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Modifying the cavitation bubble collapse in the erosive regime with a surface bar structure
Jiajun Cui1, Fabian Reuter2, Zibo Ren1
1State Key Laboratory of Hydroscience and Engineering, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China.
Ultrasonics Sonochemistry
|July 6, 2025
Summary
Introducing a slender bar boundary structure alters cavitation bubble collapse, creating distinct regimes. This research explores asymmetry
Area of Science:
- Fluid Dynamics
- Acoustics
- Materials Science
Background:
- Cavitation bubble collapse near surfaces causes severe erosion, particularly in turbines.
- Shock wave energy concentration during non-spherical collapse is a suspected erosion mechanism.
- Modifying boundary structures offers a strategy to mitigate cavitation erosion.
Purpose of the Study:
- To investigate how introducing asymmetry via a slender bar affects cavitation bubble dynamics.
- To quantitatively analyze the impact of asymmetry on shock wave self-focusing.
- To understand the role of boundary structures in controlling cavitation bubble collapse.
Main Methods:
- Utilized laser-induced cavitation bubbles and a slender bar as a symmetry-breaking boundary structure.
- Employed two high-speed cameras for quantitative observation of bubble collapse dynamics.
- Analyzed bubble morphology, dynamics, and shock wave focusing characteristics.
Main Results:
- Identified two distinct collapse regimes: Island-Bridge and Asymmetric Torus.
- Observed distinct trends in bubble dynamics and geometry with varying bubble-structure distances.
- Characterized collapse location and propagation velocity, influencing shock wave focusing.
Conclusions:
- Boundary structure asymmetry significantly influences cavitation bubble collapse and shock wave focusing.
- The study provides insights into designing surface microstructures for cavitation mitigation or energy concentration.
- Findings offer potential methodologies for engineering applications involving cavitation.
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