Numerical investigation of micro-pore formation during substrate impact of molten droplets in spraying processes
- Univ. of California, Irvine, CA (United States)
- Electro Plasma, Inc., Irvine, CA (United States)
The porosity that is commonly associated with discrete droplet processes, such as plasma spraying and spray deposition, effectively degrades the quality of the sprayed material. In the present study, micro-pore formation during the deformation and interaction of molten tungsten droplets impinging onto a flat substrate in spraying processes is numerically investigated. The numerical simulation is accomplished on the basis of the full Navier-Stokes equations and the Volume Of Fluid (VOF) function by using a 2-domain method for the thermal field and solidification problem and a two-phase flow continuum model for the flow problem with a growing solid layer. The possible mechanisms governing the formation of micro-pores are discussed. The effects of important processing parameters, such as droplet impact velocity, droplet temperature, substrate temperature, and droplet viscosity, on the micro-pore formation are addressed.
- OSTI ID:
- 160475
- Report Number(s):
- CONF-940684-; ISBN 0-87170-509-5; TRN: 96:006030
- Resource Relation:
- Conference: 1994 national thermal spray conference, Boston, MA (United States), 20-24 Jun 1994; Other Information: PBD: 1994; Related Information: Is Part Of 1994 Thermal spray industrial applications: Proceedings; Berndt, C.C.; Sampath, S. [eds.] [State Univ. of New York, Stony Brook, NY (United States). Dept. of Materials Science and Engineering]; PB: 816 p.
- Country of Publication:
- United States
- Language:
- English
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