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4.2. DETAILS OF THE MODEL 4. FLUID MODELLING OF CO2 DISSOCIATION observed trends for similar experimental conditions. In the previous chapter f (Pavg ) has been introduced as a proxy to the relation between energy consumed in CO2 dissociation and CO produced; it is also mentioned that for an unique f(Pavg), there is an unique conversion, here in this chapter the reasons for such a dependence on time and spatial evolving production rate will be discussed. A time-dependent, spatially one-dimensional fluid model taking into account an extended vibrational kinetics of CO2 is employed. The fluid model is applied to characterize the spatiotemporal behaviour of discharges taking place in the DBD arrangement under consideration with special focus on the electrical discharge characteristics and the mechanisms of the CO2 dissociation. In addition, mod- elling results for a large range of operational parameters are utilized to analyse the CO2 conversion and energy efficiency and their relation to the specific energy input. 4.2 Details of the model The modelling studies presented in this chapter are related to the geometrically symmet- ric DBD built in a flow reactor configuration used in [60]. A schematic representation of this plasma reactor is shown in figure 4.1a. It consists of a tube that directs the gas flow into the gap between two planar electrodes which form the active zone. The active zone of the DBD is seamlessly connected with another tube which is used to pump out the gas that has been processed between the dielectrics. The reactor configuration is optimized for different experimental diagnostics as e.g. measurement of the CO produced. Several flow tube reactors with thicknesses ∆ of the dielectric barriers between 1 and 2 mm and a constant gap width of 1 mm were used in the experiments. Further details are given in [60]. a) ∆∆ x x=0 x=d powered grounded b) electrode electrode Figure 4.1: Schematic of the flow reactor geometry used in [60] (a) and the spa- tially one-dimensional discharge geometry (b) with gap width d and thickness of dielectric layer ∆. 79PDF Image | Understanding CO2 containing non-equilibrium plasmas
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