Generation and control of acoustic cavitation structure

Area of Science:

• Acoustics
• Fluid Dynamics
• Physical Chemistry

Background:

• Acoustic cavitation structures are crucial for applications like ultrasonic sonochemistry and cleaning.
• Effective generation and control of these structures are essential for process optimization.

Purpose of the Study:

• To investigate the generation and control of typical acoustic cavitation structures.
• To analyze the nuclei source and interrelationships of these structures.
• To understand bubble movement dynamics in ultrasonic fields.

Main Methods:

• Experimental investigation of acoustic cavitation structures.
• Analysis in a 20-50 kHz ultrasonic field.
• Observation of bubble movement and structure formation.

Main Results:

• Identified and characterized typical acoustic cavitation structures (conical bubble, smoker, Lichtenberg figure, etc.).
• Observed cavitation bubbles moving along pressure gradients, forming the basis for complex structures.
• Analyzed the origin of bubble nuclei and the transformation pathways between different structures.

Conclusions:

• The movement of cavitation bubbles along pressure drops is fundamental to the formation of complex acoustic cavitation structures.
• Understanding these structures and their dynamics is vital for advancing ultrasonic applications.
• Further research into controlling these structures can enhance sonochemical and cleaning processes.