Journal of the Korean Society of Visualization (한국가시화정보학회지)

The Korean Society of Visualization (한국가시화정보학회)
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Measurement of Bubble Diameter and Rising Velocity in a Cylindrical Tank using an Optical Fiber Probe and a High Speed Visualization Technique

광섬유 탐침과 고속가시화 기법을 이용한 원형탱크 내부의 기포직경 및 상승속도 측정

  • 김규락 (부산대학교 대학원 기계공학과) ;
  • 최성환 (부산대학교 대학원 기계공학과) ;
  • 김윤기 (부산대학교 대학원 기계공학과) ;
  • 김경천 (부산대학교 대학원 기계공학과)
  • Received : 2012.06.07
  • Accepted : 2012.06.14
  • Published : 2012.09.30
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Abstract

An optical fiber probe system for measuring the local void fraction in the air-water two-phase flow was developed with a 1550 nm light source. Air was injected through a nozzle placed in the center of the bottom wall of a water-filled cylindrical tank. The optical fiber probe having a diameter of $125{\mu}m$ was sufficiently thin to resolve the air-water interface of the bubbly flows. To verify the performance of the optical fiber probe, the synchronized high speed visualization study using a high speed camera was carried out. Comparison between the optical signals and the instantaneous bubble diffraction images confirms that the optical fiber probe is very accurate to measure the void fraction in two-phase flows. The estimated bubble diameter and the rising velocity by the optical fiber probe have 1% and 5% of accuracy, respectively.

Keywords

References

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