The investigation of the proceeding route of the pulse streamer discharge in the water treatment by pulsed discharge in air with droplets of water

We are studying the treatment method that injects droplets of waste water into pulsed discharge plasma generating by the pulsed power technology as an advanced water treatment technique. The active species such as ozone and OH radical that have high oxidizing power are generated in the place injecting the droplets by the discharge, and can be effectively used to decompose organic materials that are difficult to decompose. However, there is few investigation of interaction between the pulse streamer discharge and the droplet. It is thought that the proceeding route of the streamer discharge has two patterns. One is that the streamer discharge proceeds on the surface of the droplets of water. Another pattern is that the streamer discharge proceeds in inside of the water droplets. If the streamer discharge proceeds on the surface of the droplets of water, the active species dissolve from outside of the droplets of water for treating organic materials. If the streamer discharge proceeds in the inside of the droplets of water, the active species are generated in inside and outside of the droplets of water. In this study, the proceeding route of the pulse streamer discharge in the space with droplets of water has been investigated. The results show that the propagation lengths of the pulse streamer discharge in air without droplets of water are longer than the propagation lengths of the pulse streamer discharge in air with droplets of water.. The water droplets block out the propagation of the streamer.