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principles to determine if the experimentally measured gas temperature resides in the expected range. Equation 6.1 gives the relation between input power and specific enthalpy, assuming constant pressure: P =m ̇∆h=m ̇cp∆Tg (6.1) where P is power, m ̇ is mass flow rate of the Ar/CO2 gas mixture, and h is specific enthalpy, which equals the multiplication of the specific heat capacity (cp) by the change in gas temperature (∆Tg). The specific heat capacity can be calculated using Equation 6.2: γ Ru cp= γ−1 ·M (6.2) where γ = cp/cv (cv is the specific heat capacity assuming constant volume) and M is the molecular weight of the gas species [84]. An average specific heat capacity for the Ar/CO2 gas mixture can be calculated using the following formula: ⟨cp⟩=m ̇ArcpAr +m ̇CO2cpCO2. (6.3) m ̇ Ar + m ̇ CO2 Using Equations 6.1-6.3, an estimated change in temperature can be calculated for a given input power and Ar/CO2 flow rate mixture. For a power range of 1-2 kW and CO2 flow rate range of 1-8 slm with Ar flow rate constant at 8 slm, the estimated change in gas temperature ranges from 2200 - 13100 K. Given this gas temperature estimation, it is plausible that the experimentally measured gas temperature is accurate near 6500 K. Though the temperature results shown in Figure 6.14 indicate weak thermal non- equilibrium between Tel and Tr, the local thermodynamic equilibrium between Tr and Tv can provide some explanation for the lower-than-expected efficiencies of CO2 conversion shown in Figure 6.9. As described in Section 3.2, vibrational excitation 123PDF Image | CO2 Conversion in a Microwave Plasma Catalyst System
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