Model and Powder Particle Heating, Melting, Resolidification, and Evaporation in Plasma Spraying Processes
Author:
Wan Y. P.1, Prasad V.1, Wang G.-X.1, Sampath S.1, Fincke J. R.2
Affiliation:
1. Center for Thermal Spray Research, and Process Modeling Laboratory, State University of New York at Stony Brook, Stony Brook, NY 11794-2275 2. Idaho National Engineering and Environmental Laboratory, ID 83415-2211
Abstract
A comprehensive model is developed to study the heating, melting, evaporation, and resolidification of powder particles in plasma flames. The well-established LAVA code for plasma flame simulation is used to predict the plasma gas field under given power conditions, and provide inputs to the particle model. The particle is assumed to be a spherical and one-dimensional heat conduction equation with phase change within the particle is solved numerically using an appropriate coordinate transformation and finite difference method. Melting, vaporization, and resolidification interfaces are tracked and the particle vaporization is accounted for by the mass diffusion of vapor through the boundary layer around the particle. The effect of mass transfer on convective heat transfer is also included. Calculations have been carried out for a single particle injected into an Ar–H2 plasma jet. Zirconia and nickel are selected as solid particles because of their widespread industrial applications as well as significant differences in their thermal properties. Numerical results show strong nonisothermal effect of heating, especially for materials with low thermal conductivity, such as zirconia. The model also predicts strong evaporation of the material at high temperatures.
Publisher
ASME International
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
Reference34 articles.
1. Anselmo, A., Prasad, V., and Koziol, J., 1991, “Melting of a Sphere when Dropped in a Pool of Melt with Applications to Partially-Immersed Silicon Pellets,” 27th National Heat Transfer Conf., Minneapolis. 2. Boulos, M. I., Fauchais, P., Vardelle, A., and Pfender, E., 1993, “Fundamentals of Plasma Particle Momentum and Heat Transfer,” Plasma Spraying, R. Suryanarayanan, ed., World Scientific, Singapore, pp. 3–57. 3. Boulos, M. I., Fauchais, P., and Pfender, E., 1994, Thermal Plasmas, Fundamentals and Applications, Vol. 1, Plenum Press, New York, p. 367, 372. 4. Chang C. H. , and RamshawJ. D., 1993, “Numerical Simulations of Argon Plasma Jets Flowing into Cold Air,” Plasma Chemistry and Plasma Processing, Vol. 13, No. 2, pp. 189–209. 5. Chang C. H. , and RamshawJ. D., 1996, “Modeling of nonequilibrium effects in a High-Velocity Nitrogen-Hydrogen Plasma Jet,” Plasma Chemistry and Plasma Processing (Supplement), Vol. 16, No. 1, pp. 5S–17S5S–17S.
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