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Eliminating high-order scattering effects in optical microbubble sizing.

Huihe Qiu1

  • 1Department of Mechanical Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong. meqiu@ust.hk

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|April 10, 2003
PubMed
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High-order refractions impact microbubble sizing accuracy with phase-Doppler anemometry (PDA). A new model accounts for these refractions, improving bubble size measurements in multiphase flows.

Area of Science:

  • Fluid dynamics
  • Optical measurement techniques

Background:

  • Accurate bubble size and velocity measurements are crucial for multiphase flow research and industrial applications.
  • Conventional phase-Doppler anemometry (PDA) sizing accuracy is significantly affected by high-order optical refractions.

Purpose of the Study:

  • To investigate the impact of high-order refractions on microbubble sizing using PDA.
  • To develop an improved phase-size correlation model that incorporates high-order refractions for enhanced accuracy.

Main Methods:

  • Developed a novel phase-size correlation model relaxing the single-scattering assumption of conventional PDA.
  • Performed simulations comparing the new model against single-scattering and first-order models.
  • Suggested an optimization method for precise air bubble sizing in aqueous environments.

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Main Results:

  • The new model demonstrates improved accuracy in microbubble sizing compared to existing methods.
  • Simulation results highlight the significance of considering high-order refractions for accurate measurements.
  • The proposed optimization method provides a pathway for reliable air bubble characterization.

Conclusions:

  • High-order refractions are a critical factor influencing PDA-based microbubble sizing.
  • The developed model offers a more robust approach to bubble sizing by accounting for complex optical phenomena.
  • This work contributes to more accurate characterization of bubbles in multiphase systems.