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Understanding CO2 containing non-equilibrium plasmas

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Understanding CO2 containing non-equilibrium plasmas ( understanding-co2-containing-non-equilibrium-plasmas )

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3. PROPERTIES OF MICRO-DISCHARGES 3.3. RESULTS 100 10-1 10-2 10-3 100 101 102 103 Espec (J/l) 104 105 Figure 3.8: Conversion efficiency measured using various conditions. Blue open stars are measured in plane-plane configuration: taken from [60] and [67]. The rest of the data points are measured with pin-pin configuration with pressures: blue squares 200 mbar, red circles: 400 mbar, green triangles: 600 mbar, yellow inverted triangles: 700 mbar. Φ= 700 sccm. Conversion efficiency as a function of Espec at different pressures is plotted in figure 3.8. As can be seen in the figure 3.8, conversion efficiency increases monotonically Espec independent of pressure. It follows the same trend line as the one reported by Brehmer et al at different pressures, frequencies, flows and gas gaps [60] (shown as green stars in the figure 3.8). With this observation it can be clearly said that Espec has been shown to be valid as an universal scaling parameter up to very low values. 3.3.3 Filament statistics To understand the connection between the average number of filaments per half cycle (Navg) and conversion efficiency, Navgwas measured as a function of applied voltage, pressure and flow using the method outlined in section 3.2.2. The results, Navg versus power, are plotted in figure 3.9 for different pressures; unfortunately, 1000 mbar could not be used due to operational difficulties. In general, Navg increases monotonically with power input. It is not surprising that the flow was found not to have influence because of the difference in the time scales. However, similar Navg for same Pavg at different pres- sures is unexpected and has not been reported previously. Also, it becomes increasingly 54 Conversion efficiency - (%)

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