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4.4. RESULTS AND DISCUSSION 4. FLUID MODELLING OF CO2 DISSOCIATION Standard condition Pressure Temperature Voltage Frequency Dielectric permittivity 6 60 kHz 300 K 8kV 90 kHz 600 mbar 4.5 500 K 11 kV 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 6 8 10 12 14 16 18 20 22 Power per CO molecule (eV/(s molecule)) 2 Figure 4.8: CO2 conversion frequency as a function of PCO2 for the parameter conditions of table 4.6. with respect to the standard condition was changed for the respective parameter vari- ation. Obviously, a linear dependence of the conversion frequency on the power spent per CO2 molecule is obtained for all discharge conditions considered. In particular, with decreasing temperature, voltage and frequency the CO2 conversion frequency decreases linearly while the gas pressure has an inverse effect: A decrease of pressure leads to higher power per CO2 molecule and at the same time to a higher CO2 conversion. For dielectric materials with slightly larger permittivity a markedly higher power density is obtained. The linear dependence of the CO2 conversion on the input power predicted by the model calculations for the variation of five parameters is in reasonably good agreement with the experimental results reported in [60]. In the experiment however, as noted in the previous chapter, the conversion degree follows a power-law approximately when large range of SEI is considered and approximately linear when a narrow range of SEI is considered. In the range of SEI as those reported in [60], a linear scaling of the CO2 conversion has also been observed in [64], where a global time-dependent model was applied for the theoretical description of an atmospheric pressure DBD using a constant average power density and gas temperature as input. In order to compare the modelling results directly to the measured CO2 conversion degree in dependence on the specific energy input, the parameters α and SEI are determ- 99 CO conversion frequency (1/s) 2PDF Image | Understanding CO2 containing non-equilibrium plasmas
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