This paper aims to disclose the exact effects of various factors on the motion of ultrasonic cavitation bubble. For this purpose, this paper modifies the cavitation bubble dynamics model in light of liquid compressibility, liquid viscosity, water evaporation and vapor condensation. Based on the model, a dynamic equation was created for the bubble, and applied for Matlab simulation of bubble motion. The bubble motion was characterized by such parameters as radius, temperature, pressure, internal energy and the number of vapor molecules. The simulation attempts to reveal how the bubble motion is affected by the initial bubble radius, the ultrasonic frequency and the ultrasonic amplitude. Through the simulation, it is discovered that the change of the initial radius had a little impact on the bubble temperature and bubble pressure. However, the radius variation exerted an obvious influence on the other motion parameters. These parameters shared a similar change pattern. For ultrasonic frequency, the change in frequency had a limited effect on the bubble temperature and bubble pressure, but a significant impact on the other motion parameters. These parameters varied in different ranges. In addition, the ultrasonic amplitude had a rather prominent impact on all motion parameters of the cavitation bubble. The research findings provide important insight into the dynamic features of ultrasonic cavitation under ultrasonic waves.
Ultrasonic Cavitation, Cavitation Bubble, Bubble Radius, Ultrasonic Frequency, Ultrasonic Amplitude
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