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On the Heat Transfer Mechanism and Stability of High Heat Flux Microbubble Emission Boiling

Research Project

Project/Area Number 05805021
Research Category

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

Allocation TypeSingle-year Grants
Research Field Thermal engineering
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

KUMAGAI Satoshi  Tohoku University, Department of Machine Intelligence and Systems Engineering, Associate Professor, 工学部, 助教授 (30134026)

Project Period (FY) 1993 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1994: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1993: ¥1,700,000 (Direct Cost: ¥1,700,000)
KeywordsBoiling Heat Trnasfer / Microbubble Emission Phenomena / Liquid Subcooling / Bubble Motion / Pressure Fluctuation / Boiling Sound Frequency Characteristics / 気泡挙動 / サブクール / 沸騰音
Research Abstract

Microbubble Emission Boiling (MEB) is the regime that occurs in the transition process from nucleate to film boiling with high liquid subcooling condition, and realizes extremely high heat flux without a marked increase in the amount of wall superheat. MEB has unique aspects different from that of ordinary boiling, such as a profusion of microbubbles emitted from a heat transfer surface. This experimental investigation reveals that this phenomenon includes two regimes, i.e., the stormy and calm microbubble emission boilings. This study also shows temperature fulctuations of a heat transfer surface and pressure fluctuations in the liquid near the surface to classify MEB into the above regimes. The temperature fluctuations in either regime are smaller than those at the critical heat flux. The pressure fluctuations are larger in the stormy MEB,and smaller in the calm MEB as compared with those at the critical heat flux. The liquid subcooling and flow velocity approaching the surface are i … More mportant aspects by which to generate those regimes. A number of experiments lead to the map of MEB regimes that consists of liquid subcooling and flow velocity. An oscillatory character between the two regimes appears under several conditions.
The frequency distribution of sound pressure level when MEB exists, has two peak levels. The first peak that appears from 500 [Hz] has the highest sound pressure level and is difficult to be found out in nucleate boiling region. The second peak appears from 8000 to 16000 [Hz] and this peak is not only in MEB region but also in nucleate boiling region, especially with high liquid subcooling. The intensity of the both peaks is depending on liquid subcooling and heat flux. Bubbles in MEB region collapse toward the heat transfer surface. Bubble collapse frequency and sound pressure level of MEB have similar frequency distributions. Consideration of the above results lease to a hypothesis that collapse of a bubble is an important or controlling factor of the heat transfer mechanism of MEB. Less

Report

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

    (9 results)

All Other

All Publications (9 results)

  • [Publications] 久保 良: "気泡微細化沸騰の発生音と熱伝達の相関性" 日本機械学会論文集 B編. 59. 183-190 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 川崎 正史: "鉛直矩形平面からの気泡微細化沸騰" 第13回日本伝熱シンポジウム講演論文集. 2. 424-426 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Ryo KUBO: "Occurence and Stability of Microbubble Emission Boiling-Stormy and Calm Regimes-" Proceedings of the 10th International Heat Transfer Conference. 5. 99-104 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] R.KUBO,R.SHIMAD and S.KUMAGAI: "Relationship between Sound and Heat Transfer on Microbubble Emission Boiling" Transaction of the Japan Society of Mechanical Engineers. 59-557. 183-190 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] M.KAWASAKI,S.KUMAGAI and R.KUBO: "Microbubble Emission Boiling from a Vertical Surface" Proceedings of the 31st National Heat Transfer Conference. 2. 424-426 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] R.KUBO and S.KUMAGAI: "Occurrence and Stability of Microbubble Emission Boiling -Stormy and Calm Regimes-" Proceedings of the 10th International Heat Conference. 5. 99-104 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 川崎正史: "鉛直矩形平面からの気泡微細化沸騰" 第31回日本伝熱シンポジウム講演論文集. 2. 424-426 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Ryo KUBO: "OCCURENCE AND STABILITY OF MICROBUBBLE EMISSION BOILING-STORMY AND CALM REGIMES-" Proceedings to 10th the International Heat Transfer Conference. 5. 99-104 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 久保良.島田了八.熊谷哲: "気泡微細化沸騰の発生音と熱伝達の相関性" 日本機械学会論文集B編. 59. 183-190 (1993)

    • Related Report
      1993 Annual Research Report

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Published: 1993-04-01   Modified: 2016-04-21  

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