Modeling And Measurements Of The Demixing Effect In Arc Plasmas Containing Hydrogen

In this work are presented the results of the measurements of the plasma parameters in the wall-stabilized arc working in several mixtures of argon, hydrogen and sometimes helium, showing the lateral and longitudinal demixing effect. Lateral demixing in Ar+H2 is compared with the theoretical calculations of the plasma temperatures and molar ratios for Ar+H2 mixture, and its agreement with even the very simplified model of diffusion in arc plasma. The experiment shows the considerable lateral variations in the hydrogen percentage in the plasmas containing helium and, as well, the visible variations in electron density in such case