IN-FLIGHT BEHAVIOUR OF DENSE AND HOLLOW PARTICLES DURING PLASMA SPRAYING: PART I A NUMERICAL MODEL
T. Klocker, T.W. Clyne
J. Ther. Spray Tech.
abstract:A numerical finite difference model is presented for simulation of heat and momentum transfer between gas stream and particle during plasma spraying. The model has been applied to spraying of both dense and hollow spherical particles, and also both to single particles and to populations of particle size. Predictions are presented for spraying of zirconia, relating to in-flight thermal histories and trajectories. Deductions are made concerning particle melting, resolidification, vaporisation and deposition efficiencies. It is shown that certain practical benefits, for example in improved deposition efficiencies, can be obtained by using hollow particles instead of dense ones. Some experimental validation of the model is included, but more systematic comparisons with experimental data are presented in Part II of this pair of papers.
keywords:Oxidation; trajectories; concerning; thermal histories; stream; predicted particle; particle velocities; non-continuum effects; thermal boundary layer
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