声场中PM_(2.5)颗粒碰撞运动模型

Particles collision model of PM_(2.5) in sound field

建立了声场中PM2.5颗粒碰撞运动模型。模拟结果表明,颗粒碰撞前速度与水平面的夹角θ是影响颗粒运动轨迹的一个重要因素,它的改变将决定颗粒在声场中是否碰撞、碰撞的位置以及碰撞后颗粒如何运动;颗粒碰撞前的速度大小将决定颗粒碰撞后是沿声波方向运动还是逆声波方向运动或是停留在原地振动;声场频率的不同改变了颗粒在发生碰撞时的运动趋势及颗粒的在碰撞时的运动趋势,同时,声场频率的改变将影响碰撞后颗粒的振幅;声场声强的改变不但影响了颗粒运动的振幅,而且影响了颗粒碰撞后运动趋势。

A model that describes the collision of PM2.5 driven by level sound wave in gravitational field was sug- gested. The angle θ of speed of particle and horizontal is one of important factors that affect the movement of PM2.5, and its change will determine whether the collision will happen, the position of collision and how the particles will move after collision. The speed of particles before collision will determine whether particles will move along the direction of sound waves, against direction of the sound waves or will vibrate in their original position. The different frequency of sound field will change the tendency of movement of particles when collision happens, and, it also will change the swing. The change of intensity of sound field influences the swing of PM2.5 and the movement tendency of particles after collision.