Rod-shaped cavitation bubble structure in ultrasonic field
Lixin Bai1, Pengfei Wu2, Huiyu Liu3
1State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China.
Ultrasonics Sonochemistry
|April 23, 2018
Summary
Ultrasonic cavitation in thin liquid layers forms stable rod-shaped structures that evolve into Y-branch patterns. These structures are influenced by bubble interactions and pressure gradients, revealing insights into cavitation dynamics.
Area of Science:
- Physics
- Fluid Dynamics
- Acoustics
Background:
- Cavitation bubble dynamics in thin liquid layers under ultrasonic fields are complex.
- Understanding the structural evolution of cavitation is crucial for various applications.
Purpose of the Study:
- To experimentally investigate the formation and characteristics of rod-shaped cavitation bubble structures in thin liquid layers.
- To analyze the stability, evolution, and branching patterns of these structures.
Main Methods:
- Experimental investigation of cavitation structures in thin liquid layers subjected to an ultrasonic field.
- Observation and analysis of bubble distribution, structure formation, and branching angles.
- Qualitative analysis of curved rod-shaped structures using a derived formula.
Main Results:
- Cavitation structures exhibit distinct stages with varying liquid layer thickness.
- Rod-shaped structures form stable boundaries and can link into Y-branch structures with a Gaussian angle distribution (μ=119.93°).
- Bjerknes forces drive bubble convergence in special rod-shaped structures, leading to alignment along the central axis.
Conclusions:
- Rod-shaped cavitation structures are stable features in thin liquid layers.
- The formation of Y-branch structures is a key evolutionary pathway for cavitation clouds.
- The study provides a detailed analysis of cavitation bubble behavior and structure formation under ultrasonic influence.
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