Chemical nonequilibrium in a 0.1 bar hydrogen arc

Journal Article · Tue Dec 01 04:00:00 EST 1992 · Bulletin of the American Physical Society

OSTI ID:127925

Eddy, T L ^[1]

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1. Idaho National Engineering Lab., Idaho Falls, ID (United States)

The deviation from local chemical equilibrium (LChE) in a flowing hydrogen arc is evaluated using de Donder`s affinity. Prior measurements of 190 amp hydrogen arc in an arc tunnel at 0.1 bar were evaluated on the basis of thermal nonequilibrium (non-LThE). High power experiments indicated that non-LThE alone is insufficient to describe the states. The affinity is determined from the continuum given N{sub e}. When both non-LChE & non-LThE analyses are applied to the H-arc, T{sub e} is found to be closer to T{sub LTE} from Balmer populations than with non-LThE only. The affinity is found to be about 10% of the ionization energy. In argon plasma jets near 85 kPa, it has been found to be about 25% over various conditions and l20% in Ar/He:2/1 mixtures.

• DOE Contract Number: AC07-76ID01570
• OSTI ID: 127925
• Report Number(s): CONF-920376--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 9 Vol. 37; ISSN 0003-0503; ISSN BAPSA6
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
AFFINITY
ELECTRON TEMPERATURE
HIGH-FREQUENCY DISCHARGES
HYDROGEN
LTE
NON-EQUILIBRIUM PLASMA