Estimation of electron density and temperature in an argon rotating gliding arc using optical and electrical measurements

Ananthanarasimhan, J and Gangwar, RK and Leelesh, P and Srikar, PSNSR and Shivapuji, AM and Rao, L (2021) Estimation of electron density and temperature in an argon rotating gliding arc using optical and electrical measurements. In: Journal of Applied Physics, 129 (22).

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Abstract

This work reports average electron temperature (T e) and electron density (n e) of an atmospheric argon rotating gliding arc (R G A), operated in glow-type mode, under transitional and turbulent flows. Both T e and n e were calculated near the shortest (δ) and longest (�) gap between the electrodes, by two different methods using two separate measurements: (1) optical emission spectroscopy (O E S) and (2) physical-electrical. T e calculated from (a) collisional radiative model (C R M) (O E S) and (b) BOLSIG+ physical-electrical, reduced electric field (E N o) as input, differed each other by 16%-26% at δ and 6% at �. T e was maximum at δ (> - > 2 eV) and minimum near � (1.6-1.7 eV). Similarly, the E N o was maximum near the δ (5-8 Td) and minimum near �, reaching an asymptotic value (1 Td). By benchmarking T e from C R M, the expected E N o near δ was corrected to 3 Td. The calculated C R M intensity agreed well with that of the measured for most of the emission lines indicating a well optimized model. The average n e near δ and � from Stark broadening (O E S) was 4.8- 8.0 � 10 21 m - 3, which is an order higher than the n e calculated through current density (physical-electrical). T e and n e were not affected by gas flow, attributed to the glow-type mode operation. To the best of authors' knowledge, this work reports for the first time (a) an optimized C R M for R G As (fine-structure resolved), (b) the poly-diagnostic approach to estimate plasma parameters, and (c) the validation of E N o calculated using physical-electrical measurements. © 2021 Author(s).

Item Type:	Journal Article
Publication:	Journal of Applied Physics
Publisher:	American Institute of Physics Inc.
Additional Information:	The copyright for this article belongs to American Institute of Physics
Keywords:	Argon; Electric arcs; Electron density measurement; Electron temperature; Flow of gases; Optical emission spectroscopy, Asymptotic values; Atmospheric argon; Collisional radiative model; Diagnostic approach; Electrical measurement; Optimized models; Plasma parameter; Stark broadenings, Electric variables measurement
Department/Centre:	Division of Mechanical Sciences > Centre for Sustainable Technologies (formerly ASTRA)
Date Deposited:	02 Aug 2021 10:47
Last Modified:	02 Aug 2021 10:47
URI:	http://eprints.iisc.ac.in/id/eprint/69007

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