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STUDY ON THE CONDENSATION HEAT TRANSFER AND FLOW MECHANISM OF ALTERNATIVE REFRIGERANTS IN MICRO CHANNELS

Research Project

Project/Area Number 11650226
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Thermal engineering
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

KOYAMA Shigeu  Institute of Advanced Material Study, KYUSHU UNIVERSITY, Prof., 機能物質科学研究所, 教授 (00153693)

Co-Investigator(Kenkyū-buntansha) KUWAHARA Ken  Institute of Advanced Material Study, KYUSHU UNIVERSITY, Ast.Prof.Research Ass., 機能物質科学研究所, 助手 (90243964)
YU Jian  Institute of Advanced Material Study, KYUSHU UNIVERSITY, Ass.Prof., 機能物質科学研究所, 助教授 (30274533)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2000: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1999: ¥2,400,000 (Direct Cost: ¥2,400,000)
KeywordsMicro Channel / Condensation Heat Transfer / Pressure Drop / Alternative Refrigerant / Experiment / 凝縮 / 熱伝達 / 流動様式
Research Abstract

In this study, it is aim to contribute to develop the very small and high performance condensers by clarifying the characteristics of local heat transfer and pressure drop in parallel channels with small diameter experimentally. The results are summarized as follows.
(1) The Chischolm-Laird type correlation is proposed. In this correlation, the coefficient of second term changed from 21 to 4.81 and using X_<11> instead of X from the experimental results of total pressure drop with changing the outlet quality and mass velocity as a parameter. As a result, by using the correlation, predicted values are within ±30% error for most of all data of total pressure drop.
(2) It is confirmed that the predicted values of the present correlation agree with the data of pressure distribution along the flow direction within ±30% error.
(3) Compared the pressure drop data with the correlation of Mishima-Hibiki, the data agree with the correlation within ±30% by using X_<11>. The data also compared with t … More he correlation of Haraguchi et al. The data, however, don't agree with the correlation. In this study, hydraulic diameters of the tubes are 0.7 to 0.9, Mishima and Hibiki proposed the correlation based on the data of the tube with 1 to 4mm in diameter, but Haraguchi et al. proposed the correlation based on the tube with 8.5mm in diameter, therefore, the data agree with the correlation of Mishima-Hibiki, however, the data don't agree with the correlation of Haraguchi et al.
(4) Compared the heat transfer data with the correlation of Moser et al., the data agree with the correlation within ±30% error in the case of the mass velocity above 300kg/m^2s, but disagree with the correlation in the case of the mass velocity below 200kg/m^2s. This reason is that Moser et al. didn't take account of the influence of the natural convective condensation heat transfer, and so, in the case of low mass velocity, when the influence of natural convection isn't small, it is hard to present the phenomena by using this correlation.
(5) The data also disagree with the correlation of Haraguchi et al., which is based on the data of the tube of 8.5mm in diameter. However, using the correlation of Mishima-Hibiki for the pressure drop multiplier factor instead of the correlation of Haraguchi et al. for the pressure drop in their heat transfer correlation, most of all the data agree with this modified heat transfer correlation within ±50%. This reason is that Haraguchi et al. take account of both of the forced convective and natural convective condensation heat transfer, and so predicting accuracy becomes higher when the influence of tube diameter is took account of.
(6) From the results (4) and (5), there is the influence of gravity even in the case of small diameter tubes when the mass velocity is low. Less

Report

(3 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] 小山繁,中下功一,桑原憲,伊東大輔,山本憲,下谷昌宏: "扁平多孔管内における純冷媒HFC134aの凝縮に関する実験"第37回日本伝熱シンポジウム講演論文集. Vol.3. 679-680 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 小山繁,桑原憲,中下功一,山本憲: "微細管内における気液二相流の流動,伝熱過程"日本機会学会2000年度年次大会資料集. 545-547 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] S.Koyama,K.Nakashita,K.Kuwahara,D.Itoh,K.Yamamoto and M.Shimoya: "Heat Transfer Characteristics of Pure Refrigerant HFC134a Condensing in a Multi-Port Extruded Tube"Proceedings of the 4^<th> JSME-KSME Thermal Engineering Conference. Vol.3. 763-768 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] S.Koyama,K.Kuwahara,K.Nakashita: "Condensation of Pure Refrigerant HFC134a in a Multi-Port Extruded Tube"Proceedings of the 2^<nd> Cross Straits Symposium on Materials, Energy and Environmental Sciences. 35-36 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 小山繁,中下功一,桑原憲,工藤章一: "純冷媒HFC134aの扁平微細多孔管内凝縮過程における局所熱伝達・圧力損失特性"第38回日本伝熱シンポジウム講演論文集. (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] S.Koyama, K.Nakashita, K.Kuwahara, D.Itoh, K.Yamamoto and M.Shimoya: "An Experiment on Condensation of Pure Refrigerant HFC134a in a Multi-Port Extruded Tube"Proc. of 37^<th> National Heat Transfer Symposium of Japan. Vol.3. 679-680 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] S.Koyama, K.Kuwahara, K.Nakashita and K.Yamamoto: "Flow and Heat Transfer Characteristics of Two Phase Flow in Small Diameter Tubes"Proc. of JSME annual meeting 2000. 545-547 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] S.Koyama, K.Nakashita, K.Kuwahara, D.Itoh, K.Yamamoto and M.Shimoya: "Heat Transfer Characteristics of Pure Refrigerant HFC134a Condensing in a Multi-Port Extruded Tube"Proc. of the 4^<th> JSME-KSME Thermal Engineering Conference. Vol.3. 763-768 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] S.Koyama, K.Kuwahara and K.Nakashita: "Condensation of Pure Refrigerant HFC134a in a Multi-Port Extruded Tube"Proc. of the 2^<nd> Cross Straits Symposium on Materials, Energy and Environmental Sciences. 35-36 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] S.Koyama, K.Nakashita, K.Kuwahara and S.Kudoh: "Pressure Drop and Local Heat Transfer Characteristics of Pure Refrigerant HFC134a Condensing in a Multi-Port Extruded Tube"Proc. of 38^<th> National Heat Transfer Symposium of Japan. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 小山繁,中下功一,桑原憲,伊東大輔,山本憲,下谷昌宏: "扁平多孔管内における純冷媒HFC134aの凝縮に関する実験"第37回日本伝熱シンポジウム. Vol.3. 679-680 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] S.Koyama,K.Nakashita,K.Kuwahara,D.Itoh,K.Yamamoto and M.Shimoya: "Heat Transfer Characteristics of Pure Refrigerant HFC134a Condensing in a Multi-Port Extruded Tube"Proceedings of the 4^<th> JSME-KSME Thermal Engineering Conference. Vol.3. 763-768 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 小山繁,桑原憲,中下功一,山本憲,下谷昌宏: "扁平微細多孔管における純冷媒HFC134aの凝縮熱伝達"平成11年度日本冷凍空調学会学術講演会講演論文集. 73-76 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 小山繁,桑原憲,中下功一,伊藤大輔,山本憲,下谷昌宏: "扁平多孔管における純冷媒HFC134aの凝縮に関する実験"第37回日本伝熱シンポジウム講演論文集. (発表予定). (2000)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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