Atmospheric Negative Corona Discharge Observed at Tip of Taylor Cone Using PVA Solution

We propose a new scheme for generating atmospheric dc corona discharges using a Taylor cone. When a negative high voltage was applied to an ethanol solution containing sodium sulfate, a Taylor cone was generated, and negative corona discharges were observed at the tip of the cone. When a polyvinyl alcohol solution with higher viscosity was used, corona discharges appeared along the liquid filament at positions 0.7-1.0 mm higher from the tip of the cone. Various modes of corona discharge were observed by varying the viscosity, electrical conductivity, and applied voltage.