Research Of The Mechanism Of Agglomeration For Oil Mist In Ultrasonic Field

Ultrasonic has a good effect on the entrainment of oil mist particle and can promote the agglomeration. The research of the mechanism of agglomeration has a positive effect on solving the recovery of residual mist and the formation of lubricant film.The paper has researched the mechanism of agglomeration for oil mist in ultrasonic field. Firstly, through analysis the movement of a single oil mist particles in the ultrasonic field, and analysis the particle motion characteristics in ultrasonic field with the Matlab software, I reveal the main reason of particles agglomeration. Then according the theory of acoustic agglomeration, I build the theory of the oil mist agglomeration in the ultrasonic field, and the acoustic agglomeration simulation is established based on the orthokinetic and hydrodynamic interaction as main mechanisms. The ultrasonic intensity, ultrasonic frequency, and particle size distribution which have an effect on the agglomeration frequency is analyzed through numerical simulation. Associate with the application situation, the oil mist particles are established physical model and simulated.According to the numerical analysis, the agglomeration of oil mist particles is mainly caused by the ultrasonic entrainment, and the higher the ultrasonic frequency, the lower the entrainment is. The smaller the particle size, the better the effect of the entrainment is. When the entrained particle diameter is smaller than 2μm, the entrainment effect is very obvious. The orthokinetic interaction is agreed with the SPL, and disagreed with the frequency. When the particle size is very different from each other, the orthokinetic effect is obvious. When particle size is same, the orthokinetic is useless. The hydrodynamic interaction is agreed with the frequency and SPL. When the particle size is same, the agglomeration with hydrodynamic interaction is obvious. According to the result of simulation, high temperature and low pressure is beneficial to the agglomeration. As the temperature rises, the agglomeration becomes better. As the pressure increases, the agglomeration becomes worse. The higher frequency isn’t conducive to the agglomeration, and the best frequency is 20 KHz.