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4. FLUID MODELLING OF CO2 DISSOCIATION 4.4. RESULTS AND DISCUSSION 3 2.5 2 1.5 1 0.5 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Position (mm) Electron impact dissociation Dissociative attachment Dissociative recombination Total CO production Figure 4.7: Spatial variation of the CO molecules generated during one voltage cycle by electron impact dissociation, dissociative electron attachment, dissociative electron-ion recombination, respectively, and in total during one voltage cycle. density shown in figure 4.5a is mainly caused by different contributions of electron-ion recombination in positive and negative half-cycles. 4.4.1 Universal scaling parameter of CO2 dissociation According to the analysis of the related DBD experiment given in [60], the SEI (4.2) can be considered as the universal scaling parameter for the CO2 conversion to CO (also see chapter 3). Because a flow of the gas transverse to the direction of the discharge is not considered in the spatially one-dimensional model and thus the residence time tr of gas molecules in the active plasma zone is an open parameter, the power spent per CO2 molecule PCO2 = Pd (4.20) nCO2 is introduced and correlated with the CO2 conversion frequency ∆nCO/(nCO2T) in fig- ure 4.8. Here, the average power density Pd is determined by f ∫ t0+T Pd = d t0 and ∆nCO denotes the increase of the spatially averaged CO density during one voltage cycle of length T = 1/f. The results represented in figure 4.8 have been obtained by a number of model cal- culations for the operational parameters given in table 4.6, where only one parameter 98 J(t)Vg(t)dt (4.21) CO density (1012 cm−3)PDF Image | Understanding CO2 containing non-equilibrium plasmas
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