A Review of the Developments of the Characteristics and Mechanisms of Airless Spraying on Complex Surfaces

Abstract

The special surface appearance of complex surfaces restricts the coating film quality of spraying. The study of the atomization and film formation characteristics of typical complex surfaces, as well as the spraying mechanism, is essential for planning the spraying robotic trajectory and improving the spraying efficiency. In this paper, modeling and characteristics of the atomization and film formation process, based on CFD numerical simulations in previous studies, are systematically reviewed, focusing especially on airless spraying. In addition, the advantages and disadvantages of the existing research from the perspective of numerical models and methods are discussed. Finally, a further research direction for spraying on complex surface is prospected. Overall, a comprehensive and up-to-date review of spray atomization and film formation characteristics is considered valuable to practitioners and researchers in these fields, and will facilitate the further application of robotic spraying in the mechanical, automotive, marine, aerospace, petrochemical and other industries.

A CFD-DEM Simulation of Droplets in an Airless Spray Coating Process of a Square Duct

“…The simulated characteristics and coating film of the spray flow field were compared to experimental measurements. Wu et al [21] provided a comprehensive review of CFD simulations of atomization characteristics and film formation mechanisms using Euler-Lagrange and Euler-Euler methods in air and airless spraying processes. As mentioned above, the interactions of droplet-droplet and wall-droplet collisions did not account for simulations of droplet deposition of the walls during coating processes.…”