Cavitation bubble collapse in a vicinity of a liquid-liquid interface - Basic research into emulsification process
Uroš Orthaber1, Jure Zevnik1, Rok Petkovšek1
1Faculty of Mechanical Engineering, University of Ljubljana, Askerceva 6, 1000 Ljubljana, SI, Slovenia.
Ultrasonics Sonochemistry
|June 20, 2020
Summary
Ultrasonic cavitation bubbles interact uniquely with liquid interfaces, jetting towards lighter liquids and away from denser ones. This research offers new insights into ultrasonic emulsification physics.
Area of Science:
- Fluid dynamics
- Physical chemistry
- Acoustics
Background:
- Previous research observed complex phenomena near liquid interfaces under ultrasonic cavitation.
- Limited studies exist on cavitation bubble interactions with liquid-liquid interfaces.
Purpose of the Study:
- To investigate single cavitation bubble dynamics at the oil-water interface.
- To understand bubble-interface interactions like deformation and penetration.
- To provide insights into ultrasonic emulsification.
Main Methods:
- Experimental observation of single cavitation bubble dynamics.
- Numerical simulations of bubble behavior.
- Analysis of bubble characteristics and anisotropy parameter.
Main Results:
- Bubbles were observed on both sides of the oil-water interface.
- Bubble jetting direction was predicted by the anisotropy parameter: towards the interface in lighter liquids, away in denser liquids.
- Relationships between bubble characteristics and anisotropy were analyzed.
Conclusions:
- The study elucidates the physics of cavitation bubble behavior at liquid-liquid interfaces.
- Findings contribute to a deeper understanding of ultrasonic emulsification processes.
- The anisotropy parameter is key in predicting bubble jetting direction.
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