Modeling of a Glow Discharge

Vriens, L.; Smeets, A.H.M.; Cornelissen, Hugo J.

doi:10.1007/978-1-4615-9311-9_2

Cited by 2 publications

(1 citation statement)

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“…(5). The electric eld at the cathode is E w » D Á w =¸D, where the cathode fall is given by 16 Figure 8b shows the calculated thermionic current density. The average thermionic current is 433 A/m 2 when summed over the entire cathode surface.…”

Section: Fig 6 Convection Effects On Cathode Temperature: A) Nitrogementioning

confidence: 99%

Plasma Study on Ionization of Flowing Gases by Direct Current Electric Discharge

Deaconu

Coleman

2003

AIAA Journal

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A new design of a corona/thermionic-arc discharge ionization device was investigated experimentally. The device features a hollow (spiral lament) cathode-plane anode con guration and creates a negative point to plane corona discharge, which ionizes a owing gas column.Multiple experimental runs have been performed in nitrogen, helium, and argon. The diagnostics of the plasma consisted of electron temperature, electron density, gas pressure, and cathode/gas temperature. The measurements show that the discharge plasma and the plume are in local thermal nonequilibrium,with typical electron temperatures being one order of magnitude higher than the gas temperature. The experimental plasma data and the analysis of the experimental results are presented. The analysis focuses on the comparison of the experimental data with the charge-drift theory of the corona discharge and on identifying the stabilizing factors of the discharge. Finally, an approximate predictive model for the electron density in the plume is proposed. Nomenclature c = sound speed, (°RT) 1=2 c e = electron mean thermal speed, (8k b T e =¼m e / 1=2 c p = heat capacity E N , E = vector electric eld e = electron charge I = current j = current density k b = Boltzmann's constant M = Mach number, u=c m e = electron mass m i= ion mass m s = mass of gas particle n e = electron density n s = gas density p = pressure Q es = electron collision cross section R = gas constant T , T i = gas/ion temperature T e = electron temperature u = gas speed V = voltage N v, v = particle velocity W = electric power ® = Townsend ionization coef cient°= gas speci c heat ratio " 0 = electrical permittivity of vacuum D = debye shielding length ¹ e , ¹ i = electron/ion mobility º = collision frequency ½ = charge density ½ 1 , ½ 2 = gas density Á = electric potential

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Section: Fig 6 Convection Effects On Cathode Temperature: A) Nitrogementioning

confidence: 99%