On the force for water drop at the tip of capillary tube electrode

The experiment about corona discharge phenomena on a water drop at the tip of the tube electrode for capillary tube electrode-to-plate electrode was made and the result of this experiment was investigated. This study is important for the basic study of corona induced vibration of a transmission-line conductor in rainy weather or of charging droplete schrabor (CDS), Which is one of the sub-micron particles collecting apparatus. The result of this experiment is summarized as follows. Water falls as a water drop at no voltage and the dripping Period become short with increasing applied D. C. voltage. On the other hand, when voltage is higher than corona onset voltage, spray phenomenon is observed. The Coulomb force that operates on a water drop at the tip of electrodo is calculated with surface tension and gravity force. Hence this characteristic of the Coulomb force vs. applied voltage is not influencd by the polarity of D. C. voltage. The charge of water drop is calculated with Coulomb force, and increases with increasing applied voltage. Under the conditions that the distance between both electrode is 5cm, and corona onset voltage is 4.6kv, Coulomb force is about 1×(10)^<-4> N, charge of a water drop is about 1×(10)^<-8> c.