Effect of ultrasound waves on a hollow needle to plate electrical discharge in air or mixture of air with VOCs

Abstract

The plasma technologies based on corona discharge in a stationary medium are not suitable for applications such as efficient ozone generation, VOC decomposition etc. The reason is that corona discharge is relatively low power electrical discharge. The increase of the discharge power leads to the transition of the corona discharge to the spark. Discharge stabilization and at the same time the discharge power enhancement can be achieved by different ways. One of these is the application of the airflow with respect to the active electrode [1,2]. Still further increase of the discharge current-voltage range can be achieved by the application of ultrasound waves. In this paper we demonstrate that the proper application of the ultrasound waves can increase the current-voltage range of the discharge beyond the limits, which are reached by simple application of the airflow. In this way it is possible to obtain higher density of electrons which are the starting particles for wide range of plasmachemical reactions leading to ozone generation, VOC decomposition etc. The discharge used in our experiment was the hollow needle to plate electrical discharge enhanced by the flow of air or mixture of air with VOC.PACS : 52.80.Hc, 52.35.Dm

Hybrid Plasmas for Materials Processing

“…As a result, the probability of the plasma reactive species reaching the surface before inactivation is higher when ultrasonic waves are applied, which improves surface modification efficiency. Combinations of a plasma and ultrasonic waves are investigated for understanding the interaction between plasma and acoustic waves [113][114][115], electrical discharge machining [116,117], plasma etching [118], ozone production [119][120][121][122], decomposition of volatile organic compounds (VOC) [123], charging performance improvement of corona chargers [124], and surface modification [104][105][106][107][108][109][110][111].…”