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1. GENERAL INTRODUCTION 1.3. THESIS OUTLINE 8 flow, applied voltage, frequency, and distance between the elec- trodes used, CO2 conversion will remain same for same specific energy input. In chapter 3, using results from electrical and chemical diagnostics on a pin-pin DBD reactor, the power-law is shown to be valid up to a single filament – the fundamental unit of the DBDs. A purely electro- static reasoning to explain the power law is proposed in this chapter. In simple terms the electrostatic explanation is: the charge deposited by preceding filaments in the same half-cycle will oppose the development of subsequent filaments increasing the energy requirement for creat- ing the additional filaments. This explanation is validated by a simple model, measured charge transport from individual filaments, measured filament density, and are complemented by fast imaging of individual filaments using an iCCD camera. In chapter 4, results from fluid modeling of pure CO2 DBDs are presen- ted. Here, contributions from various channels to CO2 dissociation to produce CO, electron impact induced or otherwise, as calculated from the model are discussed in detail. Electron impact dissociation of CO2 has been shown to be the most important channel for CO production. The time scale of filament development is in the range of few nano- seconds during which most of the energy is deposited in the electrons and corresponding dissociation channels. Compared with this fast pro- cess, the range in which operational parameters can be varied is very little. For instance, the frequency of the applied voltage can be var- ied in the range of 100 kHz (≈ 10−4 s). As a consequence of relat- ively static nature of operational parameters, they have been shown to have very little influence on the self-sustaining development of fila- ment, given once the filament is initiated. The strong scaling behavior of CO2 conversion can be attributed to this difference in the timescales coupled with negligible CO recombination back to CO2 in cold CO2 background. In the first part of the chapter 5, the theory related with the vibra- tional excitation in plasmas is discussed in detail. The favorable con- ditions for different vibrational distributions are discussed in its gener- ality and later extended to the specific case of vibrational distributionsPDF Image | Understanding CO2 containing non-equilibrium plasmas
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