On the Forces and their Effects for Movement of Particles in Corona discharge Field

Electrical resistivity of some industrial dust particle plays a basic roll in electrical precipitation. Particle resistivity greater than 10^<10> ohm-cm or smaller than 10^4 ohm-cm lead precipitator efficiency to reduced condition. So, to study on the behavior of particles in electric field, the author suspended a model particle of some shape and electrical properties in an electric field of which positive electrode in plate and negative electrode is group of needles. The parameter of model particles are diameter, specific gravity and dielectric constant. The author analysed the nature of various forces which act upon the suspended model particle in respective case. The results of these experiments are as follows. 1. The ionic wind occure remarkably, but its effects on the displacement of model particle is negligible small. 2. The gradient force work on the suspended particle movement at just before passive or negative electrode some remarkably. Nevertheless its effect for displacement of model particle are substancially negligible small at this experiment. Because the experiments were carried at the space between the electrodes where gradient force is feeble. 3. The experimental data show good agreement with theoretical displacement which derived solving the next function. (+)Fc+(+)F_I+(-)Fg=0 where, (+)Fc : Coulomb force (+)F_I : Image-force (-)Fg : Gravitational damping force 4. The displacement of model particle is due to (+)Fc bascally, but with near collecting electrode, it depends on (+)Fi substantially. The behavior in the latter case could have observed clearly at this experiment.