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

The Korean Society of Mechanical Engineers (대한기계학회)
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Development and Validation of a Measurement Technique for Interfacial Velocity in Liquid-gas Separated Flow Using IR-PTV

적외선 입자추적유속계를 이용한 액체-기체 분리유동 시 계면속도 측정기법 개발 및 검증

  • 김상은 (경희대학교 원자력공학과) ;
  • 김형대 (경희대학교 원자력공학과)
  • Received : 2014.12.11
  • Accepted : 2015.05.25
  • Published : 2015.07.01
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Abstract

A measurement technique of interfacial velocity in air-water separated flow by particle tracking velocimetry using an infrared camera (IR-PTV) was developed. As infrared light with wavelength in the range of 3-5 um could hardly penetrate water, IR-PTV can selectively visualize only the tracer particles existing in depths less than 20 um underneath the air-water interface. To validate the measurement accuracy of the IR-PTV technique, a measurement of the interfacial velocity of the air-water separated flow using Styrofoam particles floating in water was conducted. The interfacial velocity values obtained with the two different measurement techniques showed good agreement with errors less than 5%. It was found from the experimental results obtained using the developed technique that with increasing air velocity, the interfacial velocity proportionally increases, likely because of the increased interfacial stress.

적외선 카메라를 이용한 입자추적유속계(IR-PTV)를 활용하여 물-공기 분리유동 시 계면속도를 측정하는 기법을 개발하였다. $3-5{\mu}m$ 파장대의 적외선은 물에 대해 $20{\mu}m$ 이하의 침투 깊이를 가지므로 입자추적유속계 기법에 활용 시 물-공기 계면 근처에 존재하는 추적입자들의 이동속도를 선택적으로 측정할 수 있다. IR-PTV 기법의 측정 정확도를 검증하기 위하여 물에 잘 뜨는 스티로폼 입자를 이용하여 $10^{\circ}$ 기울어진 경사면에서 공기-물 분리유동 시 계면속도를 측정하여 비교한 결과 5% 이내의 오차를 보이면서 잘 일치하였다. 개발한 기법을 이용하여 획득한 실험결과로부터 공기 속도가 증가함에 따라 계면속도가 비례하여 증가하는 것을 관찰하였으며 이는 계면전단력의 증가에 의한 것으로 해석된다.

Keywords

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