Comparison between electropositive and electronegative cold atmospheric-pressure plasmas: a modelling study
| Autor: | Mingzhe Rong, Jia Feng Li, Aijun Yang, Michael G. Kong, Dingxin Liu, Xiaohua Wang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Electron density
plasma density electron temperature lcsh:QC501-721 Energy Engineering and Power Technology chemistry.chemical_element Electron helium 01 natural sciences 010305 fluids & plasmas O(2) Electronegativity ion density Physics::Plasma Physics discharge characteristics Electric field 0103 physical sciences lcsh:Electricity sheath boundary electron generation rate distributions neon spatiotemporal phenomena pressure 1 atm Electrical and Electronic Engineering electron density electropositive cold atmospheric-pressure plasmas plasma temperature electronegative cold atmospheric-pressure plasmas Helium 010302 applied physics Atmospheric pressure He ion-coupling power plasma impurity fraction Plasma N(2) electronegativity plasma transport processes electric field chemistry Physics::Space Physics spatiotemporal distributions Electron temperature lcsh:Electrical engineering. Electronics. Nuclear engineering Atomic physics plasma impurities oxygen lcsh:TK1-9971 plasma sheaths |
| Zdroj: | High Voltage (2016) BASE-Bielefeld Academic Search Engine |
| DOI: | 10.1049/hve.2016.0019 |
| Popis: | Cold atmospheric-pressure He + N(2) and He + O(2) plasmas are chosen as the representatives for electropositive and electronegative plasmas, of which the discharge characteristics are studied and then compared to each other by fluid models. As the increase of the impurity (N(2) or O(2)) fraction from 0 to 10%, for He + N(2) plasmas the electron density and ion density increase, the spatiotemporal distributions of electron density, ion density, electron temperature and electron generation rate change a little. On contrast, for He + O(2) plasmas the electron density decreases, the ion density first increases and then decreases, the electron temperature increases in the bulk region, but decreases in the sheath region, and the plasmas transform from γ mode to α mode as the significant change of electron generation rate distributions. Larger electric field is needed in the bulk region to sustain the electronegative plasma, so the electrical characteristics of He + O(2) plasmas transform form capacitive to resistive with increasing O(2) fraction. Meanwhile, the ion-coupling power increases dramatically, which can be estimated by a formula based on the electronegativity. A new criterion for determining the sheath boundary, |∇E| = 5 kV/cm^2, is put forward, which is found suitable for both the electropositive and electronegative plasmas. |
| Databáze: | OpenAIRE |
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