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Melting of Powder Particles in a Low Pressure Plasma Jet

Published online by Cambridge University Press:  15 February 2011

D. Wei ,
D. Apelian ,
S. M. Correa  and
M. Paliwal
D. Wei
Affiliation:
Department of Materials Engineering, Drexel University,Philadelphia, PA 19104
D. Apelian
Affiliation:
Department of Materials Engineering, Drexel University,Philadelphia, PA 19104
S. M. Correa
Affiliation:
General Electric Company, Corporate Research & Development, Schenectady, NY 12345
M. Paliwal
Affiliation:
Department of Materials Engineering, Drexel University,Philadelphia, PA 19104
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Abstract

A numerical model has been developed to predict the temperature profile of particles injected in a D.C. plasma jet. The equations governing particle melting were applied to spherical powders of binary model alloys. Thermophysical properties of the gas and the powder material have been taken to be temperature dependent. In the proposed model, the latent heat of melting was taken into account by introducing apparent enthalpy as a function of the fraction of liquid formed which can be derived from equations describing non-equilibrium melting. The temperature and velocity profiles of the plasma jet used in this analysis are for a free jet (without target interference) and were calculated using the parabolic Navier-Stokes equation with a K-E turbulence model. Correction factors have been introduced to take into account non-continuum effects encountered in the low pressure environment and the results show that both heat and momentum transfer between the plasma gas and the injected particles are reduced.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 30: Symposium L – Plasma Processing and Synthesis of Materials I , 1983 , 197
Copyright
Copyright © Materials Research Society 1984

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References

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