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Chapter 5 Vibrational kinetics in CO2 dielectric barrier discharges Abstract Part I: In the first part of this chapter, theoretical background and the im- portance of vibrational excitation in dissociation of molecules in plasma is introduced and substantiated. Different types of reactions responsible for vibrational energy cre- ation, exchange and loss in a single vibrational mode are discussed in detail. The condi- tions for emergence of different non-equilibrium vibrational distributions which enhance dissociation rates are explained. Later, the discussion is extended to CO2 a polyatomic molecule with several modes of vibration. A special focus is given to the independence of vibrational modes in CO2 in the context of energy efficient dissociation Part II: In the second part of this chapter, a reaction kinetic scheme to calculate the vibrational kinetics, especially in asymmetric mode of CO2 is introduced. Calculations performed using the reaction kinetic scheme, with the fluid model presented in chapter 4, to simulate vibrational kinetics in a DBD reactor are discussed. Two sets of calculations are performed: First set includes only the first two vibrational levels in asymmetric mode, and the second set includes all the vibrational levels up to dissociation limit in the asym- metric mode. In the first study, a detailed analysis of all production and loss processes of excitation of initial vibrational levels is performed; electron density is found to be the key parameter that determines the vibrational excitation. In the second study, using an extended kinetic scheme that included 20 vibrational levels along the asymmetric mode, vibrational distributions have been calculated. From the calculated vibrational distribu- tions an upper limit on CO2 dissociation from VV transfer along asymmetric mode has 107PDF Image | Understanding CO2 containing non-equilibrium plasmas
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