Electrical Conductivity and Temperature Distribution of Arc Plasma in Narrow Insulating Channels

Having examined electrical conductivity and temperature distribution of a cross-section of an arc plasma column burning in the narrow channel between insulating walls. It was shown that arc pressure created by intrinsic magnetic field has little effect at subsonic velocity. In contrast with an open arc with convective cooling, mean electrical conductivity of an arc in a narrow channel is significantly dependent on the current passing through it.     

On Current Distribution through the Cross-Section of an Arc Moving in a Narrow Insulating Slot

Current distribution across the arc plasma cross-section constructed in a narrow slot between isolating walls and other factors affecting the distribution are considered. Experimental data on current density distribution of the arc moving at subsonic velocity are analyzed. Data available on the mean current density in an arc moving at supersonic velocity and under phase transition conditions on an active surface of the walls (gas-gen erating) are summarized. Possible influence of conditions of heat transfer with walls and pressure inside the column on the extent of non-uniformity of current distribution on the arc cross-section are shown. The problems under consideration are of practical application for avoiding thermal overload of arc chambers of magnetic-blast breakers.