The spray atomization process of the atomizing nozzle l […]
The spray atomization process of the atomizing nozzle liquid is usually divided into three stages:
One is the high-speed flow of liquid inside the atomizing nozzle;
The second is the stage in which the liquid is split from the liquid column into droplets after being ejected from the atomizing nozzle;
The third is the stage in which the atomizing nozzle droplets are further broken in the gas.
The atomization mechanism of the pressure atomizing nozzle is to discharge the liquid flowing in the nozzle through the small hole at a high speed under the action of pressure, thereby realizing the conversion of the liquid pressure potential energy to the kinetic energy, thereby obtaining a higher relative to the surrounding gas. Flow rate, the atomization of the liquid is achieved by intense shearing between the gas and the liquid in the environment. The atomization process of the atomizing nozzle liquid is actually a process in which the pressure of the liquid competes with the surface tension and viscosity of the liquid, and the surface tension of the liquid attempts to keep the liquid spherical (in which case the surface energy of the droplet is minimized),
The viscosity of the liquid hinders the deformation of the liquid, and when the external force acts enough to overcome the surface tension and the viscosity of the liquid, the liquid breaks into many droplets. This is a primary rupture, and the primary rupture of a continuous liquid creates many droplets of relatively large diameter, but the process is unstable. If a further rupture occurs, a larger amount of fine droplets will be formed. Therefore, the final droplet size formed by atomization will depend not only on the size of the large particle droplets formed by the primary atomization, but also on the rupture of the secondary atomization