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4. FLUID MODELLING OF CO2 DISSOCIATION 4.3. REACTION KINETICS MODEL (EVDF) over the kinetic energy U of the electrons, where Qd, Qin , and Qat are the cross section for momentum transfer in elastic collisions, for the inelastic collision pro- cess considered with the energy loss Uin and for electron attachment, respectively, k j,m B and Tg denote the Boltzmann constant and gas temperature, and f0(U) is normalized according to ∫ ∞ √Uf0(U)dU = 1. 0 4.3 Reaction kinetics model In addition to the electron component, the reaction kinetics model includes the 42 heavy particle species listed in 4.1. As products of dissociation reactions of CO2, carbon monoxide (CO), molecular oxygen (O2), ozone (O3) and atomic oxygen (O) are taken into account (species 2-5 in table 4.1). Because up to 97 % of electron energy can be in- jected into vibrational excitation in molecular plasmas [154], vibrationally excited states in CO2 plasmas are particularly important as they are expected to enhance the disso- ciation rates [36]. Thus, 28 vibrationally exited species (species 6-33 in table 4.1) are considered to describe the evolution of electron energy accurately and to analyse their role in the CO2 dissociation. Furthermore, two electronically excited states of CO2, as- signed by 3Σ+u and 1Σ+u , as well as the positive ion of CO2 in its ground state (X2Πg) and in the two excited states A2Πu and 1Σ+u are taken into consideration. The later are in- troduced to allow for comparison with optional measurements of their optical emission. In addition, the four negative ions O–, O–2, CO–3 and CO–4 are included in the reaction kinetics model. 82 jj,m jPDF Image | Understanding CO2 containing non-equilibrium plasmas
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