Two-Phase Pressure Drop of a Refrigerant Flowing Vertically Downward in a Mini-channel

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  • MIYATA Kazushi
    Department of Mechanical Engineering Science, Graduate School, Kyushu University Research Fellow of the Japan Society for the Promotion Science
  • ENOKI Koji
    Department of Mechanical Engineering Science, Graduate School, Kyushu University
  • MORI Hideo
    Department of Mechanical Engineering, Kyushu University
  • HAMAMOTO Yoshinori
    Department of Mechanical Engineering, Kyushu University

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Other Title
  • 冷媒の微細流路内垂直下降気液二相流の圧力損失
  • レイバイ ノ ビサイ リュウロ ナイ スイチョク カコウキエキ ニソウリュウ ノ アツリョク ソンシツ

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Abstract

Experiments were performed on two-phase pressure drop of a refrigerant R-410A flowing vertically downward in small copper circular tubes with 0.5-2.0 mm I.D., and small copper rectangular and triangular tubes with 1.04 and 0.88 mm inner hydraulic equivalent diameter, respectively, for the development of a high-performance heat exchanger using small tubes or multi-port extruded tubes for air conditioning systems.Pressure drops were measured and flow patterns were observed in the range of mass flux from 30 to 400 kg/(m2s)and quality from 0.1 to 0.9 at the saturation temperature of 10 °C. Characteristics of measured pressure drops were examined for different flow channel geometries. In high quality region or relatively high mass flux condition, the frictional pressure drop was reproduced well by the Lockhart-Martinelli correlation used together with a new correlation for Chisholm's parameter C as a function of hydraulic equivalent diameter. In low mass flux and low quality region, the frictional pressure drop was also reproduced well by multiplying the Chisholm two-phase multiplier factor by modified coefficient. In addition, flow pattern was observed with 0.5 and 2.0 mm I.D circular glass tubes. Slug flow and annular flow patterns were observed at lower and higher quality, respectively.

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