How Dissolved Gas and High-Intensity Ultrasound Are Coupled to Affect Bubble Cavitation

Area of Science:

• Physics
• Chemistry
• Materials Science

Background:

• Bubble cavitation is crucial for ultrasound applications.
• Ultrasound-induced cavitation presents complex challenges to current understanding.
• Nanoscale bubble dynamics under ultrasound require further investigation.

Purpose of the Study:

• To investigate dissolved gas-enhanced cavitation under high-intensity ultrasound.
• To analyze the evolution of nanoscale cavitating bubbles.
• To understand the interaction between bubbles and the acoustic field.

Main Methods:

• Theoretical analysis.
• Molecular dynamics simulations.
• Study of dissolved gas effects on bubble formation and evolution.

Main Results:

• Dissolved gas promotes the formation of cavitating bubbles.
• Bubble formation distorts the acoustic field, weakening negative pressure.
• Ultrasonic parameters and gas type influence bubble evolution through gas transfer.
• CO2 and CH4 bubbles exhibit different responses due to liquefaction, solubility, and transfer kinetics.

Conclusions:

• Dissolved gas significantly impacts ultrasound-induced cavitation at the nanoscale.
• Bubble-acoustic field interactions are complex and depend on gas properties.
• Understanding these dynamics is key for optimizing ultrasound applications.