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

Ananthanarasimhan, J and Rao, L (2022) Influence of flow regime on the decomposition of diluted methane in a nitrogen rotating gliding arc. In: Scientific Reports, 12 (1).

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Official URL: https://doi.org/10.1038/s41598-022-14435-z


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 (5→50SLPM), operation mode transitioned from glow to spark type; the average electric field, gas temperature, and electron temperature raised (106→156V·mm-1, 3681→3911K, and 1.62→2.12eV). The decomposition’s energy efficiency (ηE) increased by a factor of 3.9 (16.1→61.9gCH4·kWh-1). The first three dominant methane consumption reactions (MCR) for both the flow regimes were induced by H , CH, and CH 3 (key-species), yet differed by their contribution values. The MCR rate increased by 80–148% [induced by e and singlet—N 2], and decreased by 34–93% [CH, CH 3, triplet—N 2], 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 ηE 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.

Item Type: Journal Article
Publication: Scientific Reports
Publisher: Nature Research
Additional Information: The copyright for this article belongs to the Authors.
Department/Centre: Division of Mechanical Sciences > Centre for Sustainable Technologies (formerly ASTRA)
Date Deposited: 26 Jul 2022 05:19
Last Modified: 26 Jul 2022 05:19
URI: https://eprints.iisc.ac.in/id/eprint/74983

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