MATHEMATICAL-MODELING OF CONDUCTIVE PARTICLE MOVEMENT IN DC CORONA FIELDS

The system of differential equations which describes the conductive particle movement in a d.c. corona field was written, taking into account the electrical and mechanical forces which act upon spherical objects in the proximity of an electrode. The paper put a special emphasis on the action of the ''electric wind'', associated with the injected space-charge, and on the effects of particle charge variation, while moving in mono-ionised electric fields. A numerical method of field analysis was employed to calculate: (i) the electrical charges and forces on the particles; (ii) the conditions which lead to electrical discharges between the particles and the electrodes. A good agreement existed between the computed characteristics of particle movement and the experimental results in a coaxial wire-cylinder electrode system.