Hostname: page-component-7479d7b7d-767nl Total loading time: 0 Render date: 2024-07-09T00:35:53.581Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Muehlberger, E.: in “Proceedings of the 7th International Thermal Spray Conference”, (Welding Institute, Abington, Cambridge, U.K., 1974), p. 245.Google Scholar
2. Jackson, M.R., Rairden, J.R., Smith, J.S. and Smith, R.W.: J. of Metals, 33(11), 23 (1981).Google Scholar
3. Shanker, S., Koenig, D.E. and Dardi, L.E.: J. of Metals, 33(10), 13 (1981).Google Scholar
4. Wei, D., Correa, S.M., Apelian, D. and Paliwal, M.: “6th International Symposium on Plasma Chemistry”, Vol. 1, Montreal, Canada (1983), p. 83.Google Scholar
5. Correa, S.M.: “6th International Symposium on Plasma Chemistry”, Vol. 1, Montreal, Canada (1983), p. 77.Google Scholar
6. Schaaf, S.A. and Chambre, P.L.: in “Fundamentals of Gas Dynamics”, (Emmons, H.W., ed.), High Speed Aerodynamics and Jet Propulsion, Vol. 3, (Princeton University Press, Princeton, New Jersey, 1958), p. 587.Google Scholar
7. Devienne, M.: “Frottement et échanges thermiques dans las gaz raréfiés”, Gauthier-Villars, Paris, 1958.Google Scholar
8. Vallerani, E.: “A Review of Supersonic Sphere Drag from the Continuum to the Free Molecular Flow Regime”, AGARD Conference Proceedings No. 124, on Aerodynamic Drag.Google Scholar
9. Phillips, W.F.; Physics Fluids 18, 1089 (1975).Google Scholar
10. Johnson, H.A. and Rubesin, M.W.: Trans. A.S.M.E., 71(5), 447 (July 1949).Google Scholar
11. Drake, R.M. Jr. and Backer, G.H.: Trans. A.S.M.E. 74(7), 1241(Oct. 1952).Google Scholar
12. Springer, G.S.: Heat Transfer in Rarefied Gas, in “Advances in Heat Transfer”, Vol. 7, Hartnett, J.P. and Irvine, T., eds. (Academic Press, New York 1971), pp. 163–218.Google Scholar
13. Kavanau, L.L.: Trans. A.S.M.E., 77(5), 617 (July 1955).Google Scholar
14. Sherman, F.S.: in “Rarefied Gas Dynamics”, Laurmann, J.A., ed., Vol. 2,(Academic Press, Inc., New York, 1983), p. 228.Google Scholar
15. Oppenheim, A.K.: J. Aeronaut Sci. 20(1), 49 (1953).Google Scholar
16. Ranz, W.E. and Marshall, W.R. Jr.: Chem. Eng. Progress, 48, 173 (1952).Google Scholar
17. Yoshida, T. and Akashi, K.: J. Appl. Phys., 48, 2252 (1977).Google Scholar
18. Fiszdon, J.K.: Int. J. Heat and Mass Transfer, 22, 749 (1979).Google Scholar
19. Voller, V. and Cross, M.: Int. J. Heat and Mass Transfer, 24, 545 (1981).Google Scholar
20. Frind, G., Goody, C.P. and Prescott, L.E.: “6th International Symposium on Plasma Chemistry”, Vol. 1, Montreal, Canada (1983), p. 120.Google Scholar
21. Apelian, D. and Paliwal, M.: “Material Research Society 1983 Annual Meeting (November 14–17, 1983).Google Scholar