Effect of Particle Size on the Discharge Characteristics of the Bipolar Pulsed Discharge

Bipolar pulsed discharge in water-air bubble-solid particle mixture was investigated using a coaxial electrode configuration. Effect of particle size on the discharge characteristics was studied. Experimental results showed that solid particle size had significant effect on the electrical discharges in the three phase mixture. As particle size increased from 2-3 mm to 12 mm, no significant changes occurred in the peak voltage and rise time of load voltage. However an obvious "size window" existed in tail voltage and the injected power per pulse when the particles varied from 5 mm to 8 mm. Tail voltage was lower if the packed glass beads size were in the size window, while the injected power per pulse and the discharge current were much higher. Similar effect can also be found in the water treatment performance.