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On the Occurrence, Stability and Heat Transfer Enhancement of Microbubble Emission Boiling

Research Project

Project/Area Number 13650206
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Thermal engineering
Research InstitutionSHINSHU UNIVERSITY (2003)
Tohoku University (2001-2002)

Principal Investigator

KUMAGAI Satoshi  Shinshu University, Faculty of Education, Professor, 教育学部, 教授 (30134026)

Project Period (FY) 2001 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2003: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2002: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2001: ¥2,300,000 (Direct Cost: ¥2,300,000)
KeywordsBoiling Heat Transfer / Microbubble Emission Phenomena / Liquid Subcooling / Bubble Motion / Conditional Sampling / Bubble Collapsing Velocity / Power Spectrum / Surface Erosion / 伝熱 / 沸騰 / 気泡微細化 / 気泡崩壊周期 / 固液接触 / ボイド信号 / 局所温度分布 / 気泡崩壊
Research Abstract

In subcooled boiling under certain conditions of subcooling and velocity of the liquid, the heat flux does not decrease with increasing of the surface temperature in transition boiling regime, but increases steeply. In this phenomenon a lot of minute bubbles are emitted from the surface accompanied by extraordinary loud sound. Therefore, we call this phenomenon microbubble emission boiling, abbreviated as MEB. The high heat flux in MEB far exceeding CHF should be considered a result of violent growing and collapsing behavior of coalescent bubbles in that region, which strongly introduces subcooled liquid to the heated surface.
In this study, the liquid temperature profiles were measured at the process of growing and collapsing of bubbles separately with conditional sampling method, by using a thermocouple set at a suitable position above the center of the surface as a detecting prove of bubble motion. In the period of bubble collapse, the high temperature appeared only on the central pa … More rt of the surface. This high temperature region indicates the position of high provability for vapor phase to have existed, suggesting that the bubbles shrink and collapse toward the center on the surface. Here, we tried to get an information about the moving velocity of liquid-vapor interface in the bubble shrinking stage near the moment of collapse, which was named as the collapsing velocity, here, with a twin electrode void probe. The velocity was very high in MEB comparing with that of nucleate boiling. In MEB, the collapsing velocity increased with increasing of the heat flux, to be as much as 20 m/s at 20 MW/sq.m in the heat flux.
The bubble motion can be monitored directly by an electrode void probe. The frequency of the fluctuation of the void signal indicates the frequency of the chance of liquid supply onto the surface. Therefore, the peak frequency of the power spectrum of the void signal fluctuation should be an index of heat transfer, and heat flux must be a function of the frequency. The relation between the peak frequency and heat flux was obtained for various condition of liquid subcooling and velocity. Though the data showed a wide scattering, a trend of higher peak frequency is distinguished in lower liquid subcooling. It was rearranged for excess heat flux from CHF, to get a correlation function. Less

Report

(4 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] 熊谷 哲: "気泡微細化沸騰におけるボイド信号に基づく固液接触の考察"日本機械学会論文集 B編. 67. 2304-2310 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 臼田 嘉剛: "気泡微細化沸騰の発生と安定化過程"第39回日本伝熱シンポジウム講演論文集. 1. 173-174 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 小林 武: "気泡微細化沸騰の不安定領域における気泡挙動"日本機械学会東北支部第39期秋期講演会講演論文集. No.031-2. 101-102 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Satoshi KUMAGAI: "Micro-Bubble Emission Boiling from Horizontal and Vertical Surface to Subcooled Parallel Flow Water"Heat Transfer - Asian Research. 32. 130-140 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Satoshi KUMAGAI: "Heat Transfer Mechanism Based on Temperature Profiles and Bubble Motion in Microbubble Emission Boiling"Proc.6th ASME-JSME Thermal Engineering Joint Conference. TED-AJ03-219. 1-8 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.KUMAGAI, T.Uhara, T.Nakata, M.Izumi: "Liquid-Solid Contact in Microbubble Emission Boiling through Void Signals"Transaction of the Japan Society of mechanical Engineers. 67-661. 154-160 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.KUMAGAI, T.Uhara, T.Nakata, M.Izumi: "Liquid-Solid Contact in Microbubble Emission Boiling through Void Signals"Transaction of the Japan Society of Mechanical Engineers. 67-661. 154-160 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Y.Usuda, S.Kumagai, T.Kobayashi: "Stability of Microbubble Emission Boiling"Proc. 39th National Heat Transfer Conference of Japan. Vol.1. 173-174 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Y.Usuda, S.Kumagai, T.Kobayashi: "Stability of Microbubble Emission Boiling"Proc. 39th National Heat Transfer Conference of Japan. Vol.1. 173-174 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Kobayashi, S.Kumagai, R.Shimada: "Bubble Motion in Unstable Region of Microbubble Emission Boiling"Proc. 39th Term Conference of the Japan Society of Mechanical Engineers, Tohoku Area. No.031-2. 101-102 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.Kumagai, R.Kubo, T.Kawasaki: "Microbubble-Emission Boiling from Horizontal and Vertical Surfaces to Subcooled Parallel Flow Water"Heat Transfer -Asian Research. 32-2. 130-140 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.Kumagai, S.Murata, M.Izumi, R.Shimada: "Heat Transfer Mechanism Based on Temperature Profiles and Bubble Motion in Microbubble Emission Boiling"Proc. 6th ASME-JSME Thermal Engineering Joint Conference. TED-AJ03-219. (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.Kumagai, S.Murata, M.Izumi, R.Shimada: "Heat Transfer Mechanism Based on Temperature Profiles and Bubble Motion in Microbubble Emissiom Bioling"Proceeding of the 6th ASME-JSME Thermal Engineering Joint Conference. Ted-AJ03-219. 1-8 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 小林, 熊谷, 島田: "気泡微細化沸騰の不安定領域における気泡挙動"日本機械学会東北支部第39期秋期講演会講演論文集. No.031-2. 101-102 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 臼田, 熊谷, 小林: "気泡微細化沸騰の発生と安定化過程"第39回日本伝熱シンポジウム講演論文集. 1巻. 173-174 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 熊谷・兎原・中田・泉: "気泡微細化沸騰におけるボイド信号に基づく固液接触の考察"日本機械学論文集B編. 67巻661号. 2304-2310 (2001)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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