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Related Experiment Video

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A Microfluidic System with Surface Patterning for Investigating Cavitation Bubble(s)–Cell Interaction and the Resultant Bioeffects at the Single-cell Level

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Cavitation-induced shock wave behaviour in different liquids.

Mohammad Khavari¹, Abhinav Priyadarshi², Justin Morton²

¹School of Computing and Engineering, College of Science and Engineering, University of Derby, Derby DE22 3AW, United Kingdom; Faculty of Technology, Design and Environment, Oxford Brookes University, Oxford OX33 1HX, United Kingdom.

Ultrasonics Sonochemistry

|February 21, 2023

Summary

Investigating shock waves from bubble collapse, this study found ethanol-water solutions generate significant pressure peaks, unlike pure ethanol or glycerol. These findings are crucial for understanding ultrasonic cavitation effects.

Keywords:

Bubble cloud Shock wave Ultrasonic cavitation

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A Microfluidic System with Surface Patterning for Investigating Cavitation Bubble(s)–Cell Interaction and the Resultant Bioeffects at the Single-cell Level

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Area of Science:

Acoustics
Fluid Dynamics
Materials Science

Background:

Ultrasonic cavitation generates shock waves during bubble collapse.
Previous work identified high-frequency pressure peaks in water due to shock waves.

Purpose of the Study:

To investigate the influence of liquid physical properties on shock wave characteristics.
To compare shock wave phenomena in water, ethanol, glycerol, and an ethanol-water solution.

Main Methods:

Experiments involved ultrasonic excitation at 24 kHz.
Pressure frequency spectra were analyzed from over 1.5 million cavitation bubble collapse events.
Acoustic pressure maps were constructed for qualitative analysis.

Main Results:

Prominent shock wave pressure peaks were detected in water and the ethanol-water solution, but not in ethanol or glycerol.
The ethanol-water solution exhibited higher overall acoustic pressure amplitudes.
Distinct shock wave features, including MHz frequency peaks and sub-harmonic generation, were observed.

Conclusions:

Liquid properties significantly affect shock wave formation and characteristics during cavitation.
Ethanol-water solutions show potential for enhanced pressure generation in ultrasonic applications.
Mist-like patterns in ethanol-water solutions correlate with increased acoustic pressures.