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Flow Characteristics in a Particle/Bubble Motion with Hybride PIV

Hybride PIV에 의한 단일입자/기포운동에 관한 연구

  • 최해만 (한국표준과학연구원 유체유동그룹, Tsukuba 대학 기능공학과) ;
  • 사내강 (Tsukuba 대학 기능공학과) ;
  • 문자수명 (Tsukuba 대학 기능공학과) ;
  • 송정강일 (Tsukuba 대학 기능공학과)
  • Published : 2002.03.01

Abstract

As the first step to investigate the fundamental mechanism of a dispersed two-phase flow, we studied the detailed interactions between bubble or particle motion and flow around it. Experiments were carried out with a rising bubble or particle in stagnant water in a vertical pipe. Particles with different densities, and/or different shapes were used for comparison with a bubble. We adopted 3D-PTV (Three-Dimensional Particle Tracking Velocimetry) for measuring the bubble or particle motions, and PIV (Particle Image Velocimetry) for measuring the water flow simultaneously (Hybrid PIV). The experimental results showed that the oblate spheroidal solid particle rose along the longer axis direction at the point that the inclination of the longer axis reached the maximum, and the inclination direction changed after moving. The bubble moved to the direction that the spheroid's projected width grew up to the largest, and the minor axis of the oblate spheroidal body of the bubble was parallel to the moving direction. The trajectory of the center of the particle/bubble which was measured with 3D-PTV, was marked on the section (x-y) of the pipe. It exhibited the pattern of the particle/bubble motion.

Keywords

References

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