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Investigation of the Anode Boundary Layer of an Atmospheric Pressure Argon Arc

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2 Author(s)
Heberlein, J.V. ; Heat Transfer Division Department of Mechanical Engineering University of Minnesota Minneapolis, Minnesota 55455 ; Pfender, E.

This paper is concerned with the thermodynamic state of the plasma in the anode region of a high intensity arc. Spectrometric studies of the boundary layer in front of a plane anode perpendicular to the axis of a wall-stablized, high-intensity arc in argon atmosphere indicate substantial deviations from LTE. Data taken at distances of 0.5 to 2 mm from the anode surface are evaluated with two different but not entirely independent non-equilibrium data reduction techniques in order to obtain radial distributions of electron temperature and electron density. The electron temperature distribution displays an off-axis peak which increases in magnitude with decreasing distance from the anode. Both electron temperatures and electron densities are considerably higher than the corresponding LTE values.

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Plasma Science, IEEE Transactions on  (Volume:5 ,  Issue: 3 )