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A method to account for acoustic microstreaming when predicting bubble growth rates produced by rectified diffusion.
1Department of Biophysics, School of Medicine and Dentistry, University of Rochester, New York 14642.
The Journal of the Acoustical Society of America
|November 1, 1988
Summary
This study quantifies acoustic microstreaming effects on bubble growth rates during rectified diffusion. It introduces a new decay time calculation, improving theoretical predictions in low kHz ranges.
Area of Science:
- Physics
- Acoustics
- Fluid Dynamics
Background:
- Rectified diffusion describes bubble growth in sound fields.
- Acoustic microstreaming influences bubble dynamics but requires quantitative analysis.
- Existing theories need reinterpretation to incorporate microstreaming effects.
Purpose of the Study:
- To quantitate the effect of acoustic microstreaming on bubble growth rates.
- To present a reinterpretation of existing theory for rectified diffusion.
- To define and calculate 'decay time' considering microstreaming.
Main Methods:
- Theoretical reinterpretation of rectified diffusion.
- Development of a method to calculate decay time based on streaming velocity and bubble radius.
- Comparison of theoretical predictions with experimental data.
Main Results:
- The study presents a new theoretical framework for rectified diffusion.
- Calculated decay time effectively incorporates microstreaming effects.
- Theoretical predictions show reasonable agreement with experimental results in the low kHz range.
- Theoretical results are presented for higher frequencies (1-10 MHz) and pressures (1 and 4 bar).
Conclusions:
- Acoustic microstreaming significantly impacts bubble growth rates.
- The reinterpreted theory provides a quantitative understanding of these effects.
- The model shows good agreement with experimental data, validating its utility.