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5.10. CONCLUSION 10-2 10-3 10-4 1000 mbar 10-2 10-3 10-4 800 mbar 10-2 600 mbar 10 15 20 Number of On-cycles 10 15 20 Number of On-cycles 10-3 10-4 10 15 20 Number of On-cycles Figure 5.15: Ratio of CO by VV with CO from other process (β) after time period of 20 cycles with different number of cycles voltage-on at at 1000, 800 and 600 mbar In figure 5.15, β calculated at different conditions is plotted. If we compare the CO production from VV transfer with other channels, it is atleast two orders of magnitude smaller owing to difference in time scales. In a DBD, CO is produced mainly by elec- tron impact dissociation (see chapter 4) and the very high ionization produces significant electron density for a short time-scales. In the framework of model, there is one filament every half cycle producing CO (> 1018cm3s−1) at rates far exceeding that of Φ. Con- sequently, energy efficiency of producing CO from VV transfer alone is also worse by 2 orders of magnitude. In reality VV transfer processes requires energy only in the form of creation of seed states and thermal energy in the form of gas temperature. It can be made much more effective than what is predicted by increasing energy coupling into the seed states alone. The selective coupling is not possible in a DBD configuration due to self determination of reduced electric field once streamer is formed and hence energy con- sumed by VV transfer cannot be decoupled from other processes. The lowest efficiency is achieved at 600 mbar, because though CO produced from other channels decreases at this condition, CO produced from VV transfer decreases even more. 5.10 Conclusion In this chapter, the requirement for reliable rate co-efficients for VV-transfer in asymmet- ric mode has been brought home by comparing what can be inferred from experiments 145 βPDF Image | Understanding CO2 containing non-equilibrium plasmas
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