Study on Oscillation Modes of Cavitation Bubbles Under Dual-Frequency Ultrasonic Excitation
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Abstract
Ultrasonic excitation induces two distinct modes of cavitation bubble oscillation, i.e., periodic and chaotic. This study extends computational analysis by generalizing the secondary ultrasonic excitation frequency from discrete values to a continuous parameter space, corroborating our prior observations regarding chaotic oscillation control in dual-frequency cavitation bubbles. We also explore how bubble oscillation patterns respond to ultrasonic excitation parameters, as well as the changes in oscillation intensity induced by the secondary ultrasonic excitation. The results show that adjusting secondary ultrasonic pressure or frequency parameters can trigger transitions among different bubble oscillation states, further supplementing the parametric characteristics under continuous wide-frequency variation. Notably, within the investigated parameter range, varying the secondary frequency results in a clear alternation between periodic and chaotic bubble oscillation states. In addition, we find that when maintaining constant total pressure amplitude and cavitation bubble oscillation mode, the intensity of bubble oscillations varies distinctly with changes in secondary ultrasonic pressure or frequency.
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