On the Discharge Pressure for High Electric Conductivity Particle in Corona Discharging Field

A negative corona discharging field was constructed with a positive plate-electrode and a negative multi needle-electrode and a model partiele was suspended in this field. Within the sufficient field strength for the model particle to attach on the plate-electrode, the low conductivity model particle sticked on these and the high conductivity model particle was attracted there keeping some gap of spark discharge with slight vibration. The same behavior as for the high ccnductivity model particle was observed when the plate-electrode surface was covered with thin water film. The amplitude and period of the discharge current waveforms through the probe electrode when a glass ball was suspended within the corona discharging field were little than that for a steel ball. At later case, the discharge gap between the plate-electrode and a steel ball are investigated by the spark discharge. The authors called the force which gave the discharge gap as ”discharge pressure”. It is expected that the discharge pressure may come to appear at the field strength about 6kv/cm the steel ball of which diameter is larger than 367μ, and that it may come to appear as far as the steel ball of larger diameter within less field strength. Those experimental results are interested in studying the phenomena of difficulty for electrical precipitator of coagulated high conductivity particle.