Journal of the Korean Society of Visualization (한국가시화정보학회지)

The Korean Society of Visualization (한국가시화정보학회)
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Dynamic Analysis of Bubble-Driven Liquid Flows in a Rectangular Tank

사각탱크 내부의 기포구동유동에 대한 동특성 연구

  • 김상문 (부산대학교 대학원 기계공학부) ;
  • 이승재 (부산대학교 대학원 기계공학부) ;
  • 김현동 (부산대학교 대학원 기계공학부) ;
  • 김종욱 (부산대학교 대학원 기계공학부) ;
  • 김경천 (부산대학교 기계공학부)
  • Received : 2009.12.08
  • Accepted : 2010.03.19
  • Published : 2010.03.31
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Abstract

An experimental study to evaluate dynamic structures of flow and turbulence characteristics in bubble-driven liquid flow in a rectangular tank with a varying flow rate of compressed air is conducted. Liquid flow fields are measured by time-resolved particle image velocimetry (PIV) with fluorescent tracer particles to eliminate diffused reflections, and by an image intensifier to acquire enhanced clean particle images. Instantaneous vector fields are investigated by using the two frame cross-correlation function and bad vectors are eliminated by magnitude difference technique. By proper orthogonal decomposition (POD) analysis, the energy distributions of spatial and temporal modes are acquired. When Reynolds number increases, bubble-induced turbulent motion becomes dominant rather than the recirculating flow near the side wall. The total kinetic energy transferred to the liquid from the rising bubbles shows a nonlinear relation regarding the energy input because of the interaction between bubbles and free surface.

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References

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