Abstract
Abstract : The paper discusses the results of an experimental study of a potassium seeded-argon atmospheric pressure Faraday accelerator. Electrical conductivity, with and without applied magnetic field, temperature of the electrodes, and potential distributions across the channel were measured. The channel was approximately 1 cm x 1 cm x 10 cm long and consisted of continuous Ta electrodes and BN sidewalls. The potential distributions across the channel, measured by means of Ta wires embedded in the sidewalls, show very large wall sheaths. Since the electrode temperatures are sufficiently high to give good thermionic emission, these large sheath voltage drops indicate the presence of thick boundary layers of low electrical conductivity. In the presence of a transverse magnetic field the measurements show that the boundary layers become thinner, as predicted by theory. The values of conductivity measured across the central core of the flow are compared with predictions of Kerrebrock's two-temperature theory, and the agreement between the measured and calculated values is good. These are probably the first conductivity measurements to be reported on an atmospheric pressure, supersonic gas flow with applied magnetic field. (Author)
Published Version
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