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Effects of interaction between two bubble scatterers

Kapodistrias¹, Dahl

¹Department of Mechanical Engineering, University of Washington, Seattle 98195, USA.

The Journal of the Acoustical Society of America

|June 30, 2000

Summary

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This study investigates sound backscattering from two bubbles. Multiple scattering causes oscillations, with maximum backscattered sound when bubble separation is half the acoustic wavelength.

Area of Science:

Acoustics
Fluid Dynamics
Wave Scattering

Background:

Understanding acoustic scattering from multiple objects is crucial in various fields.
Previous studies often simplified interactions or focused on single scatterers.

Purpose of the Study:

To theoretically and experimentally investigate the backscattering of sound from two regularly arranged bubbles.
To analyze the impact of multiple scattering on acoustic radiation.

Main Methods:

Utilized a bistatic acoustic system for interrogating bubble scatterers.
Employed an exact, closed-form solution derived from multiple scattering series for calculations.
Varied bubble separation (2d) and acoustic wave number (k) to cover kd range of 0.2-21.

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Main Results:

Experimental results closely matched theoretical calculations.
Multiple scattering was found to induce oscillatory behavior in coherent scattering.
Maximum backscattered radiation occurred at an interbubble distance of approximately half the acoustic wavelength (λ/2).

Conclusions:

The study validates theoretical models for acoustic scattering from two bubbles.
Demonstrated the significant influence of multiple scattering on acoustic radiation patterns.
Identified optimal bubble arrangements for maximizing or minimizing backscattered sound.