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Updated: Jun 9, 2025
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Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
Published on: May 9, 2021
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A hovering bubble with a spontaneous horizontal oscillation
1Department of Aeronautics and Astronautics, Fudan University, Shanghai 200433, China.
Summary
Researchers created an active bubble that oscillates horizontally on a liquid surface using a laser. This controlled oscillation has potential for microrobots and drug delivery applications.
Area of Science:
- Physics
- Materials Science
- Fluid Dynamics
Background:
- Active matter exhibits complex motions crucial for engineering and biological systems.
- Typically, active objects require symmetry-broken structures, compositions, or interfacial activities.
- Understanding novel active matter systems is key to advancing technology.
Purpose of the Study:
- To report a novel active bubble system with spontaneous horizontal oscillation.
- To investigate the physical mechanism behind the bubble's synchronized oscillation.
- To explore controllable oscillation directions and potential applications.
Main Methods:
- Impacting a stationary laser beam into a liquid through a transparent solid cover.
- Observing and analyzing spontaneous bubble oscillation at the solid/liquid interface.
- Conducting scaling analysis of oscillation frequency and bubble trajectory.
Main Results:
- A spontaneously oscillating active bubble was generated at the solid/liquid interface.
- Bubble oscillation synchronized with interfacial temperature and hydrodynamic flow.
- Azimuthal rotation of bubble trajectory observed due to symmetry breaking.
- Demonstrated a controllable double pendulum system of oscillating bubbles.
Conclusions:
- The study presents a new physical mechanism for active bubble generation and oscillation.
- Findings advance the understanding of active matter and its multi-mode motions.
- Highlights potential applications in microrobots, drug delivery, and other bubble-mediated technologies.
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