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Progress in Plasma Processing of Materials, 1997

ISBN 打印: 1-56700-093-2

THERMAL PROPERTIES OF A PLASMA TORCH

Abstract

The plasma jet produced by a D.C. torch using a nozzle with a cylindrical part for the arc and a divergent part for the plasma expansion is studied. A model based essentially on the energy equation is developped to describe the thermal properties of the arc in the cylindrical channel. The energy equation is solved numerically and simultaneously with a calculation of the physical properties as a function of temperature and pressure. First, for the expansion zone, the momentum and energy equations are solved by a finite difference method. This model allows to investigate the behavior of numerical solutions of plasma equations near the wall. Then, a non equilibrium model is developped for the description of expanding plasma and the pressure, velocities, heavy particle and electron temperatures and densities are determined solving momentum, compositions and energy equations.
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