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ThemeT HIS paper presents the results of a theoretical investigation of thermochemical nonequilibrium in an argon arc plasma. A multifluid model is used to describe the nonequilibrium plasma, and the resulting numerical solutions are compared with both existing experimental data and equilibrium solutions. In addition, a parametric study is performed to determine the spatial extent of the nonequilibrium condition as a function of arc operating variables, and the effects of collision-cross-section and wall-temperature uncertainties on the predictions are ascertained.

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