Experimental Study on Flow Boiling of Carbon Dioxide in a Horizontal Microfin Tube

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  • KUWAHARA Ken
    Faculty of Interdisciplinary Graduate School of Engineering Sciences, Kyushu University
  • IKEDA Soshi
    Department of Energy and Environmental Engineering,Interdisciplinary Graduate School of Engineering Sciences, Kyushu University
  • KOYAMA Shigeru
    Faculty of Interdisciplinary Graduate School of Engineering Sciences, Kyushu University

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Other Title
  • 水平内面ら旋溝付管内におけるCO<Sub>2</Sub>冷媒の沸騰蒸発流に関する実験的研究
  • 水平内面ら旋溝付管内におけるCO2冷媒の沸騰蒸発流に関する実験的研究
  • スイヘイ ナイメン ラ センコウツキ カンナイ ニ オケル CO2 レイバイ ノ フットウ ジョウハツリュウ ニ カンスル ジッケンテキ ケンキュウ

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Abstract

This paper deals with the experimental study on flow boiling heat transfer of carbon dioxide in a micro-fin tube. The geometrical parameters of micro-fin tube used in this study are 6.07 mm in outer diameter, 5.24 mm in average inner diameter, 0.256 mm in fin height, 20.4 in helix angle, 52 in number of grooves and 2.35 in area expansion ratio. Flow patterns and heat transfer coefficients were measured at 3-5 MPa in pressure, 300-540 kg/(m2s) in mass velocity and -5 to 15 °C in CO2 temperature. Flow patterns of wavy flow, slug flow and annular flow were observed. The measured heat transfer coefficients of micro-fin tube were 10-40 kW/(m2K). Heat transfer coefficients were strongly influenced by pressure.

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