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Enhancing acoustic cavitation using artificial crevice bubbles.

Aaldert Zijlstra1, David Fernandez Rivas2, Han J G E Gardeniers2

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Summary
This summary is machine-generated.

Researchers investigated how stable gas pockets in micro-pits respond to ultrasound. Above a specific pressure, microbubbles detach, forming cavitation clouds, yet the pit remains active due to rectified gas diffusion.

Keywords:
BubbleCavitationHigh-speed imagingNucleationUltrasound

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Area of Science:

  • Fluid dynamics
  • Acoustics
  • Materials science

Background:

  • Pre-defined cavitation nuclei are crucial for understanding cavitation phenomena.
  • The behavior of gas pockets under acoustic driving is not fully understood.
  • Microscale cavitation in silicon or glass substrates presents unique challenges.

Purpose of the Study:

  • To investigate the dynamic response of stabilized gas pockets in micro-pits under continuous kHz acoustic driving.
  • To determine the acoustic pressure threshold for microbubble detachment and cavitation cloud formation.
  • To explain the sustained activity of cavitation nuclei despite gas loss.

Main Methods:

  • Utilizing pre-defined cavitation nuclei consisting of stabilized gas pockets within cylindrical pits (30 μm diameter) etched in silicon or glass.
  • Applying continuous acoustic driving in the kilohertz (kHz) regime (80, 100, and 200 kHz).
  • Observing the liquid-gas meniscus dynamics and microbubble detachment above a critical acoustic pressure threshold.

Main Results:

  • Above an acoustic pressure threshold, the liquid-gas meniscus transitions from stable vibration to expansion and deformation.
  • Microbubbles are continuously and intermittently ejected from the pits just above the threshold.
  • Elevated input powers lead to more frequent bubble detachment, forming cavitation bubble clouds near the pit.
  • The cavitation nuclei remain active despite gas loss, attributed to rectified gas diffusion.

Conclusions:

  • Acoustic pressure exceeding a threshold triggers microbubble detachment and cavitation cloud formation from stabilized gas pockets.
  • Rectified gas diffusion sustains the activity of cavitation nuclei, preventing deactivation even with continuous gas loss.
  • This study provides insights into controlled micro-cavitation generation and the underlying gas transport mechanisms.