Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
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Two-Phase Flow Regimes for Counter-Current Air-Water Flows in Narrow Rectangular Channels

  • Kim, Byong-Joo (Professor, Department of Mechanical and System Design Engineering, Hongik University) ;
  • Sohn, Byung-Hu (Graduate Student, Department of Mechanical and System Design Engineering, Hongik University) ;
  • Siyoung Jeong (Professor, Department of Mechanical Engineering, Sogang University)
  • Published : 2001.07.01
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Abstract

A study of counter-current two-phase flow in narrow rectangular channels has been performed. Two-phase flow regimes were experimentally investigated in a 760mm long and 100mm wide test section with 2.0 and 5.0mm gap widths. The resulting flow regime maps were compared with the existing transition criteria. The experimental data and the transition criteria of the models showed relatively good agreement. However, the discrepancies between the experimental data and the model predictions of the flow regime transition become pronounced as the gap width increased. As the gap width increased the transition gas superficial velocities increased. The critical void fraction for the bubbly-to-slug transition was observed to be about 0.25. The two-phase distribution parameter for the slug flow was larger for the narrower channel. The uncertainties in the distribution parameter could lead to a disagreement in slug-to-churn transition between the experimental findings and the transition criteria. For the transition from churn to annular flow the effect of liquid superficial velocity was found to be insignificant.

Keywords

References

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