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A Critical Analysis of Proposed Plasma Jet Models to Predict Temperature and Velocity Profiles

Published online by Cambridge University Press:  25 February 2011

Daniel Y.C. Wei ,
Bakhtier Farouk  and
Diran Apelian
Daniel Y.C. Wei
Affiliation:
College of Engineering Drexel University, Philadelphia, PA 19104
Bakhtier Farouk
Affiliation:
College of Engineering Drexel University, Philadelphia, PA 19104
Diran Apelian
Affiliation:
College of Engineering Drexel University, Philadelphia, PA 19104
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Abstract

The prediction of temperature and fluid flow associated with a d.c. plasma jet exiting from the nozzle has been an important issue for-some years. Modeling efforts have mainly relied on incompressible flow formulations and various turbulence models to predict the d.c. plasma at atmospheric conditions. The primary assumption of such models is that the plasma is in local thermodynamic equilibrium, steady state, and that no other species from the ambient are entrained. In the subsonic parabolic approach, the plasma is treated as a free jet with no downstream influence on the upstream calculations. The elliptic approach needs conditions to bespecified along all boundaries, and calculations are dependent on the extent of the solutiondomain and the exit boundary conditions.

Very few attempts have been made to model plasma jets which are supersonic upon exiting the nozzle. The problem is important due to the advantages of low pressure plasma deposition but is complex and difficult to analyze. Specifically one has to acount for compressibility and viscous dissipation effects. Off-design operating conditions (over or underexpanded conditions) greatly influence and complicate the plasma temperature and velocity profiles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 98: Symposium K – Plasma Processing and Synthesis of Materials II , 1987 , 41
Copyright
Copyright © Materials Research Society 1987

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References

REFERENCES

1. Apelian, D., Wei, D., and Paliwal, M., 1984, “Particle/Plasma Interactions During Low Pressure Plasma Deposition”, Thin Solid Films, Vol.118, pp. 384–395.Google Scholar
2. Cosner, R.R. and Bower, W.W., 1977, “Patch Solution of the Transonic Flow Fields About an Axisymmetric Boattail”, AIAA Paper 77–227Google Scholar
3. Correa, S.M., 1983, “Transitional Plasma Jet Modeling”, Proceedings, 6th International Symposium on Plasma Chemistry (ed. Boulos, M.I. and Munz, R.J.), Vol.1, pp. 77–81.Google Scholar
4. Dash, S.M., 1985, “Recent Developments in the Modeling of High Speed Jets, Plumes and Wakes”, AIAA–85–1616.Google Scholar
5. Dash, S.M., Weilerstein, G., and Vaglio-Laurin, R., 1975, “Compressibility Effects in Free Turbulent Shear Flow”, AFOSR-SR-75–1435, (Available from DTIC as AD-A016–535).Google Scholar
6. Eggers, J.M., 1966, “Velocity Profiles and Eddy Viscosity Distributions Downstream of a Mach 2.2 Nozzle Exhausting to Quiescent Air”, NASA TN D-3601.Google Scholar
7. El-Kaddah, N., McKelliget, J. and Szekely, J., 1984, “Heat Transfer and Fluid Flow in Plasma Spraying”, Metall. Trans. B, Vol.15, pp. 59–67.Google Scholar
8. Hasen, G.A., 1982, “Navier-Stokes Solution for an Axisymmetric Nozzle”, AIAA Journal Vol.20, No. 9, pp. 1219–1231.Google Scholar
9. Holst, T., 1977, “Numerical Solution of Axisymmetric Boattail Fields with Plume Simulator”, AIAA Paper 77–124Google Scholar
10. Jennions, I.K., Ma, A.S. and Spalding, D.B., 1977, “A Prediction Procedure for 2-D Steady, Supersonic Flows”, Imperial College of Science and Technology, Rept. No. HTS/77/24.Google Scholar
11. Launder, B.E., Morse, A., Spalding, D.B. and Rodi, W., 1972, “Prediction of Free Shear Flows: A Comparison of Six Turbulence Modes”, Free Turbulent Shear Flow, Vol.1, NASA SP-321,Vol. 1, pp. 361–426.Google Scholar
12. McKelliget, J. Szekely, J. Vardelle, M., and Fauchais, P., 1982, “The Temperature and Velocity Fields in a Gas Stream Exiting a Plasma Torch”, Plasma Chemistry and Plasma Processing, Vol.2, pp. 317–326.Google Scholar
13. Mikhail, A.G., 1979, “Numerical Solution of a Supersonic Nozzle Afterbody Flow with Jet Exhaust”, AFFDL-TR-3078.Google Scholar
14. Pergament, H.S., Dash, S.M. and Wilmoth, R.C., 1978, “Predictions of Nearfield Jet Entrainment by an Interactive Mixing/After Burning Model”, AIAA Paper 78–1189,Google Scholar
15. Seiner, J.M. and Norum, T.D., 1980, “Aerodynamic Aspects of Shock Containing Jet Plume”, AIAA Paper 80–0965.Google Scholar
16. Vargaftik, N.B., 1975, “Tables on the Thermophysical Properties of Liquids and Gases”,Hemisphere Corp.Google Scholar
17. Voller, V. and Cross, M., 1979, “Accurate Solution of Moving Boundary Problem Using the Enthalpy Method”, Int. J. Heat and Mass Transfer, Vol.22, pp. 749–756.Google Scholar
18. Wei, D., 1986, “Melting Powder Particle in Plasma Jet”, Ph.D. Thesis, Drexel University, Philadelphia, PA.Google Scholar
19. Wei, D., Farouk, B. and Apelian, D., 1987, “Melting Powder Particles in a Low Pressure Plasma Jet”, Journal of Heat Transfer (in press)Google Scholar