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Related Experiment Videos

Acoustic einstein-hopf drag on a bubble

Larraza1, Tucholski

  • 1Department of Physics-Code PH/La, Naval Postgraduate School, Monterey, California 93943, USA.

Physical Review Letters
|October 6, 2000
PubMed
Summary
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Acoustic noise can alter bubble drag, offering a new method to control bubble behavior. Specifically, band-limited noise matching a bubble

Area of Science:

  • Fluid dynamics
  • Acoustics
  • Bubble dynamics

Background:

  • The drag force on a bubble influences its motion and associated transport phenomena.
  • Acoustic fields can interact with bubbles, potentially modifying their dynamics.
  • Previous work explored electromagnetic analogs for particle interactions.

Purpose of the Study:

  • To investigate the theoretical effect of isotropic, homogeneous, broadband acoustic noise on bubble drag.
  • To explore the potential for acoustic noise to reduce bubble drag.
  • To identify potential applications of acoustic noise-modified bubble dynamics.

Main Methods:

  • Theoretical analysis of bubble dynamics under acoustic noise.
  • Comparison with Einstein-Hopf drag in electromagnetic systems.

Related Experiment Videos

  • Examination of the role of noise spectrum overlap with bubble resonance.

    • Main Results:

    • Isotropic, homogeneous, broadband acoustic noise can modify bubble drag.
    • Band-limited acoustic noise can reduce drag when its lower frequency aligns with bubble resonance.
    • This effect is an acoustic analog to Einstein-Hopf drag but with distinct characteristics.

    Conclusions:

    • Acoustic noise presents a tunable parameter for controlling bubble drag.
    • Reduced drag via specific acoustic noise profiles has implications for various applications.
    • Potential applications include enhanced bubble migration, heat transfer, and acoustophoresis.