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Enhancement of heat transfer due to bubbles passing through a narrow vertical rectangular channel and its upper limit

Research Project

Project/Area Number 62550160
Research Category

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

Allocation TypeSingle-year Grants
Research Field Thermal engineering
Research InstitutionSaga University

Principal Investigator

MONDE Masanori  Saga Univ., Faculty of Sci. and Eng., Associate Professor, 理工学部, 助教授 (80109222)

Project Period (FY) 1987 – 1988
Project Status Completed (Fiscal Year 1988)
Budget Amount *help
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1988: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1987: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsPhase Change / Boiling / Enhancement of Heat Transfer / Natural Conyection / 自然対流 / 垂直流路 / 自然流動
Research Abstract

In order to elucidate the mechanism of enhancement of heat transfer due to bubbles passing through a narrow vertical channel, an experiment has been carried out by two different procedures: one is that an artificial bubble is employed to control the period and the length of the bubble and the other is that bubbles naturally generated on the several heated surface mounted in the narrow vertical channel are used. The experimental range is as follows: for the artificial bubble, the bubble length is l = 10, 20, and 30 mm, the period is from T_o = 0.033 to 1.0 sec, the clearance of the channel is from S = 2 to 7 mm, water, R113, and ethanol is used as working fluid, and the system pressure is atmospheric pressure and for the natural bubble, the number of the heated surface are 3 or 5, the heat flux is from q_w = 10^3 to 7 x 10^4 w/m^2, the clearance is S = 1, 2, and 4 mm, and water, R113, and R12 are employed as working fluid, and the pressure is form p = 1 to 20 bar.
The following experimental results are obtained:
1. The enhancement of the heat transfer strongly depends on the bubble length and the effectiveness of the enhancement is increased as its length becomes large.
2. The upper limit of the enhancement would be determined as a function of ROO<aT>_o/ and , where a is thermal diffusivity, is the thickness of the liquid film created by the bubble when it passes over the heated surface and is the time during which the heated surface is covered with the bubble.
3. On the basis of the experimental result, an theoretical analysis is made to predict the characteristic of the enhancement and it can predict the experimental result fairly well.

Report

(3 results)
  • 1988 Annual Research Report   Final Research Report Summary
  • 1987 Annual Research Report
  • Research Products

    (22 results)

All Other

All Publications (22 results)

  • [Publications] Monde,Masanori: Waerme und Stoffuebertragung. 22. 91-95 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Monde,Masanori: Int.1st World Conf.on Experimental Heat Transfer,Fluid Mechanics,and Thermodynamics. 1. 1459-1465 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Monde,Masanori: Trans.of ASME,Journal of Heat Transfer. 110. 1016-1019 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 門出政則: 日本機械学会論文集(B編). 54. 3214-3218 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 門出政則: 日本機械学会論文集(B編). 55. (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Monde,Masanori: International Journal of Multiphase Flow.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Monde Masanori: "Upper limit of enahncement of boiling heat transfer in a narrow vertical rectangular channel due to passing bubbles" Waerme und Stoffuebertragung. 22. 91-95 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Monde Masanori: "Characteristic of heat transfer enahncement due to bubbles passing through a narrow vertical channel" Trans. of ASME, Journal of Heat Transfer. 110. 1016-1019 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Monde Masanori: "Enhancement of heat transfer due to bubbles passing through a narrow vertical rectangular channel" Inter. 1st World Conf. on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics. 1. 1459-1465 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Monde Masanori: "Enhancement of heat transfer due to bubble passing through a narrow vertical rectangular channel ( Theoretical analysis with evaporation on an interface )" International Journal of Multiphase Flow.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Monde Masanori.: Int.1st World Conf.on Experimental Heat Transfer,Fluid Mechanics,and Thermodynamics. 1. 1459-1465 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] Monde Masanori.: Trans.of ASME,Journal of Heat Transfer. 110. 1016-1019 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 門出政則: 日本機械学会論文集(B編). 54. 3214-3218 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 門出政則: 日本機械学会論文集(B編). 55. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] 門出政則: 日本機械学会論文集(B編).

    • Related Report
      1988 Annual Research Report
  • [Publications] Monde Masanori.: International Journal of Multiphase Flow.

    • Related Report
      1988 Annual Research Report
  • [Publications] Monde M.;Mihara S., and Ono Y.: Warme und Stoffuebertragung. 22. 91-95 (1988)

    • Related Report
      1987 Annual Research Report
  • [Publications] Monde M.: Trans. ASME, Journal of Heart Transfer.

    • Related Report
      1987 Annual Research Report
  • [Publications] Monde M. and Kusuda H.: Inc. lst World Conf. on Experimental Heart Transfer Fluid Mechanics and Thermodynamics.

    • Related Report
      1987 Annual Research Report
  • [Publications] 門出政則, 三原信一, 野間格: 日本機械学会論文集.

    • Related Report
      1987 Annual Research Report
  • [Publications] 門出政則, 光武雄一: 第25回日本伝熱シンポジウム講演論文集.

    • Related Report
      1987 Annual Research Report
  • [Publications] 門出政則, 三原信一, 野間格: 第25回日本伝熱シンポジウム講演論文集.

    • Related Report
      1987 Annual Research Report

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Published: 1987-04-01   Modified: 2016-04-21  

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