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5.8. STUDIES Table 5.1: Table showing the species of asymmetric mode included in two dif- ferent studies Study Study A Study B Vibrational levels of asymmetric mode included CO2(v31), CO2(v32) CO2(v31), CO2(v32), CO2(v33) . . . CO2(v320) symmetric modes, which are considered very fast (see section 5.4). The major differ- ence between the reaction kinetic scheme used here and one by Kozák et al is that in this model the main loss channel of vibrationally excited molecules is VT relaxation along the asymmetric mode while in their model it is to the symmetric modes. 5.8 Studies Using the reaction kinetics model described in section 5.7 and the fluid model described in chapter 4, two types of studies were performed in this work. The geometry of the DBD reactor and the boundary conditions for which calculations are performed remain same as in the case of chapter 4. The first study, study A, includes only 10 vibrational levels (species 6-15 in table 4.1). This study is used to understand the interaction of electrons with vibrationally excited species. In study A, the same standard condition as in the chapter 4, namely frequency of 130 kHz, 1000 mbar, 10 kV amplitude applied voltage, 400 K gas temperature and 3.8 relative permittivity representative of quartz is used. Total number of cycles for which the calculation has been done is kept constant at 20 cycles (0.153 ms). The major deviation from the standard condition is that instead of maintaining a continuous applied voltage the plasma is switched off after 10 cycles to distinguish between the role of electron collisions (initial excitation) and heavy particle collisions (VV transfer). This is a purely hypothetical scenario as the vibrational excita- tion to higher states should be present in reality. However, we use this case to understand how the vibrational excitation is dependent on the discharge parameters. The second study, study B, in addition to the ten species included in the first study includes all the levels of asymmetric mode up to dissociation limit (species 16-33 in table 4.1). For this study, apart from studying the effect of a continuous applied voltage ( the standard condition of chapter 4), different number of on-cycles (while keeping the total number of cycles under study constant at 20) were used to understand the contribution from electronic excitation of initial quanta and the pure vibrational exchange process. In 131PDF Image | Understanding CO2 containing non-equilibrium plasmas
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