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Updated: Feb 16, 2026

Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
Published on: May 9, 2021
Sub-wavelength focusing of acoustic waves in bubbly media
Habib Ammari1, Brian Fitzpatrick1, David Gontier2
1Department of Mathematics, ETH Zürich, Rämistrasse 101, 8092 Zürich, Switzerland.
Abstract:
The purpose of this paper is to investigate acoustic wave scattering by a large number of bubbles in a liquid at frequencies near the Minnaert resonance frequency. This bubbly media has been exploited in practice to obtain super-focusing of acoustic waves. Using layer potential techniques, we derive the scattering function for a single spherical bubble excited by an incident wave in the low frequency regime. We then propose a point scatterer approximation for N bubbles, and describe several numerical simulations based on this approximation, that demonstrate the possibility of achieving super-focusing using bubbly media.
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