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Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations
Published on: August 21, 2018
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Numerical simulation of single bubble dynamics under acoustic standing waves
Sicong Qiu1, Xiaojian Ma1, Biao Huang1
1School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China.
Ultrasonics Sonochemistry
|September 4, 2018
Summary
This study numerically simulates single bubble dynamics in acoustic standing waves, revealing how bubble size relative to resonance size dictates liquid jet direction. Increased acoustic pressure amplitude accelerates bubble collapse.
Area of Science:
- Acoustics
- Fluid Dynamics
- Computational Physics
Background:
- Acoustic standing waves induce complex forces on bubbles.
- Previous research (Ma et al., 2018) established a foundation for this study.
- Understanding bubble dynamics near boundaries is crucial for various applications.
Purpose of the Study:
- To numerically simulate single bubble dynamics under acoustic standing waves.
- To investigate the influence of acoustic radiation force on bubble behavior.
- To analyze the effect of parameters like pressure amplitude, wave number, and bubble size on bubble collapse and jet formation.
Main Methods:
- Utilized the Navier-Stokes equation to model bubble dynamics.
- Incorporated acoustic radiation forces into the simulation.
- Performed numerical simulations to capture transient shape variations, pressure fluctuations, and bubble motion.
Main Results:
- Bubbles deform and generate high-speed liquid jets due to interaction with acoustic standing waves.
- Toroidal bubble collapse near a rigid boundary creates significant pressure and velocity peaks.
- Bubble jet direction depends on bubble radius relative to resonance size: towards the node for larger bubbles, towards the antinode for smaller bubbles.
- Higher acoustic pressure amplitude leads to earlier bubble collapse.
Conclusions:
- Bubble dynamics in acoustic standing waves are highly sensitive to resonance radius.
- The primary Bjerknes force significantly influences jet direction for smaller bubbles.
- Acoustic pressure amplitude is a key factor controlling the timing of bubble collapse and deformation.
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