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4.3. REACTION KINETICS MODEL 4. FLUID MODELLING OF CO2 DISSOCIATION channels as a function of the mean electron energy are shown in figure 4.2. E/N (Td) 20 48 104 199 346 537 10 1 10 0 10 −1 10 −2 10 CO (010) 2 CO (100) 2 CO (020) 2 CO (001) 2 CO (002) 2 CO (3Σ+) 2u CO (1Σ+) 2u Dissociation + 2 + CO (A) 2 + CO (B) 2 Momentum transfer Attachment CO 0.024 1 2 3 4 5 6 7 8 9 10 Mean energy (eV) Figure 4.2: Fraction of power transferred into important channels as a function of mean electron energy at Tg = 400 K. Selected reduced electric field values are also added. Only important channels are shown for the sake of clarity. It is found that almost all power is dissipated in vibrational excitation of CO2 for mean energies below about 1.2 eV, where the excitation of the asymmetric mode level CO2(v31), i.e., CO2(0 0 1), is generally the dominant one. The contribution of this vibra- tional excitation decreases for larger mean energies and the electron impact excitation of the electronically excited states CO2(3Σ+u ) and CO2(1Σ+u ) becomes predominant above about Ue = 3.0 eV. The electron impact dissociation of CO2 ground state molecules consumes 1 % of transferred power at a mean energy of 3.5 eV increasing to about 5 % at larger Ue. The fraction of power dissipated in ionizing collisions increases continu- ously above about 2.0 eV and becomes larger than the dissociation for Ue = 3.8 eV. At the same time, the contribution of the momentum transfer in elastic collisions and the dissociative electron attachment are of minor importance in general. These results show great similarity with those presented e.g. in [36, 63], where an analysis with respect to the reduced electric field dependence is represented. This global consideration indicates that low mean energies (and reduced electric fields) are favourable for CO2 dissociation that is induced by vibrational up-pumping along the asymmetric mode. Nonetheless, for vibrational up-pumping to contribute sig- nificantly to CO2 dissociation, a remarkable population of vibrational levels is required, which, in turn, leads to modifications of the discussion due to the expected impact of su- perelastic electron collisions of the distribution function similar to the results for nitrogen reported in e.g. [194]. 89 Fraction of transferred power (%)PDF Image | Understanding CO2 containing non-equilibrium plasmas
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