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4.4. RESULTS AND DISCUSSION 4. FLUID MODELLING OF CO2 DISSOCIATION Table 4.6: Standard condition and parameter variations used for the model cal- culations. Parameter Standard condition Frequency [kHz] 130 Pressure [mbar] 1000 Voltage amplitude [kV] 10.0 Gas temperature [K] 400 Dielectric permittivity 3.8 Parameter variation 60, 90 600, 700, 800, 900 8.0, 8.5, 9.0, 9.5, 10.5, 11.0 300, 350, 450, 500 4.5, 6.0 different experimental conditions studied. Beginning with the standard condition, where the relative permittivity of the dielectric of 3.8 is a representative of quartz , voltage amplitude of 10 kV, frequency of 130 kHz, pressure of 100 mbar and gas temperature of 400 K, usually one parameter is changed for the respective parameter variation while keeping the other parameters constant. The temporal evolution of the applied voltage, the gap voltage and the discharge cur- rent density as well as the spatiotemporal evolution of the electron density, mean elec- tron energy and reduced electric field are shown in figure 4.3. Because already after few cycles a quasi-periodic state establishes for these properties at the discharge conditions considered, here the three cycles 18 to 20 are shown, where the electrical characteristics are identical in every cycle. Since a sinusoidal voltage signal is applied to the electrodes of the DBD, each electrode alternates between being cathode and anode. That is, for half of the period one electrode is the instantaneous cathode (lower voltage compared to the other electrode) and for the next half-period it is the instantaneous anode (higher voltage compared to the other electrode). On basis of this alternating nature of a DBD, another classification is generally made, where a voltage cycle is divided into positive and neg- ative half-cycle. The positive half-cycle takes place when a positive voltage is applied at the powered electrode, while the negative half-cycle occurs when a negative voltage is applied. These classifications are helpful in simplifying the discussion in the following sections. It can be seen from the characteristics of the voltage and discharge current density displayed in figure 4.3a that there is one discharge event every half-cycle. Each peak in 91PDF Image | Understanding CO2 containing non-equilibrium plasmas
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