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Two-frequency driven single-bubble sonoluminescence.

Dagmar Krefting1, Robert Mettin, Werner Lauterborn

  • 1Drittes Physikalisches Institut, Universität Göttingen, Germany.

The Journal of the Acoustical Society of America
|November 15, 2002
PubMed
Summary
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Dual-frequency driving of single-bubble sonoluminescence (SBSL) enhances light output. However, long-term stability shows minimal difference between single and dual-frequency excitation.

Area of Science:

  • Acoustics
  • Fluid Dynamics
  • Physical Chemistry

Background:

  • Single-bubble sonoluminescence (SBSL) is a phenomenon where bubbles emit light when driven by sound waves.
  • Previous studies suggested dual-frequency excitation could significantly boost SBSL light output.

Purpose of the Study:

  • To experimentally and numerically investigate single-bubble sonoluminescence driven by two harmonic frequencies (25 kHz and 50 kHz).
  • To map the light emission region in a parameter space defined by driving pressures and phase.
  • To compare the stability and brightness of dual-frequency SBSL with single-frequency excitation.

Main Methods:

  • Experimental setup for single-bubble sonoluminescence in an air/water system.
  • Numerical modeling of spherical bubble oscillations, considering diffusive and shape stability.

Related Experiment Videos

  • Parameter space mapping of driving pressure amplitudes and relative phase.

    • Main Results:

    • Dual-frequency excitation enhanced maximum brightness by up to 2.5 times compared to single-frequency excitation.
    • Experimental and numerical results showed good agreement for light output, bubble radius, and stability.
    • Long-term measurements revealed significant variations in emission for both single and dual-frequency SBSL.

    Conclusions:

    • Dual-frequency driving can temporarily increase SBSL brightness.
    • Bubble stability and long-term emission consistency are crucial factors.
    • The overall maximum brightness over extended periods showed little difference between single and dual-frequency methods.