Development of High Efficiency Ozone Generation Using Non-equilibirum Plasma Based on Hydrodynamic Instability

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Conventionally, ozone was produced from oxygen using non-equilibrium plasma silent discharge. A new ozone generator has been suggested in order to effectively separate generated ozone from ambient oxygen in non-equilibrium plasma (silent discharge). The separation principle is based on the difference between the centrigugal forces for ozone and oxygen, and the fluid motion associated with Taylor instability. To this end, an annular shaped prototype composed of a fixed outer cylindrical electrode and a rotating inner one was designed. The outer electrode is a copper block with cooling pipes (the inner diameter of the electrode is 42mm) ; the inner electrode is the Pyrex cylinder, the inner side of which is plated with nickel (the outside diameter the electrode is 40mm). Experiments were conducted varying the oxygen flow rate, and the rotation speed of the inner electrode (0-4000rpm), and the supplied electrical current frequency (250-2000Hz) with the fixed voltage of 10kV.The effect of the inner electrode rotation is significant for low flow rate. This is because the residence time of the supplied oxygen inside the discharge section is relatively longer for smaller flow rate. The ozone concentration increases with increasing rotation rate, and the attained maximum ozone concentration is about 1.5 times as large as that without rotation. However, the ozone generation efficiency is not so improved with increasing rotation rate of the inner electrode. Hence, at the present stage, our aim has not been fully realized ; in order to find the optimum condition when the suggested principle works properly, the detailed clarification of the phenomena is necessary as a next step of the present study.