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Activating Molecules, Ions, and Solid Particles with Acoustic Cavitation
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Particulate Projectiles Driven by Cavitation Bubbles.

Zibo Ren1, Zhigang Zuo1, Shengji Wu1

  • 1State Key Laboratory of Hydroscience and Engineering, and Department of Energy and Power Engineering, Tsinghua University, 100084 Beijing, China.

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|February 11, 2022
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Summary
This summary is machine-generated.

Laser-induced cavitation bubbles unexpectedly launch heavy metal particles like projectiles. Particle motion depends on bubble size and initial position, revealing two distinct acceleration regimes for particle manipulation.

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Area of Science:

  • Fluid dynamics
  • Acoustics
  • Materials science

Background:

  • Particle removal typically relies on bubble collapse-induced stresses.
  • Laser-induced cavitation bubbles offer a non-contact method for particle manipulation.

Purpose of the Study:

  • To investigate the unexpected projectile-like acceleration of heavy metal particles by laser-induced cavitation bubbles.
  • To identify the key parameters and physical regimes governing this phenomenon.

Main Methods:

  • Experimental observation of millimeter-sized particle acceleration using laser-induced cavitation.
  • Theoretical modeling to determine particle motion based on bubble dynamics and initial conditions.

Main Results:

  • Identified two dominant acceleration regimes: unsteady liquid inertia and bubble contact.
  • Discovered scaling laws for particle displacement (fourth and square power laws) based on bubble and particle size, and initial distance.
  • Demonstrated particle motion is governed by maximum bubble radius, initial distance, and azimuth angle.

Conclusions:

  • Laser-induced cavitation can induce significant projectile-like motion in heavy metal particles.
  • The findings provide a new mechanism for nonintrusive particle manipulation from solid substrates in liquids.