Experiment on Flow Boiling of HFC134a in a Multi-port Extruded Tube

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  • KUWAHARA Ken
    Institute for Materials Chemistry and Engineering, Kyushu University
  • KOYAMA Shigeru
    Institute for Materials Chemistry and Engineering, Kyushu University
  • KAZARI Kengo
    Int. Graduate School of Engineering Sciences, Kyushu University
  • NAKAHITA Kouichi
    Int. Graduate School of Engineering Sciences, Kyushu University

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Other Title
  • 扁平微細多孔管内におけるHFC134aの沸騰・蒸発に関する実験
  • ヘンペイ ビサイ タコウカン ナイ ニ オケル HFC134a ノ フットウ ジョウハツ ニ カンスル ジッケン

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Abstract

In the present study, the local heat transfer and pressure drop characteristics are investigated experimentally for the flow boiling of refrigerant HFC134a in a multi-port extruded tube of 1.06mm in hydraulic diameter. The test tube is 865mm in total length made of aluminum. The pressure drop was measured at an interval of 191mm, the local heat transfer coefficient was measured in every subsection of 75mm in effective heating length. The measured pressure drop was compared with a few correlations. Those data agree with the correlation of Koyama et al., proposed for condensation process, and of Friedel. The local heat transfer coefficients were also compared with correlation of Yu et al. It is pointed out that multiplier of the convection term in a rectangular channel is different from that of circular tube.

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