Advantageous properties of the glide arc plasma can be used for various applications. Typical discharge parameters are mentioned in.
After the quenching of one discharge at maximum elongation a new discharge appears at minimal electrode distance and the whole evolution is repeated. The maximum length of the glide arc channel is related to the supplied voltage. The non-equilibrium stage begins when the length of the plasma column exceeds its critical value and heat losses from the plasma begin to ex- ceed the energy supplied by source. The discharge also consecutively changes its properties from the ones nearly identical to a standard arc discharge at short channel lengths to a non-equilibrium plasma at longer channels. So for low gas flow and low buoyancy, the discharge will be stationary and situated near the shortest path between the electrodes and only for high gas flow and/or high buoyancy force it will act as a glide arc.
However, due to the microscopic sur- face irregularities affecting local electric field the situa- tion is more complex and the force needed to move the discharge can be substantially higher. The effect of arc gliding therefore needs that the external force overcomes the movement reluctance of the discharge, which is apparently dependent on the angle between the slanted electrodes. However, the discharge has certain resistance or reluctance to be moved out of this optimal position due to the minimum energy principle (the power needed to sustain the discharge increases with discharge length ). When external forces (buoyancy, gas flow) act on the plasma channel, it is pushed from this optimal position. Without buoyancy or external gas flow, the arc would stay in this place in- definitely. along the shortest path between the electrodes. The most probable place for arc ignition is the site of the strongest electric field, i.e. The sliding or gliding arc (glide arc) is a type of a plasma discharge, where the arc channel is moving along slanted electrodes. If the configuration of electrodes permits the movement of the plasma channel, a gliding arc is formed.
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