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Updated: Apr 30, 2026

Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
Published on: May 9, 2021
Nonlinear modal evolution of microbubbles confined by rigid capillary constraint.
Xiuru Li1, Runyang Mo1, Yuting Wu1
1Shaanxi Key Laboratory of Ultrasonics, Shaanxi Normal University, Xi'an 710119, China.
Acoustic pressure modulates confined bubbles, causing cyclic shape changes. Stable surface modes occur within a narrow acoustic pressure range, revealing bubble evolution mechanisms.
Area of Science:
- Fluid dynamics
- Nonlinear acoustics
- Bubble dynamics
Background:
- Confined bubbles exhibit complex behaviors under external forces.
- Understanding bubble modal evolution is crucial for various applications.
Purpose of the Study:
- To investigate the nonlinear modal evolution of confined bubbles under modulated acoustic pressure.
- To elucidate the mechanisms governing bubble shape pattern evolution.
Main Methods:
- Applying modulated acoustic pressure to bubbles confined in capillaries.
- Analyzing bubble morphological evolution cycles, including oscillations and deformations.
- Utilizing time-resolved radius measurements and energy distribution spectrum analysis.
Main Results:
- Bubbles undergo cyclic morphological evolution: oscillation, unstable deformation, surface mode, and recovery.
- Bubble behavior is influenced by size, acoustic parameters, and capillary shape, with acoustics being dominant.
- Subharmonic responses, out-of-phase oscillations in bubble pairs, and chaotic states at higher frequencies were observed.
- A method for estimating deformation and modal thresholds was proposed, showing a narrow range for stable surface modes.
Conclusions:
- Acoustic conditions are dominant factors in confined bubble modal evolution.
- Stable surface modes are limited to a narrow acoustic pressure range.
- The study provides insights into the evolutionary mechanisms of bubble shape patterns.
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