Drop Charging as a Space Charge Indicator in a Tri-electrode Atmospheric Discharge

R SOSA; J.MARTINEZ; D. GRONDONA; A.MARQUEZ; H KELLY; G. ARTANA

Mar del Plata

Congreso; XIV LatinAmerican Workshop on Plasma Physics; 2011

In this work we present measurements of the charge acquired by water droplets passing through the gap of a three electrode discharge (tri-electrode). The tri-electrode discharge is based on the combination of a dielectric barrier discharge (DBD) with a positive or negative corona discharge (CD) in atmospheric air. The DBD is established applying an ac voltage between two flat aluminum foils electrodes placed at the opposite sides of an dielectric plate, and the CD discharge is generated applying a dc voltage either to a third flat aluminum foil electrode or to one of the DBD electrodes. Between the DBD electrodes and the third electrode, there is a 20 mm air gap. A train of droplets passes through the center of the inter-electrode gap. This train is produced by the breakup of a water jet generated with a small capillary vibrating at a fixed frequency to produce mono sized droplets (of the same size).