Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Measurement of the Void Fraction of Slug and Bubbly Flows Using Three-Ring Impedance Meters

3-ring 임피던스미터를 이용한 슬러그류 및 기포류의 기공률 측정

  • 김종록 (포항공과대학교 기계공학과) ;
  • 안예찬 (부경대학교 의공학과) ;
  • 김무환 (포항공과대학교 첨단원자력공학부)
  • Received : 2011.08.17
  • Accepted : 2011.10.18
  • Published : 2012.01.01
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Abstract

Real slug and bubbly flows were measured using a three-ring impedance meter that can efficiently measure the void fraction of two-phase flows in a tube. First, the fitting curves between the signal from the impedance meters and the void fraction were found. The impedance meter had different fitting curves for slug and bubbly flows that had the same void fraction. An impedance meter should choose one of the two fitting curves according to the flow pattern, and the flow patterns can be recognized using the measured void fraction. The velocities and sizes of the bubbles were calculated using the void fraction curves measured by two impedance meters.

관내 2상 유동의 기공률을 효과적으로 측정할 수 있는 3-ring 임피던스미터를 이용하여 실제 슬러그류 및 기포류를 측정하였다. 먼저, 임피던스미터의 신호와 기공률 사이의 보정곡선을 구하였다. 임피던스미터는 동일한 기공률을 갖는 슬러그류와 기포류에 대해 각각 다른 보정곡선을 나타내는 특성을 보였다. 임피던스미터는 유동패턴에 따라 두 보정 곡선 중 하나를 선택해야 하며, 기공률 측정 결과로 부터 유동 패턴을 판단할 수 있었다. 두 개의 임피던스미터를 통해 측정된 기공률 변화 곡선으로부터 기포의 이동 속도, 크기를 효과적으로 측정할 수 있었다.

Keywords

References

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