Plasma Activated Water Production by Magnetically Driven Gliding Arc

The gliding arc plasma has been widely used for the plasma nitrogen fixation (PNF) and the plasma-activated water (PAW) production. The gliding arc starts in a narrow gap between two diverging electrodes. If the gas flow between the electrodes is fast enough, it forces the arc to move and elongate along the electrodes. As the length of the arc column increase, more power is demanded to sustain the arc, resulting in the more effective synthesis of nitrogen oxide molecules. But in this system, the larger airflow can lower the concentration of nitrogen oxides, which may adversely affect the production of PAW. In this study, in order to elongate the arc column without gas flow, the magnetic field was applied perpendicular to the arc column. It was confirmed that the expansion and movement of the arc column by the magnetic field were effectively realized. The energy consumption of arc plasma during some periods is measured to be constant regardless of the strength of the magnetic field. It was confirmed that the decrease in the gas flow rate is an important factor to improve the efficiency of PAW production.