Dynamic Behavior of Ultrasonic Cavitation Bubble in Silver Melt
The behavior of a single cavitation bubble under different ultrasonic conditions was investigated by numeri-cal simulation.The results indicate that the ultrasonic amplitude has a significant effect on the movement of cavitation bubbles.When the ultrasonic amplitude is below 101 kPa,the movement of the bubble follows a sinusoidal pattern with minor size variation.With the increase of ultrasonic amplitude,the movement of cavitation bubbles is converted to transient cavitation.During the transient cavitation process,lower ultrasonic frequency,ambient pressure and smaller initial radius of cavitation bubble can enhance the cavitation effect.When the ultrasonic amplitude reaches 1414 kPa,the bubble size becomes large and difficult to be compressed and collapsed,thus prolonging the existence time in the melt and further facilitating the gas extraction process.
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