Increase in input power and change of streamer length during rotation of electrode

An increase in ozone production efficiency is sought by scientists due to the important role ozone plays in improving the human environment such as maintaining higher water and air quality. Ozonizers with electrode rotating systems are a possible way to increase ozone synthesis efficiency. Important questions are why rotating electrodes increase ozone concentration and how they can be controlled. Phenomena determining the increase of ozone concentration must be identified. In our case, a gold rotating electrode was used to eliminate the surface oxidation effect. The oxygen flow rate was 0.5 l/min, applied voltage 10 kV (peak to peak), and frequency approximately 12 kHz. Both ozone concentration and ozone production efficiency improved with the use of a rotating electrode compared to that with a non-rotating electrode, with ozone concentration increasing to about two times higher than that of the case with non-rotation. In addition, input power and discharge area were found to increase with rotating speed. These increases may be due to the increase of discharge length of micro-discharges during electrode rotation. Discharge streamer changed in both shape and length, with the length increasing 10-20%. Ozone produced increased with increasing electrode rotation speed, and the efficiency of ozone production improved by 30% by rotation. In addition, the discharge area became more intense with rotation. Longer micro-discharges during rotation allows generation of an increased number of collisions, leading to higher ozone concentration, which in turn is expected to lead to higher efficiency of ozone generation.