Effects of Oscillation on Vapor-liquid Two-phase Flow Patterns in Small Horizontal Rectangular Tube

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  • ONO Masaharu
    Department of Mechanical Engineering and Intelligent Systems, The University of Electro- Communications
  • NAGAYAMA Kunihiro
    Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology
  • ENOKI Koji
    Department of Mechanical Engineering and Intelligent Systems, The University of Electro- Communications
  • AKISAWA Atsushi
    Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology
  • OKAWA Tomio
    Department of Mechanical Engineering and Intelligent Systems, The University of Electro- Communications
  • MORI Hideo
    Department of Mechanical Engineering, Kyushu University

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Other Title
  • 水平矩形微細流路内気液二相流の流動様相に及ぼす振動の影響
  • スイヘイ クケイ ビサイ リュウロ ウチキエキ ニソウリュウ ノ リュウドウ ヨウソウ ニ オヨボス シンドウ ノ エイキョウ

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<p>In this study, experiments were performed to observe horizontal vapor-liquid two-phase flow of refrigerant R 134a in the rectangular glass channel whose hydraulic diameter was 0.84 mm by using a high-speed camera. The experiment results of flow patterns were compared with existing flow pattern map. Further, the effects of oscillation on slug and stratified flow were investigated by observing flow as a reciprocating motor vertically oscillated the channel. The slug flow was observed at heat fluxes of 2.5 and 9.5 kW<tt>･</tt>m-2, and the stratified flow was at a heat flux of 2.5 kW<tt>･</tt>m-2. When the channel was oscillated at certain frequency and amplitude, the thin liquid film around vapor plug was largely waved up and down. As the result, the dry surface around vapor plug of slug flow, which is considered as a reason for decline in heat transfer coefficient, did not occur. Furthermore, stratified flow was transformed to annular flow, and dry surface on upper side of the channel also did not occur. These effects and transformation were classified into several patterns, and the influence of maximum acceleration was examined.</p>

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