Abstract
In this chapter, a finite element simulation analysis on dynamic behaviors of droplets when they impact onto the wall and liquid film is carried out. Firstly, the morphological evolutionary mechanism during spreading of droplets is analyzed based on the dynamic model of droplets impacting onto the wall. Secondly, the impacting dynamics of a single droplet onto the wall under different kinematic viscosities, surface tension coefficients, impact velocities, and contact angles are simulated by controlling variables based on physical parameters and atomization parameters of the lubricating oil under different CA temperatures and air pressures. Moreover, the influencing laws of different factors on droplet spreading coefficient as well as height and radius of the jet flow are analyzed. Finally, dynamic characteristics when a single droplet impacts onto the liquid film are simulated in the same way. The influencing laws of different factors on height and radius of the jet flow as well as thickness of the central liquid film are analyzed.