Influence of Corona Discharge from a Wire Particle Located in a DC Electric Field on its Precessional Motion

概要

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Influence of corona discharge on the precessional motion of a wire particle located in a dc electric field formed by a parallel plate electrodes system was investigated experimentally. A copper wire with 0.25 mm in diameter and 6 mm in length was used as a wire particle. When an applied voltage to the parallel plate electrodes exceeded the lift-up voltage for the wire particle placed at the lower electrode, the particle moved in several manners depending on the polarity of applied voltage or polarity of the particle. A negative particle kept standing or precessional motion stably while a positive particle tended to cause spark or to leave the lower electrode and cross the gap. During precessional motion of a negative particle, a micro gap often formed between the wire particle and the lower electrode. From the analysis of high speed pictures of precessional motions, it was shown that the rotation speed of the particle was strongly affected by the edge shape of the wire particle. Corona discharge is a source of rotational and precessional motion. Space charge formed at a vicinity of the wire particle would inevitably play an important role to make a particle rotate and tilt associating with induced charge at the tip of the particle.
社団法人電気学会の論文
2007-11-01