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Dynamic acoustic radiation force acting on cylindrical shells: theory and simulations
1National Institute of Health and Medical Research, INSERM Unit 556-Therapeutic Ultrasound Research Laboratory, 151 Cours Albert Thomas, 69424 Lyon, cedex 03, France. mitri@ieee.org
Ultrasonics
|April 13, 2005
Summary
This study expands the theory of acoustic radiation force to include hollow cylindrical shells. The dynamic radiation force on these shells is influenced by their thickness and internal contents, differing from static forces at higher modulation frequencies.
Area of Science:
- Acoustics
- Fluid Dynamics
- Materials Science
Background:
- Objects in acoustic fields experience steady forces from wave momentum transfer.
- Dynamic acoustic radiation force is defined for continuous wave-fields with slowly varying intensity.
- Existing theories primarily address solid cylinders.
Purpose of the Study:
- Extend dynamic acoustic radiation force theory to solid cylindrical shells.
- Investigate the influence of shell thickness and internal contents.
- Introduce and analyze a new factor, Y(d), for dynamic radiation force.
Main Methods:
- Theoretical extension of dynamic acoustic radiation force.
- Numerical calculations of the dynamic radiation force function Y(d).
- Analysis of variations due to material parameters and interior fluid.
Main Results:
- The dynamic radiation force on cylindrical shells depends on thickness and contents.
- A new factor Y(d) (dynamic radiation force per unit energy density and unit cross-sectional surface) is defined.
- Y(d) deviates from the static radiation force function Y(p) as modulation frequency increases.
Conclusions:
- The presented theory is more comprehensive than existing theories for cylinders.
- Shell thickness and internal fluid significantly affect dynamic radiation forces.
- Modulation frequency is a critical factor in the deviation from static radiation forces.