Abstract
In order to meet the visualization requirements of the cavitation field distribution in the ultrasonic cavitation reactor, a method based on the numerical simulation of the amplitude of sound pressure is proposed. In order to verify that the amplitude of sound pressure plays a decisive role in cavitation effect, the dynamic equation of a single cavitation bubble is established, and the influence law of the amplitude of sound pressure on cavitation motion is analyzed in principle; then, the three-dimensional model of the self-built drum type ultrasonic cavitation reactor is built using the finite element software COMSOL Multiphysics, and the amplitude distribution of the sound pressure at the longitudinal section is obtained when the liquid height was 25 mm, 60 mm and 90 mm. Through the comparison of aluminum foil corrosion experiments, it shows that the numerical simulation method based on the amplitude of sound pressure can accurately characterize the distribution area of ultrasonic cavitation field, which overcomes the disadvantage of time-consuming and labor-consuming in the traditional measurement method of cavitation field distribution, and lays a foundation for the study of the distribution law of ultrasonic cavitation field.
Highlights
Cavitation is essentially a series of processes in which the bubble core in a liquid expands, compresses and collapses under the alternate periodic fluctuation of ultrasonic wave
The dynamic equation of a single cavitation bubble is derived by analysing its motion process; the acoustic-piezoelectric-electric coupling model is established by the finite element software COMSOL Multiphysics, which has the advantage of multi physical field coupling; the amplitude distribution of sound pressure at different liquid level is compared with the experimental results of cavitation corrosion of aluminum foil
Comparing the simulation results of sound pressure amplitude with aluminum foil corrosion experiment, it can be found that the area with higher amplitude of sound pressure is the cavitation corrosion area of aluminum foil, while the area with lower amplitude of sound pressure is basically free of cavitation corrosion
Summary
Cavitation is essentially a series of processes in which the bubble core in a liquid expands, compresses and collapses under the alternate periodic fluctuation of ultrasonic wave. The hydrophone method is helpful for the quantitative study of ultrasonic cavitation field, the cost of hydrophone is relatively high and it interferes with the experimental conditions.In recent years, people tried to use computer technology such as computational fluid dynamics, finite element method, time-domain finite difference method and other methods to calculate and simulate the sound field [7,8]. The dynamic equation of a single cavitation bubble is derived by analysing its motion process; the acoustic-piezoelectric-electric coupling model is established by the finite element software COMSOL Multiphysics, which has the advantage of multi physical field coupling; the amplitude distribution of sound pressure at different liquid level is compared with the experimental results of cavitation corrosion of aluminum foil
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