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4.4. RESULTS AND DISCUSSION 4. FLUID MODELLING OF CO2 DISSOCIATION E ' Figure 4.6: Temporal variation of current density and spatially integrated CO dens- ity (a) and spatiotemporal change of the CO production (b) due to electron impact dissociation (black grid lines), dissociative attachment (grey grid lines) and dissoci- ative recombination (no grid lines) over one representative voltage cycle. In blank regions the CO production rates are smaller than 1014 cm−3. CO at every position in the gap. The particle density Nj,m(x) of a species j generated by the two-body electron collision process m during the period T = 1/f is given by ∫ t0+T Nj,m(x) = ne(x, t)nm(x, t)kj,m(Ue(x, t))dt (4.19) t0 in the framework of the fluid model, where nm denotes the density of the collision part- ner in the process m and kj,m is the corresponding collision rate coefficient depending on the mean electron energy (cf. equation (4.14)) and t0 denotes a certain instant of the periodic state. The resulting densities of CO generated by electron impact dissoci- ation (reaction E42 in table 4.2), by dissociative electron attachment to CO2 (reactions E47–E53), by dissociative electron-ion recombination (reaction E54), respectively and in total during one voltage cycle are shown in figure 4.7. The results confirm that the CO2 dissociation in electron collisions is the dominant CO production channel. Furthermore, it becomes obvious that dissociative attachment and recombination processes contribute with almost equal parts of about 10 % to the CO production. Figure 4.7 also highlights the spatial asymmetry of the CO production which is caused by the differences in negative and positive half-cycles. In particular it becomes obvious that the asymmetry of the CO a) b) 97PDF Image | Understanding CO2 containing non-equilibrium plasmas
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