The MTE continuum relation with application to an argon arc at atmospheric pressure |
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Authors: | TL Eddy CJ Cremers HS Hsia |
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Institution: | Mechanical Engineering Department, West Virginia Tech., Montgomery, W. VA 25136, U.S.A.;Mechanical Engineering Department, University of Kentucky, Lexington, KY 40506, U.S.A. |
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Abstract: | The continuum emission coefficient relation for a plasma in Multithermal Equilibrium (MTE) is derived using the partial-MTE ionization equation. The results are presented in a form using the nonhydrogenic free-bound Gaunt factors of Schlüter. Measurements on a 200 A, 1 atm, constricted argon arc indicate that electron densities calculated from the MTE continuum relation and Schlüter's ξfb values exceed electron densities from the Stark broadening of Hβ by 15–30%. Experimental values of ξfb are up to 3 times larger than Schlüter's values, but are in agreement with the values of Morris and Krey at 5 atm, which is probably one of the few similar experiments actually in or near complete LTE. In the present experiment at the arc axis: Ne(Hβ) = 1.00 × 1017cm-3 (±8%); Te = 34,000 K (±20%); Texa = 12,000 K (±3%); Texβ = 9000 K (±5%); and Ta = Ti = 10,000 K (±68%). The probable errors reflect the need for more accurate transition probabilities which had an uncertainty of 25%. |
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