Numerical Study Of Pulsed Corona Discharge With Dust Particles At Atmospheric Pressure

Atmospheric non-thermal pulsed corona has been investigated theoretically and experimentally worldwide and become a very technologically promising technique for a number of applications especially in the area of pollutant abatement. The study of such discharges with the presence of dust particles is significantly practical since such existences are probably capable of modifying the properties of PCD.Numerical investigation of a pulsed corona discharge has been carried out in the wire-cylindrical electrodes with the introduction of dust particles, which is initially presumed throughout the reactor uniformly. A dust-charging model has been employed and developed. Based on the simulation began with a constant voltage of 35kV applied to the anode, comparisons have been conducted among cases with dust of different particle radii and densities within the range of 1- 8μm 106-107cm-3 respectively. The evolutions of electron density, the electric field, the current in the external circuit and the propagation of the ionizing wave have been examined respectively. The charging process is also simulated by precisely monitoring the spatiotemporal distribution of the absolute charged number on the dust particles.Results indicate that such physical properties of the discharge can be influenced by the charging process of the dust particles in the reactor. Charged particles especially electrons can be captured, leading to the loss of the electrons behind the ionizing wave front, which is sufficient to weaken the electric field and retard the wave propagation. The distinctions between results of different cases appear to be more remarkable with the lapse of time, which can be barely observed in the early stage of discharge(~50ns) . Such influence will become more effective as we enhance the value of dust density or radius. For the configuration in our study, the discharge tends to be favorably sensitive to the influence of dust particles when N_d =10~7 cm~-3. Inparticular, the propagation of the ionizing wave can be terminated by adequately choosing the value of dust density and radius.