This paper is based on the governing equation of fluid dynamics and VOF model, simulating the motion of ultrasonic cavitation bubble in Fluent 14.5 software environment. Firstly, we simulated the change of morphological single cavitation bubble with a cycle, and the calculations of maximum area, minimum area, expansion time and contraction time were used to analyze the effect of ultrasound parameters on cavitation. Besides, we explored the effect of dual frequency ultrasound on cavitation bubble motion. Under the situation of other conditions being equal, the numerical results indicate that the cavitation effect is best when the sound pressure amplitude is 3 MPa within the range of 1～5 MPa, and when ultrasonic frequency is greater than 20 kHz, the cavitation effect decreases with the increase of ultrasonic frequency. The results also show that the cavitation effect of dual frequency ultrasound with the same frequency is better than single frequency ultrasound whose sound pressure amplitude is twice as much as dual frequency ultrasound, and the cavitation effect of dual frequency ultrasound with the different frequencies is affected by the frequency difference.%该文基于流体动力学控制方程和VOF模型,在Fluent 14.5软件环境下对超声空化泡进行数值模拟.首先研究了超声空化泡一个周期内的形态变化,并且利用空化泡形态变化的最大面积、最小面积、膨胀时间、收缩时间等数值结果分析超声参数对空化效果的影响.同时探究了双频超声作用下空化泡运动的变化,计算结果表明:在其他条件相同的情况下,在1～5 MPa范围内,超声声压幅值为3 MPa时空化效果最好;当超声频率大于20 kHz时,空化效果随着超声频率的增大而降低.对于频率相同的双频超声,较声压幅值为其两倍的单频超声有更好的空化效果;对于频率不同的双频超声,空化效果受到频率差的影响.
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