Estimation of electron density and temperature in an argon rotating gliding arc using optical and electrical measurements
| Autor: | Lakshminarayana Rao, Psnsr Srikar, P. Leelesh, Anand M. Shivapuji, R. K. Gangwar, Ananthanarasimhan J |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Physics Electron density Argon Plasma parameters Analytical chemistry General Physics and Astronomy chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences symbols.namesake Stark effect chemistry 0103 physical sciences symbols Electron temperature Electrical measurements Emission spectrum 0210 nano-technology Current density |
| Zdroj: | Journal of Applied Physics. 129:223301 |
| ISSN: | 1089-7550 0021-8979 |
| Popis: | 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 ( Δ) 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 Δ. T e was maximum at δ ( > 2 eV) and minimum near Δ (1.6–1.7 eV). Similarly, the E N o was maximum near the δ (5–8 Td) and minimum near Δ, 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 Δ 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. |
| Databáze: | OpenAIRE |
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