Abstract: In order to evaluate the influence of ultrasonic cavitation on mixing, based on the method of UFD (User Defined Function), the flow field in the mixer（KSM）was numerical simulated by using FLUENT software and verified by experiment. The results showed that the fluid in the KSM mixed faster and more uniform due to the ultrasonic cavitation. The pressure drop of the mixer increased slightly. The flow rate of the fluid increased from 0.50 m/s to 0.55 m/s at the inlet of the mixer and it increased by 10%. The turbulence intensity of the fluid was enhanced, and the strengthening effect was most significant at the first mixing element. And more important, the strengthening effect was most significant for the first element which is basically stable after second mixing elements. The result of experiment also is basically consistent with the simulation results. The fluid mixed more uniform and the mixing was better. With the addition of ultrasonic cavitation, the mixing of the fluid in the static mixer was more uniform and the mixing effect was better.

Key words: Static mixer, Numerical simulation, Turbulence intensity, Ultrasonic cavitation, Mixing

摘要： 以SK型静态混合器为研究对象，通过UFD（用户自定义函数）方法，运用FLUENT软件对混合器内流场进行数值模拟，研究超声空化对混合器混合效果的影响并进行实验验证。结果表明，在超声空化作用下，流体混合地更快、更均匀，混合器的压降稍有增大；在混合器进口处，流体的流速由0.50 m/s提高到0.55 m/s，流速提高了10%；流体的湍流强度增强，强化作用在第一个混合元件处最为显著，经过第二个混合元件后基本达到稳定。实验中加入超声波与模拟结果基本吻合，超声空化的加入使静态混合器中的流体混合更为均匀，混合效果更好。

关键词: 静态混合器, 数值模拟, 湍流强度, 超声空化, 混合