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and those that are calculated from theory. Using the fluid model introduced in chapter 4, and reaction kinetic scheme adapted from literature, simulations were performed to study vibrational kinetics in a DBD. By using a pulsed model, relative importance between the VV -transfer, electron impact excitation, de-excitation and VT relaxation to and from the initial excited states has been evaluated. It has been found that electron density is the key parameter that controls the rate of excitation at high pressures. As a consequence, it has been shown that any plasma process that has a very high ionization cost cannot achieve high energy efficiency. In order to save the electron density from recombining, frequency modulation such as the one used in RF discharges is suggested. By consid- ering extended set of vibrational levels in a asymmetric mode, it has been shown that similar vibrational distributions are achieved at different operational parameters which is linked to the creation of initial vibrational levels. From the time evolution of vibrational distributions, rate of CO production from VV transfer has been estimated and it has been shown that it is mainly determined by the rate at which initial levels are created. For example, when the total number of initial vibrational levels are changed only by a factor of two, CO produced from VV transfer has been shown to increase by a factor of three. It has been shown that though non-equilibrium populations are possible in the vibrational levels of asymmetric mode under some assumptions, however, such over populations are not sufficient to reduce the energy required CO2 dissociation; it is mainly because of lack of selective coupling of energy into VV transfer in a filament of DBD, where reduced electric field emerges on a very fast time-scales and is not easily amenable for external control. Acknowledgement The numerical code (fluid model) used in this chapter was developed by Dr. M.M. Becker in the group of Priv. -Doz. Dr. D. Loffhagen from INP Greifswald. The electron kinetic data was supplied by Priv. -Doz. Dr. D. Loffhagen. 146 5.10. CONCLUSIONPDF Image | Understanding CO2 containing non-equilibrium plasmas
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