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3. PROPERTIES OF MICRO-DISCHARGES 3.6. CONCLUSION For the concentration of CO to subside significantly at the location of the production it will take hundreds of microseconds (see appendix 3.A). Meanwhile due to the memory effect, many filaments would strike at the same location at typical frequencies used in a DBD. The difficulty in creating the new filaments should manifest even in a given cycle. Since the remnant gas composition is completely different than pure CO2, this could be another reason why the second filament propagates along the periphery of the remnant of the first filament – A consequence of volume mechanism for memory effect. Another effect of change in gas composition is the change in relative importance of different chemical reactions. For example, CO recombination with atomic O is very slow at low concentrations of CO and O; with a three-body reaction rate coefficient of 10−35cm6s−1 [67]. However, as their production increases with Espec, recombination reaction becomes important; net effect of these loss processes is a slower increase in CO. Different variants of loss processes are dealt in detail in [60] and [62]. 3.6 Conclusion In this chapter it was shown that the power-law relation observed between conversion efficiency (α) and specific energy input (Espec) can be extended to a single filament. A simple method to detect the time instant of the filament enabled measuring the character- istics of filaments such as charge transferred by individual filaments, power consumed by individual filaments and filament density per half cycle (Navg). The charge transferred per filament has been found to be independent of pressure and is strongly correlated with the power input. For the first time filaments in CO2 DBDs have been imaged using iCCD camera which showed the effect of surface on the filament development. Navg has been shown to be constant with pressure and flow at a constant power consumed. A fairly general relation between energy required to create CO and Navg is also established. Re- lation between Navg and energy per cycle also showed a similar power-law which shows that the difficulty in creating new filaments could be the reason of the power-law relation observed between α and Espec. This hypothesis is further validated by optical imaging which showed that the second filament spreads longer, because of the electric field dis- tortion caused by charge deposited by the first filament. With the increase in the length of the second filament, there is an increase in the charge transferred. Finally an argument to show that this phenomena can be extended to other configurations has been presented. 66PDF Image | Understanding CO2 containing non-equilibrium plasmas
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