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Title: Two-temperature transport coefficients of SF{sub 6}–N{sub 2} plasma

Sulfur hexafluoride (SF{sub 6}) is widely adopted in electric power industry, especially in high-voltage circuit breakers and gas-insulated switchgear. However, the use of SF{sub 6} is limited by its high liquidation temperature and high global warming potential. Recently, research shows SF{sub 6}–N{sub 2} mixture, which shows environmental friendliness and good electrical properties, may be a feasible substitute for pure SF{sub 6}. This paper is devoted to the calculation of and transport coefficients of SF{sub 6}–N{sub 2} mixture under both LTE (local thermodynamic equilibrium) and non-LTE condition. The two–temperature mass action law was used to determine the composition. The transport coefficients were calculated by classical Chapman–Enskog method simplified by Devoto. The thermophysical properties are presented for electron temperatures of 300–40 000 K, ratios of electron to heavy species temperature of 1–10 and N{sub 2} mole fraction of 0%–100% at atmospheric pressure. The ionization processes under both LTE and non-LTE have been discussed. The results show that deviations from local thermodynamic equilibrium significantly affect the properties of SF{sub 6}–N{sub 2} plasma, especially before the plasma is fully ionized. The different influence of N{sub 2} on properties for SF{sub 6}–N{sub 2} plasma in and out of LTE has been found. The results will serve asmore » reliable reference data for computational simulation of the behavior of SF{sub 6}–N{sub 2} plasmas.« less
Authors:
; ; ; ;  [1] ; ;  [2]
  1. State Key Laboratory of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049 (China)
  2. Electric Power Research Institute of State Grid Shaanxi Electric Power Company, Xian (China)
Publication Date:
OSTI Identifier:
22486477
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 10; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ATMOSPHERIC PRESSURE; CIRCUIT BREAKERS; COMPUTERIZED SIMULATION; ELECTRIC POTENTIAL; ELECTRIC POWER INDUSTRY; ELECTRICAL PROPERTIES; ELECTRON TEMPERATURE; LTE; MIXTURES; NITROGEN; PLASMA; SULFUR FLUORIDES; TEMPERATURE RANGE OVER 4000 K