Dynamic behavior of droplet impacting on ultrasonic vibrated surface

Abstract

The dynamic behavior of a droplet impacting on an ultrasonic vibrated surface was performed, and the effects of surface impacting position and impact velocity on the droplet dynamics and removal process were investigated. The experimental results demonstrated that four typical impact dynamic modes can be found, including the surface uniform atomization, the unilateral directional spreading atomization, the split atomization on both sides, and the sub-balance state. The uneven forces induced by the ultrasonic vibration is the main cause. It is also found that the ultrasonic effective zone and failure zone can alternately appear on the circular surface, and the droplet can be removed instantaneously as it has impacts on the ultrasonic effective zone. In addition, the spreading factor can be effected by the impact dynamic modes and promoted by the ultrasonic vibration. Moreover, the transformation of the impact dynamic modes can be seen with the increasing impact velocity. The result shows that the impact droplet can be effectively removed by the ultrasonic vibration, avoiding the droplet deposition.