Electrostatic Spraying with Ionized Field Charging of Twin-Fluid Nozzle and Direct Charging of Spinning Disk Nozzle (I)

Deposit Characteristics on a Cylindrical Target

Abstract

The aqueous solution of Direct-Scarlet which is the red dye was sprayed to a cylindrical target with two charging methods: one was the ionized field charging with the twin-fluid nozzle and the other was the direct charging with the spinning disk nozzle. The effects of voltage, liquid flow rate, revolution of disk and distance between nozzle and target on deposit density, deposit pattern on the target and wrap around of charge droplets were discussed and two methods were compared.
Because charged spray droplets of twin-fluid nozzle concentrated round the spray axis, the droplets were influenced by the air stream rather than the electric field, while those of spinning disk were spread widely by centrifugal force and wide electric field so that the effect of electrostatic force was larger than that of pneumatic force.