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研究了超声辐照下液体中声压场分布,模拟了流场分布的特性,模拟结果与利用粒子成像测速仪得到的实验结果相符。进一步研究了声学参数及容器几何环境对流场分布的影响。研究发现,增大超声功率和频率可使流场速度变大:在30~60 W范围内,超声功率与流场中最大流速间存在线性关系;在频率为100~472 kHz范围内,流场速度大小随频率的升高而增加;在层流区,流速与频率的平方成正比;在湍流区,流速与频率的1/2次方成正比。进一步研究发现,随着换能器到容器壁间距离的增加,流场速度减小。
The distribution of acoustic pressure field in liquid under ultrasonic irradiation was studied, and the characteristics of flow field distribution were simulated. The simulation results were in good agreement with the experimental results obtained by particle imager. The influence of acoustic parameters and container geometry on the flow field distribution is further studied. The results show that increasing the ultrasonic power and frequency can increase the velocity of flow field: there is a linear relationship between the ultrasonic power and the maximum velocity in the flow field in the range of 30-60 W; in the frequency range of 100-472 kHz, the flow field The velocity increases with increasing frequency; in the laminar flow region, the velocity is proportional to the square of the frequency; in the turbulent region, the velocity is proportional to the frequency 1/2 of the frequency. Further study found that as the distance between the transducer and the container wall increases, the velocity of the flow field decreases.