Abstract
Deviations from chemical equilibrium in argon arc plasma are analysed by means of collisional-radiative model. Corresponding comprehensive kinetic scheme has been developed and applied form study of free-burning arc at the conditions typical for welding applications. While the natural lifetime have been used for radiation emitted from highly excited argon states, the resonance radiation was described taking into account the radiation transport effects. Resulting spatial distributions of excited argon atoms are compared for the cases of LTE and two-temperature plasma using different approaches for the description of the resonance radiation transport.
Highlights
Modern arc simulations take into account the deviations from equilibrium plasma state in order to reach a better agreement with experiments
Deviations from chemical equilibrium in argon arc plasma are analysed by means of collisional-radiative model
While the natural lifetime has been used for radiation emitted from highly excited argon states the resonance radiation was described taking into account the radiation transport effects
Summary
Modern arc simulations take into account the deviations from equilibrium plasma state in order to reach a better agreement with experiments. Transport of resonance radiation is a notable process, which influences the formation of various spatially-temporal structures in the gasdischarge plasma. This type of the plasma transport competes with other transport mechanisms, such as diffusion and convection. The model includes both the axial and radial dependency for the conditions typical for tungsten inert gas welding (TIG) Input parameters, such as gas and electron temperature profiles, electron density are predicted by a full non-equilibrium MHD model of TIG arc. The contributions of collisional processes, radiative processes as well as of radiation transport for these regions are analysed with focus on deviations from equilibrium state
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