Influence of flow regime on the decomposition of diluted methane in a nitrogen rotating gliding arc.

This work reports the operation of rotating gliding arc (RGA) reactor at a high flow rate and the effect of flow regimes on its chemical performance, which is not explored much. When the flow regime was changed from transitional to turbulent flow ([Formula: see text]), operation mode transitioned from glow to spark type; the average electric field, gas temperature, and electron temperature raised ([Formula: see text], [Formula: see text], and [Formula: see text]). The decomposition's energy efficiency ([Formula: see text]) increased by a factor of 3.9 ([Formula: see text]). The first three dominant methane consumption reactions (MCR) for both the flow regimes were induced by [Formula: see text], CH, and [Formula: see text] (key-species), yet differed by their contribution values. The MCR rate increased by 80-148% [induced by e and singlet-[Formula: see text]], and decreased by 34-93% [CH, [Formula: see text], triplet-[Formula: see text]], due to turbulence. The electron-impact processes generated atleast 50% more of key-species and metastables for every 100 eV of input energy, explaining the increased [Formula: see text] at turbulent flow. So, flow regime influences the plasma chemistry and characteristics through flow rate. The reported RGA reactor is promising to mitigate the fugitive hydrocarbon emissions energy efficiently at a large scale, requiring some optimization to improve conversion.

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