Abstract
This paper deals with the evaluation of radiation properties of air arc plasma with various admixtures of Cu, Ag, and Fe, respectively. Under assumption of isothermal plasma cylinder, the net emission coefficients were calculated for various arc radii as a function of the plasma temperature up to 30000K. For plasma with prescribed temperature profile, the equation of radiation transfer was solved in the P1approximation, and the radiation flux and its divergence were calculated.
Highlights
Thermal plasma is widely used in various technological applications: welding, cutting, spraying, switching processes in relays, commutators or circuit breakers, etc
Under assumption of isothermal plasma cylinder, the net emission coefficients were calculated for various arc radii as a function of the plasma temperature up to 30 000 K
For plasma with prescribed temperature profile, the equation of radiation transfer was solved in the P1 approximation, and the radiation flux and its divergence were calculated
Summary
Thermal plasma is widely used in various technological applications: welding, cutting, spraying, switching processes in relays, commutators or circuit breakers, etc. Process efficiency is defined by different parameters that determine arc operation (temperature, pressure, concentrations of species, size of plasma) and which influence the energy transfer within the medium (conduction, convection, radiation, Joule effect). All these energy exchanges depend on the medium, which is modified by the presence of the arc and by the appearance of new species from contact erosion. The influence of these materials and their erosion are the key factors for a better understanding of the physical phenomena occurred in plasma and effects on the energy transfer process. The choice of mixtures was guided by usual applications (transferred arc, arc welding, plasma spraying of metallic particles)
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