水平矩形ダクト内波状流における気液界面せん断応力に関する実験的研究

  • 伊藤 和宏
    名古屋大学大学院工学研究科エネルギー理工学専攻 日本原子力研究所
  • 辻 義之
    名古屋大学大学院工学研究科エネルギー理工学専攻
  • 玉置 昌義
    名古屋大学大学院工学研究科エネルギー理工学専攻
  • 中村 秀夫
    日本原子力研究所東海研究所
  • 近藤 昌也
    日本原子力研究所東海研究所
  • 久木田 豊
    名古屋大学大学院工学研究科エネルギー理工学専攻 日本原子力研究所

書誌事項

タイトル別名
  • An Experimental Study on Interfacial Friction in Wavy-stratified Two-phase Flow in a Horizontal Rectangular Duct.
  • スイヘイ クケイ ダクトナイ ハジョウリュウ ニ オケル キエキ カイメン セ

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抄録

The interfacial shear stress was evaluated experimentally for a wavy, horizontally-stratified air/water two-phase flow. The experiments were conducted using a 0.7-m high, 12-m long rectangular duct for four different air superficial velocities (jg=4.2 to 6.8m/s) with water superficial velocity fixed at jl=0.3m/s.<br>The wall shear stress distribution was measured using a Preston tube at five locations along the test section. The wall friction coefficient, derived from the shear stress, deviated from the Blasius smooth-surface correlation with an increase in the wave amplitude, but stayed within ±30% of the correlation. Based on the measured wall shear stress, together with the measured static pressure drop and water level, the interfacial shear stress was evaluated from the one-dimensional steady-state momentum balance for the air flow. The derived interfacial shear stress τi increased with an increase in the wave amplitude which increase with both jg and the distance from the duct inlet L. The interfacial friction coefficient evaluated from τi was 4 to 10 times larger than the smooth-surface value, predicted by the Blasius correlation.

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