Location of Repository

Numerical modelling of sequential droplet impingements

By S. Kamnis, Sai Gu, T.J. Lu and C. Chen

Abstract

During the process of thermal spray coating, molten powders are sprayed and deposited on substrates to generate protective coatings. It is essential to have a clear understanding of the physics of droplet impingement on the surface of substrates for better control of the generation of splats and the structure of coating. A numerical model is developed in this paper to simulate the dynamics of transient flow during the impingement process, including spreading, break-up, air entrapment and solidification. The computation is achieved using the technique of volume of fluid surface tracking within a fixed Eulerian structured mesh. The three-dimensional simulation is able to accurately give a demonstration of dynamic flow patterns such as the generation of fingers, satellite droplets and pores during impingement. The numerical model is validated with experimental data from the tin droplet measurement and excellent agreement is found between the simulation and the experiment.<br/><br/

Year: 2008
OAI identifier: oai:eprints.soton.ac.uk:149241
Provided by: e-Prints Soton

Suggested articles

Preview

Citations

  1. (1994). A porosity formation and flattening model of an impinging molten particle in thermal spray coatings doi
  2. (1989). A review of microstructure and properties of plasma sprayed ceramic coatings Surf. doi
  3. (2003). A stochastic model to simulate formation of a thermal spray coating doi
  4. (1990). Analysis of pressure–velocity coupling on non-orthogonal grids Numer.
  5. (1991). Computer simulation of plasma-sprayed coatings: I. Coating deposition model doi
  6. (1991). Computer simulation of plasma-sprayed coatings: II. Effective bulk properties and thermal stress calculations Surf. doi
  7. (2003). Interactions between molten metal droplets impinging on a solid surface doi
  8. (1977). Microstructural investigation of plasma sprayed aluminum coatings doi
  9. (1997). Modeling of porosity during spray forming doi
  10. (2005). Numerical modelling of droplet impingement J.Phys. doi
  11. (1979). Numerical solution of problems in compressible fluid flow: treatment of the velocity–pressure coupling Numer. doi
  12. (1995). Order of accuracy of QUICK and related convection–diffusion schemes doi
  13. (1995). Remelting phenomena in the process of splat solidification doi
  14. (1994). Solidification of liquid metal droplets impacting sequentially on a solid surface doi
  15. (2002). Splashing of molten tin droplets on a rough steel surface doi
  16. (1998). Surface roughness of thermal spray coatings made with off-normal spray angles doi
  17. (1987). The segregated approach to predicting viscous compressible fluid flows doi

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.