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176 to industrial sizes. Two peculiar trends have been observed, by others, in CO2 con- version to CO in a DBD: Firstly, a power-law relation between conversion degree and specific energy input, which is a measure of energy density; Secondly, this power-law, to a first degree remains the same for any combination of operational parameters. In this work, the scaling of conversion degree with energy density has been extended up to a single filament, using a pin-pin reactor. By counting the number of filaments at various conditions, a similar power-law to that of one observed between conversion degree and energy density has been shown to exist between the filament density and power absorbed by the plasma. By correlating the transported charge from the filaments and by fast imaging of filaments, it has been shown that the uneven surface charge distributions, modulated by filament density results in a power-law relation between filament density and energy consumed. A simple model is developed, to connect CO2 conversion and the number of filaments per time-period. From this, it has been shown that at least a part of the reason for the observed power-law between CO2 conversion and energy density should be ascribed to difficulty in creating subsequent filaments in a given half cycle. How- ever, the volume and time dependent variation in CO production is shown to hold the key to explain the observed unique conversion for unique energy density. To simulate the volume and spatial variation of CO production rates, a fluid model is set up by considering various electron induced processes, such as ionization, at- tachment etc., in pure CO2 plasmas. In addition to the ground state molecules, few vibrationally excited molecules have been considered. Using this model, the single most dominant production mechanism has been attributed to electron impact dis- sociation, while minor but equal contributions have been ascribed to ion-electron recombination and dissociative electron attachment (up to 10% each). It has also been shown that CO production scales with energy density, irrespective of the man- ner in which the energy density has been arrived at. Also, for a given residence time, the specific energy input calculated by the model has been shown to be equal to that measured in the experiments. Another important and required channel for high energy efficiency in CO2 disso- ciation is the so called vibrational transfer along CO2 asymmetric mode. Using the fluid model, two hypothetical studies were performed. In the first study, per- formed to understand gain and loss process of first vibrational level of the asym- metric mode, both electron impact excitation from the ground state and the electron impact de-excitation from the second level have been shown to be important pro- SummaryPDF Image | Understanding CO2 containing non-equilibrium plasmas
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