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Chapter 4 Fluid modelling of CO2 dissociation in a dielectric barrier discharge∗ Abstract Numerical simulations were done, by employing a spatially one-dimensional fluid model, to study the dominant mechanisms behind CO2 splitting in a symmetric dielectric barrier discharge and to explain the scaling of CO2 conversion with specific energy input. Since relatively lower conversions (1-5 %) of CO2 fed into reactor, are reported, a simpler chemical reaction set is considered; it consisted mainly of reactions involving CO2 and twenty eight vibrationally excited CO2 species with electrons and with each other. In addition reactions involving, four other neutrals, seven ions and two electronic states are included. Discharge characteristics, such as power-input, evolution of the electric field, electron energy are evaluated self-consistently at different values of operational parameters; the parameters varied are the amplitude and frequency of applied voltage signal, pressure, temperature and relative permittivity of the dielectrics. The cal- culations predict that an asymmetry arises between half-cycles, which can be attributed to slow recombination of positive ions and consequent difference in electric field between half-cycles. The major contribution to CO production is from electron impact dissoci- ation, and minor, but approximately equal contributions from dissociative recombination ∗this work is done in collaboration with Dr. M. Becker and Priv. -Doz. Dr. Loffhagen of INP Greifswald. Parts of this chapter are submitted for publication as S. Ponduri, M.M. Becker, S. Welzel, M.C.M. van de Sanden, D. Loffhagen and R.Engeln 75PDF Image | Understanding CO2 containing non-equilibrium plasmas
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