By James P. Hartnett, Alexander Fridman, Young I. Cho, George A. Greene, Avram Bar-Cohen
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Extra info for Transport Phenomena in Plasma, Vol. 40
If the applied electric ﬁeld is high enough, it will cause microdischarges to be developed in each unoccupied space so that the gap becomes ﬁlled from end to end. , before polarity changes), one of the electrodes remains positive and the other is negative. The streamer always moves in one direction so that subsequent streamers and thus microdischarges have a small probability of forming in the same place until the microdischarge remnant has dispersed. A different situation appears in the case of alternating voltage.
This breakdown mechanism sequence is not valid for very long gaps – particularly in electronegative gases (including air). It happens because the streamer channel conductivity is not high enough to transfer the anode potential close to the cathode and stimulates there the return wave of intense ionization and spark. In the electronegative gases where the streamer channel conductivity is lower this effect is especially strong. Also in non-uniform electric ﬁelds, the streamer head grows from strong to weak ﬁeld region, which slows down its propagation.
7. Limitations of the wire conﬁguration of the corona are related to the durability of the electrodes and also to the non-optimal interaction of discharge volume with incoming gas ﬂow, a phenomenon which is important for the plasma-chemical applications. From this point of view, it is useful to use another corona discharge conﬁguration based on multiple stages of pin-to-plate electrodes . This system is obviously more durable and it is able to provide a good interaction ARTICLE IN PRESS NON-THERMAL ATMOSPHERIC PRESSURE PLASMA WIRE ELECTRODE FURNACE FURNACE THERMOCOUPLE 29 THERMOCOUPLE FIG.