKAMI Masahide  Institute of Engineering Mechanics, University of Tsukuba, Professor, 構造工学系, 教授 (40111588)

Co-Investigator(Kenkyū-buntansha) IIDA Teruhito  Faculty of Aerospace Engineering Nagoya University, Research Associate, 工学部・航空宇宙工学科, 助手 (60273273)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥6,400,000 (Direct Cost: ¥6,400,000)
Fiscal Year 1996: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1995: ¥4,300,000 (Direct Cost: ¥4,300,000)
KeywordsSuperfluid helium / Noisy film boiling / Silent film boiling / Loud acoustic noise / Noise induced instability / Subcooled superfluid helium
Research Abstract

The objectives of this research are the investigations of the mechanism of loud audible noise generation during noisy film boiling in He II and of the control method of it. Visualization of thermo-fluid dynamic field resulted from boiling and the measurements of the temperature by a superconductive temperature sensor and of the pressure by a pressure sensor are conducted comprehensively for the purpose. The following conclusions are drawn from the present study.
(1) There are three modes of film boiling in He II appearing in the order of the hydrostatic pressure level, silent film boiling, noisy film boiling and subcool film boiling. The dependence of the onset condition of noisy film boiling on such parameters as the temperature, the static pressure and the heater size are made clear. The cause of the loud audible noise generation is found to be the explosive evaporation of He II on overheated heater immediately after the crush of a large vapor bubble on a heater surface.
(2) It is foun … More d that sinusoidally oscillating thermal disturbance superposed on steady constant heat flux forces to induce the transition from silent to noisy film boiling. This indicates that the transition to noisy boiling is a kind of noise induced instability.
(3) The FFT analysis result of the pressure oscillation measurement data is examined to consider the detail of the pressure oscillation caused in three film boiling modes. The high frequency (the order of kHz) components of pressure oscillation in subcool boiling are found to be resulted from the liquid column oscillation of He II in the cryostat.
(4) The general feature of the transition from noisy to silent film boillings in weakly subcooled He II is made clear. At the temperatures very close to the lambda-temperature subcool boiling directly turns to silent boiling without passing through noisy boiling mode as the static pressure decreases.
(5) The construction of the physico-mathematical model to describe the mechanism of noisy boiling in He II has not been completed, but sufficient amount data are accumulated for this. The control of noisy boiling is reedy to be investigated from the present experimental data. Less

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] M.Yamaguchi: "The investigation vapor bubble vibration during noisy film boiling in superfluid helium" Proc.of 16th Internaional Cryogenic Engineering Conference (ICEC16). (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Murakami: "Thermo-fiuid dynamic aspect of noisy film boiling phenomena" Adv.Cryo.Engineering. 41A. 257-264 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Murakami: "The initial thermo-fluiddynamic process of boiling phenomena in He II" Cryogenics. 36-3. 175-181 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Y.Katsuki: "Visualization study on the onset of film boiling and the transition to a noisy film boiling in He II" Cryogenics. 35-10. 631-635 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Murakami: "Study of the onset condition of noisy film boiling in superfluid helium" Proc.30th Intersociety Energy Conversion Engineering Conf.3. 301-306 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Yamaguchi and M.Murakami: "The investigation of vapor bubble vibration during noisy film boiling in superfluid helium." Proc.of 16th International Cryogenic Engineering Conference (ICEC16). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Murakami, Y.Katsuki, and M.Yamaguchi: "Thermo-fluid dynamic aspect of noisy film boiling phenomena." Adv.Cryo.Engineering. 41A. 257-264 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Murakami, T.Iida, T.Shimazaki, Y.Katsuki and T.Sato: "The initial thermo-fluid dynamic process of boiling phenomena in He II." Cryogenics. 36-3. 175-181 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Y.Katsuki, M.Murakami, T.Iida and T.Shimazaki: "Visualization study on the onset of film boiling and the transition to a noisy film boiling in He II." Cryogenics. 35-10. 631-635 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Murakami and Y.Katsuki: "Study of the onset condition of noisy film boiling in superfluid helium." Proc.30th Intersociety Energy Conversion Engineerig Conf.Vol.3. 301-306 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Yamaguchi: "The investigation of vapor bubble vibration during noisy film boilimg in superfluid helium" Proc.of 16th International Cryogenic Engineering Conference (ICEC16). (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] M.Murakami: "Thermo-fluid dynamic aspect of noisy film boiling phenomena" Ady.Cryo.Engineering. 41A. 257-264 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] M.Murakami: "The initial thermo-fluiddynamic process of boiling phenomena in He II" Cryogenics. 36-3. 631-635 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Yasuo Katsuki: "Visualization study on the ons-et of film boiling and the transition to a noisy film boiling in He II" Cryogenics. 35-10. 631-635 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Masahide Murakami: "Study of the onset condition ofnoisy film boiling in superfluid helium" IECEC Proceedings(30th Intersociety Energy Conversion Engineering Conference). 3. 301-306 (1995)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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