Abstract
In a capillary electrolyte cathode atmospheric glow discharge (ELCAD) plasma, the current density and the length of the cathode dark space (LCDS) were measured and the gas temperature (Tg) in the cathode surface-dark space boundary layer was estimated. Using a CCD camera, the current density (the diameter of the cathode spot) and the LCDS were determined from the light intensity distribution provided by the FITSVIEW image processing software. The current density was significantly higher compared with that measured in a normal ELCAD glow and increased with increasing current. The LCDS was also estimated by means of the similarity law relating to the ELCAD plasma. The estimated and measured values of the LCDS are in good agreement and smaller than that observed in a normal ELCAD. In the boundary layer a higher Tg was estimated because of the increased current density.
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