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

Deposit droplet size distribution and spread surface mean diameter

Abstract

The deposit and spread diameters of sprayed droplets with an ionized field charging twin-fluid nozzle (RG) and a direct charging spinning disk nozzle (MB) were measured by an image data analyzer. The distribution functions and spread surface mean diameters were calculated and discussed.
The deposit and spread droplet size distributions of RG and MB were conformed to the Nukiyama-Tanasawa's distribution function.
The spread surface mean diameter of RG was affected by atomizing air flow rate Q_aa and the droplet size distribution became more uniform with increase of Q_aa. The mean diameter of MB was extremely decreased and the droplet size distribution became narrow and uniform with increase of voltage V and rotational speed N. And also, the mean diameter of MB became larger and the distribution became more ununiform with increase of distance from center of spray pattern to the sampling position.