Experiment on the variations of droplet diameter distribution and local flow rate over radial direction for the electrostatic spray process

The droplet diameter distribution and the local flow rate were measured at different radial positions for the electrostatic spray. The experimental results show that the average droplet diameter reduces gradually with increase of radial coordinate and its maximum value is at spray core. The droplet diameter in distribution presents a narrower and monodisperse behavior at both spray core and spray edge positions, whereas exhibits a wider and bimodal characteristic in the area between spray core and edge. It is found that the local flow rate decreases with increase of radial coordinate and its maximum value is also at spray core. The local flow rates increase at all positions over radial direction with increase of total spray flow rate. The local flow rate has an increase for larger radial coordinate positions and a decrease for smaller radial coordinate positions, when the electrostatic voltage increases and total spray flow rate remains constant.