Abstract
A multifluid model of a wall-stabilised AC arc in argon is developed. Differing electron/heavy particle temperatures are allowed for as well as deviations from Saha equilibrium resulting from ambipolar flow to the wall and time dependence. Formulae enabling rapid computer evaluation of the transport properties of the partially ionised argon plasma are also described. Results show that nonequilibrium effects are important near current zero. Comparison with experimental data shows that the model fails to predict observed extinction and reignition voltage peaks. A possible explanation lies in the presence of molecular impurities in the argon.
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