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Acoustic tokamak with strongly coupled toroidal bubbles.

A Caumont¹, O Stephan¹, E Bossy¹

¹Univ. Grenoble Alpes, CNRS, LIPhy, F-38000 Grenoble, France.

Physical Review. E

|November 18, 2023

Summary

Researchers created an "acoustic tokamak" using gas bubbles in 3D-printed cages. This novel arrangement exhibits unique acoustic properties, including a lower fundamental frequency due to bubble interactions.

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Area of Science:

Acoustic physics
Materials science
Fluid dynamics

Background:

Gas bubbles can act as acoustic resonators.
3D-printed structures offer novel ways to control bubble behavior.
Toroidal shapes present unique topological properties.

Purpose of the Study:

To investigate the acoustic properties of gas bubbles stabilized in toroidal 3D-printed cages.
To explore the collective acoustic behavior of bubbles arranged in a circular array (acoustic tokamak).
To analyze the acoustic modes and field homogeneity within the acoustic tokamak.

Main Methods:

Experimental setup with gas bubbles in toroidal 3D-printed cages.
Theoretical modeling of acoustic interactions.
3D simulations to visualize acoustic fields.

Main Results:

Gas bubbles in toroidal cages function as effective acoustic resonators.
The acoustic tokamak exhibits distinct acoustic modes arising from inter-bubble interactions.
A significant reduction in the fundamental acoustic mode frequency was observed compared to individual bubbles.
3D simulations revealed a homogeneous acoustic field along the circular array.

Conclusions:

The acoustic tokamak demonstrates a novel system for acoustic wave manipulation.
The observed low-frequency mode and field homogeneity have potential applications in acoustics.
This study highlights the interplay between topology, bubble dynamics, and acoustic resonance.