Analysis of Film Forming Law and Characteristics for an Air Static Spray with a Variable Position of the Plane

Abstract

In order to accurately establish the film thickness distribution model of a static spraying plane with air gun displacement, the film forming law and characteristics of the static spraying plane with air gun displacement were analyzed. The spray simulation model was established by the Euler–Euler method, and the spray process and film forming condition were calculated. The numerical simulation results show that oblique spraying has a large influence on the near-surface liquid velocity. With the increase in the spray angle, the droplets at the edge of the torch diffuse to the inclined direction, and the uniformity of the coating distribution becomes worse. Spraying height has a large influence on droplet trajectory. The coating thickness decreased significantly with the increase in spraying height, and the coating diffused in the air increased. With the increase in spraying height, the more obvious the droplet diffusion at the edge of the torch, the worse the uniformity quality of the coating. In order to ensure better spraying quality, the spraying height and angle should be controlled within a reasonable range at the same time. Spraying experiments verified the film forming law and characteristics of static spraying with gun displacement.

Numerical simulation and experimental study of dip angle spray film thickness under elliptical double Gaussian sum model

“…The microscopic mechanism of spray film thickness build-up was investigated, 5 and the distribution pattern of film thickness and the causes of film formation were explained at the microscopic level by combining a multi-field coupled flow field theory model with a film thickness distribution model. Zeng et al 6 and Liu 7 conducted a series of spraying experiments with a spray gun under tilted conditions and established a coating thickness distribution model based on the Gaussian sum model with variable tilt angle. The experiments showed that the Gaussian sum model 8 also has high fitting accuracy in describing the coating growth rate for spraying at different inclination angles.…”

Dynamic Numerical Simulation of Curved Surface Coating Trajectory Based on STL Slicing Algorithm

“…Chen et al [16][17][18][19][20] studied the influence of different spraying parameters on film thickness uniformity. Liu et al [21] employed simulation methods to study the flow of gas and coarse powder in the electrostatic process. Chen et al [9] focused on the plane spray process and identified the significant impact of spraying height and angle on film thickness uniformity.…”