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Acoustically coupled gas bubbles in fluids: time-domain phenomena.
1Naval Research Laboratory, Stennis Space Center, Mississippi 39529-5004, USA. cf@nrlssc.navy.mil
The Journal of the Acoustical Society of America
|June 27, 2001
Summary
This study clarifies when to use multiple scattering versus self-consistent methods for analyzing bubble clouds. The choice depends on bubble damping (Q factor) and spacing, impacting acoustic scattering applications.
Area of Science:
- Acoustics
- Fluid Dynamics
- Wave Scattering
Background:
- Previous work introduced a coupled oscillator formalism for multiple gas bubbles in fluids.
- Time-domain investigations explored impulse responses of coupled bubble systems.
Purpose of the Study:
- To determine conditions for applying multiple scattering versus self-consistent methodologies for ensemble bubble scattering.
- To provide guidance for acoustic scattering applications in various media.
Main Methods:
- Analysis of coupled oscillator formalism for collective resonances and scattering.
- Time-domain investigations of impulse responses for coupled systems.
- Evaluation of the influence of individual scatterer Q factor and spatial separation.
Main Results:
- Identified that scatterer Q and spatial separation dictate the appropriate scattering methodology.
- Multiple scattering is suitable for highly damped or sparse systems (e.g., gassy seabed).
- Self-consistent methodology is indicated for strongly coupled systems (e.g., dense bubble clouds).
Conclusions:
- The choice between multiple scattering and self-consistent approaches is critical for accurate modeling of bubble ensembles.
- Findings have direct implications for both volume and bottom scattering applications in acoustics.
- Understanding these conditions enhances the predictive capability for acoustic interactions with bubbly media.