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

  • 제39권7호
  • /
  • Pages.549-555
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  • 2015
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  • 1226-4881(pISSN)
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  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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적외선 입자추적유속계를 이용한 액체-기체 분리유동 시 계면속도 측정기법 개발 및 검증

Development and Validation of a Measurement Technique for Interfacial Velocity in Liquid-gas Separated Flow Using IR-PTV

  • 김상은 (경희대학교 원자력공학과) ;
  • 김형대 (경희대학교 원자력공학과)
  • 투고 : 2014.12.11
  • 심사 : 2015.05.25
  • 발행 : 2015.07.01
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초록

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.

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.

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참고문헌

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피인용 문헌

  1. Semi-mechanistic model for the interfacial velocity of gravity-driven laminar wavy film flow and its validation using infrared particle tracing velocimetry pp.1432-1181, 2018, https://doi.org/10.1007/s00231-018-2523-z