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Activating Molecules, Ions, and Solid Particles with Acoustic Cavitation

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Sonoluminescence from single cavitation bubbles near solid surfaces.

Jaka Mur¹, Rok Petkovsek², Claus-Dieter Ohl³

¹Faculty of Natural Sciences, Institute for Physics, Department Soft Matter, Otto-von-Guericke University Magdeburg, 39106 Magdeburg, Germany; Faculty of Mechanical Engineering, University of Ljubljana, Askerceva 6, 1000 Ljubljana, Slovenia.

Ultrasonics Sonochemistry

|March 19, 2026

Summary

This summary is machine-generated.

Researchers observed light emission during asymmetric bubble collapse near surfaces, a phenomenon previously linked only to erosion. This study finds light and erosion occur at the same time but are driven by different energy focusing mechanisms.

Keywords:

Cavitation Cavitation erosion Laser-induced breakdown Sonoluminescence Time-resolved imaging

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Area of Science:

Acoustics
Fluid Dynamics
Plasma Physics

Background:

Sonoluminescence involves light emission from oscillating bubbles.
Asymmetric bubble collapse near surfaces causes extreme pressure and erosion.
A link between sonoluminescence and erosion has not been previously established.

Purpose of the Study:

To investigate light emission from asymmetric toroidal cavitation bubble collapse near solid boundaries.
To determine if sonoluminescence and erosion are connected phenomena.
To understand the distinct energy focusing pathways involved.

Main Methods:

Multi-modal measurements of bubble dynamics near solid surfaces.
Observation of highly asymmetric toroidal cavitation bubble collapse.
Analysis of light emission and erosive effects.

Main Results:

Light emission was observed from asymmetric bubble collapses causing erosion.
Light emission occurred exclusively at sites and times of intense flow focusing.
No correlation was found between sonoluminescence occurrence and erosion.

Conclusions:

Asymmetric bubble collapse near surfaces can produce both light and erosion.
Light emission and erosion result from distinct energy focusing pathways.
This study differentiates the mechanisms of energy focusing in bubble dynamics.