Electrical properties of argon gas emerging from a plasma jet
Martinez, Eugene Paul
Beckmann, Herbert K.
Master of Science
Argon gas, which had been partly ionized by an electric arc with an enthalpy input in the order of 104 BTU/lbm was expanded through a supersonic wind tunnel nozzle. It was found to contain residual positive ions in excess of electrons. These residual ions amounted to 10 to the -4 times the total number of flowing atoms; a slight increase occurred with decreasing enthalpy input. This quantity also represented the only residual ions of the gas jet leaving the expansion nozzle at ambient temperature and a pressure of 0.25 mm Hg. Normalization of these ions was achieved by means of diffusion to the surface of the pipe recapturing the free jet.