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Related Experiment Videos

Multibubble sonoluminescence enhancement by fluid flow.

Shin-ichi Hatanaka1, Hideto Mitome, Kyuichi Yasui

  • 1Department of Applied Physics and Chemistry, The University of Electro-Communications, Chofugaoka, Chofu, Tokyo, Japan. hatanaka@pc.uec.ac.jp <hatanaka@pc.uec.ac.jp>

Ultrasonics
|August 1, 2006
PubMed
Summary

Forced fluid flow enhances multibubble sonoluminescence (SL) by preventing bubble coalescence. Optimal flow speed depends on ultrasonic power and frequency for maximum sonochemical luminescence (SCL) and SL intensity.

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Area of Science:

  • Acoustics
  • Physical Chemistry
  • Fluid Dynamics

Background:

  • Multibubble sonoluminescence (SL) intensity can be quenched by bubble coalescence and clustering.
  • Forced fluid flow, such as directional or rotating flow, can potentially mitigate bubble coalescence.

Purpose of the Study:

  • To investigate the effect of forced fluid flow on multibubble sonoluminescence (SL) and sonochemiluminescence (SCL).
  • To determine the mechanism behind flow-induced enhancement of SL and SCL.
  • To identify the optimal flow conditions for maximizing SL and SCL intensities.

Main Methods:

  • Experimental setup involving a circulator for directional flow and a stirrer for rotating flow.
  • Measurement of SL intensity in distilled water and SCL intensity in an aqueous luminol solution.

Related Experiment Videos

  • Systematic variation of fluid flow speed, ultrasonic power, and frequency.

    • Main Results:

    • Forced fluid flow, similar to both circulator and stirrer effects, enhances multibubble SL.
    • The enhancement mechanism involves preventing cavitation bubble coalescence and clustering.
    • SCL intensity in luminol solution increased more significantly with flow speed at higher ultrasonic powers compared to SL in distilled water.
    • At low ultrasonic powers, both SL and SCL intensities decreased with increasing flow speed.

    Conclusions:

    • Forced fluid flow is an effective method for enhancing multibubble sonoluminescence and sonochemiluminescence.
    • The flow-induced suppression of bubble coalescence is the primary mechanism for SL enhancement.
    • An optimal flow speed exists, dependent on ultrasonic power and frequency, for maximizing luminescence intensities.