Abstract
In order to provide some insight into the complex fluid behavior involved in ultrasonic vibration-assisted abrasive waterjet machining, a three-dimensional CFD model is established to investigate the cavitating characteristics. Governing equations of the impacting jet flow field are solved accompanied with the mass transfer equation which is based on Schnerr-Sauer cavitation model. Vibrating motion of the target surface is performed through adopting a moving wall boundary with dynamic mesh method. The evolution of cavitating bubbles and fluid pressure at the impact zone is analyzed. The results imply that the variation of vapor phase fraction has a close correspondence with the pressure fluctuation. Moreover, an increase of vibration amplitude can effectively enhance on the intensity of cavitation. The maximum volume fraction is increased by 78% with a 20 μm increase of amplitude. The experimental results indicate that irregular craters induced by cavitation are formed on the eroded surface when applying ultrasonic vibration to the workpiece.
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