High Temperature Material Processes (An International Quarterly of High-Technology Plasma Processes) An International Journal

ISSN for PRINT: 1093-3611

For Online Access

Best Paper Award Selection - Editorial Board Site

2000, Volume4

Issue 1

156 pages

Issue price - $144.00

B. Jodoin
Department of mechanical engineering, University of Ottawa, (Ontario) KIN 6N5; and Plasma Technology Research Centre (CRTP), Department of Chemical Engineering Universite de Sherbrooke, Sherbrooke (Qc) CANADA J1K 2R1

P. Proulx
Plasma Technology Research Centre (CRTP), Department of Chemical Engineering , Faculte de genie, Universite de Sherbrooke, Sherbrooke (Qc) CANADA J1K 2R1

The effects of current intensity and hydrogen on argon supersonic plasma flow inside a d.c. torch are investigated in order to gain insight of the flow structure and transfer mechanisms inside the torch. A two-dimensional axisymmetric model and a non-equilibrium cathode sheath model are used for this purpose. The model is validated by comparison with published experiments and good agreement is found between the model and the measurements. The study describes the aerodynamic, thermal and electrical fields inside the nozzle. It reveals that the presence of hydrogen changes considerably the plasma features. The study of the current intensity influence gives the trend and values of the operating conditions for the optimal use of the system for spraying applications. This study shows that the effect of the current intensity on the flow is different from the subsonic cases. It also indicates that a maximum current exists, beyond which the flow at the exit is not completely supersonic.

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