Research Of Droplet Atomization By Ultrasonic Standing Wave Field

Ultrasonic standing wave atomization(USWA)technology is a non-contact,lowcost atomization technology,and has good atomization ability for liquids with high viscosity and high surface tension.USWA is widely used in the preparation of Highperformance metal powder in the fields of Powder Metallurgy Industry,Additive Manufacturing,Metal Powder Injection Molding Technology,Metal Spraying and 3D Welding Technology.The atomization mechanism by ultrasonic standing wave field is the basis for improving the atomization efficiency and powder quality of USWA,the flow field and sound field are important factors of atomization.The paper establish the sound field model and the droplet atomization model which Analyze the deformation and atomization process of droplets in the ultrasonic standing wave sound field,and obtain the atomization mechanism.The following research work is completed:Firstly,establish the ultrasonic standing wave sound field model under double spherical transmitters by mutual coupling between acoustic equation and mechanical equation based on the numerical method of sound field.Clarify the changes of pressure and velocity during the formation and stabilization of the ultrasonic standing wave field.Summarize the effect of phase difference between transmitters on sound pressure,and the degree of disturbance by the droplets.Optimize the parameter design and provide a theoretical basis for the use and design of the USWA equipment.Secondly,construct the mathematical equations of the coupling of the sound field and the two-phase flow based on the nonlinear acoustic theory and the aerodynamic theory,and establish the droplet atomization model by solid mechanics,pressure acoustics,laminar flow,and phase field modules.Summarize the diversification of surrounding flow field and aerodynamics during the deformation of the droplet.Obtain the process of droplet breakup and clarified atomization mechanism.Finally,perform multi-parameter coupling analysis of droplet atomization by ultrasonic standing wave field.Obtain the area and critical conditions of atomization in the resonant cavity.Clarify the influence of the length of the resonant cavity,the diameter and surface tension of droplet on atomization.