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5.9. RESULTS & DISCUSSION Table 5.2: Conditions used for calculations in Study B Pressure (mbar) tplasma(ms) [Number of cycles voltage-on] 1000, 800, 600 0.077 [10], 0.115 [15], 0.153 [20] the off-phase, plasma does not consume any power, however, the excited species pro- duced during on-phase still continue to be active and undergo reactions. For maximum energy efficiency it is desired that the active species produce desired products without being lost from undesired reactions. There are process designs which separate the vibrational energy creation in active part and vibrational energy exchange (e.g. DBD plasma jet). The pulsed model introduced here can be used to simulate such designs. In study B, apart from the number of on-cycles pressure is also varied to calculate the vibrational distributions in asymmetric mode. The reasoning for choosing these two parameters as variables as follows. Pressure influences vibrational distribution in two ways: First by affecting the power coupled into plasma (with higher pressures more power) determing the creation of seed states (CO2(v31) and CO2(v32)), when the voltage is still on, and secondly by determining the VV transfer rates (via number densities of active species). tplasma influences the distribution by determining the amount of energy coupled into plasma. In order to understand their effect, a series of calculations at different pressures and tplasma have been performed; parameters for different calculations for study B are listed in table 5.2. The results of study A and study B will be discussed in detail section 5.9.2 and section 5.9.3 respectively. It has to be noted that the discharge behavior does not show any difference if species CO2(v33) – CO2(v320) are included or not as they do not interact with electrons (i.e. there is no difference, in discharge behavior, between the two studies). 5.9 Results & Discussion Since the electrons are required to populate the first few vibrational levels, it is important to know the range of mean electron energy in which vibrational excitation from elec- tron impact becomes important. From the fractional power transferred diagram plotted in chapter 4 (as reproduced here in figure 5.6 ), it can be seen that the vibrational excit- ation is dominant at lower mean electron energies; Up to 50% of electron energy can be coupled into CO2(v31). At the same time the amount of energy transferred to CO2(v32) by electron impact excitation is about two orders of magnitude smaller than energy trans- 132PDF Image | Understanding CO2 containing non-equilibrium plasmas
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