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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3.3. RESULTS 3. PROPERTIES OF MICRO-DISCHARGES 0.8 0.6 0.4 0.2 0.0 8 12 16 20 24 400mbar, 700 sccm 400mbar, 400 sccm 700mbar, 700 sccm 700mbar, 400 sccm U Figure 3.7: Plot showing power consumed by plasma at different voltages. Uo is the amplitude of the applied voltage signal. flows and pressures has been shown as a function of amplitude of applied voltage signal Uo in figure 3.7. This result is to be expected as there is a 5 orders of magnitude dif- ference in time scales between the flow (in ms) and power injection (hundreds of ns). The frequency is not varied in the experiments and its effect is not discussed; since fre- quency is not changed energy injected per cycle and power can be interchangeably used (Pavg = Ecyclef). 3.3.2 CO2 conversion efficiency As has been already mentioned, conversion efficiency of CO2 into CO, α is very much determined by Espec. If Φ is used to determine Espec, then equation 3.2 transforms into Espec = Pavg (3.6) Φ Now, the effect of Pavg and Φ can be independently studied. Φ is found to effect the conversion efficiency by changing the residence time. For example, if everything else remained constant the conversion efficiency doubles if the residence time is doubled, provided there is no saturation in CO production. Once it has been verified that flow does not have any effect other than changing the residence time, a flow of 700 sccm was selected. Any lesser flows requires a longer times to stabilize and faster flows are not desirable as they yield far little conversion below the detection limits. o (kV) 53 Power (W)

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