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4. FLUID MODELLING OF CO2 DISSOCIATION 4.3. REACTION KINETICS MODEL particles are taken into consideration where the corresponding rate coefficients depend on the mean energy Ue of the electrons. For their determination, the collision cross section data of the respective reference was used. In particular, the collision cross sections for electron impact de-excitation processes are determined by use of the principle of detailed balancing using the statistical weights given in table 4.1. In addition, four collisional or associative detachment processes are included and listed in table 4.2, which also con- tribute to the electron energy balance (4.5). Notice that the interaction of electrons only with CO2 is taken into account in the present reaction kinetics scheme. This approach is justified by the low conversion degrees of less than 5 % observed in corresponding experiments [59, 60] and leads to a decrease of the number of species to be considered in comparison with other recent studies reported e.g. in [64]. 84 Number Reaction Rate coefficient Reference [175] [176] [176, 177] [177] [176] [178] [176] [176] [176] [176] [176] Analogous to E2 [176] Analogous to E6 [177] Analogous to E12 [176] Analogous to E4 [176, 177] Table 4.2: Electron impact reactions considered in the model. The rate coef- ficients of reactions E1–E53 are obtained from the solution of the electron Boltzmann equation as a function of the mean electron energy Ue using the cross section data of the respective reference given. The energy rate coefficient for elastic collisions Kel and the energy rate coefficients for two-body attach- ment Kat are given in eVm3s−1. All other rate coefficients are given in m3s−1 for two-body collision processes. Te = 2Ue/(3kB) is the electron temperature in K, and Tg is the gas temperature in K. †: Analogous to E47 and shifted by threshold energy Elastic electron collisions E1 CO2(v0) + e −−→ CO2(v0) + e Kel(Ue) Electron impact excitation and de-excitation of vibrational levels E2, E3 E4, E5 E6, E7 E8, E9 E10, E11 E12, E13 E14, E15 E16, E17 E18, E19 E20, E21 E22, E23 E24, E25 E26, E27 E28, E29 CO2(v0) + e ←−→ CO2(v1) + e CO2(v0) + e ←−→ CO2(v2a) + e CO2(v0) + e ←−→ CO2(v2b) + e CO2(v0) + e ←−→ CO2(v31)+ e CO2(v0) + e ←−→ CO2(v32)+ e CO2(v0) + e ←−→ CO2(v4)+ e CO2(v0) + e ←−→ CO2(v5) + e CO2(v0) + e ←−→ CO2(v6) + e CO2(v0) + e ←−→ CO2(v7) + e CO2(v0) + e ←−→ CO2(v8) + e CO2(v1) + e ←−→ CO2(v2b) + e CO2(v1) + e ←−→ CO2(v4)+ e CO2(v1) + e ←−→ CO2(v5) + e CO2(v2a) + e ←−→ CO2(v5) + e f(Ue) f(Ue) f(Ue) f(Ue) f(Ue) f(Ue) f(Ue) f(Ue) f(Ue) f(Ue) f(Ue) f(Ue) f(Ue) f(Ue)PDF Image | Understanding CO2 containing non-equilibrium plasmas
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