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Visualization of bubble-fluid interaction by a moving object flow image analyzer system.

H M Choi1, T Terauchi, H Monji

  • 1Institute of Engineering Mechanics and Systems, University of Tsukuba, Japan. hmchoi@kriss.re.kr

Annals of the New York Academy of Sciences
|December 24, 2002
PubMed
Summary

This study visualizes bubble-fluid interaction using a moving object flow image analyzer (MOFIA). Bubble characteristics like shape and size influence its motion, wake shedding, and the surrounding flow field.

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Area of Science:

  • Fluid Dynamics
  • Multiphase Flow

Background:

  • Understanding bubble dynamics is crucial in various industrial and natural processes.
  • Visualizing the complex interplay between bubbles and surrounding fluids requires advanced imaging techniques.

Purpose of the Study:

  • To investigate the interaction between rising bubbles and the fluid environment.
  • To simultaneously measure bubble dynamics and fluid velocity fields.

Main Methods:

  • Utilized a Moving Object Flow Image Analyzer (MOFIA), integrating a 3D Moving Object Image Analyzer (3D-MOIA) and 2D Particle Image Velocimetry (PIV).
  • Conducted experiments with rising bubbles of varying sizes and shapes in stagnant water within a vertical pipe.

Main Results:

  • Simultaneously captured 3D bubble position, shape, and the fluid velocity field.

Related Experiment Videos

  • Demonstrated that bubble shape, size, and density significantly characterize the bubble-fluid interaction.
  • Observed distinct characteristics in bubble motion, wake shedding, and the resulting flow field based on bubble properties.

    • Conclusions:

    • Bubble-fluid interaction is fundamentally governed by the bubble's physical attributes.
    • The MOFIA system provides a comprehensive tool for analyzing multiphase flow phenomena.
    • Detailed insights into bubble motion and flow field alterations were achieved.