Accession Number:

AD0621213

Title:

AN EXPERIMENTAL DETERMINATION OF THE THERMAL AND ELECTRICAL CONDUCTIVITY OF ATMOSPHERIC ARGON PLASMA,

Descriptive Note:

Corporate Author:

NORTHWESTERN UNIV EVANSTON ILL GAS DYNAMICS LAB

Personal Author(s):

Report Date:

1965-01-01

Pagination or Media Count:

212.0

Abstract:

A wall stabilized arc was used to produce an equilibrium, cylindrically symmetric, argon plasma column. It was demonstrated that axial temperature gradients are negligible over a significant length of the plasma column, thus verifying the assumption that, at low flow rates, convective heat losses are not important for this type of device. The radial temperature distribution within the arc column was ascertained by spectroscopic analysis for arc currents of 30 to 60 amperes. Temperatures obtained from absolute line and absolute continuum radiation were in excellent agreement. An empirical expression, based upon the Kramers-Unsold theoretical model, was obtained for the radiated power, as a function of temperature, of argon plasma. The electrical conductivity of argon was calculated using Spitzers electron-electron collision correction. A technique was developed to determine the electrical conductivity from the arc currents, voltage gradients and the measured temperature profiles. Using this technique, the electrical conductivity of argon plasma as a function of temperature was determined for the temperature range of 8,500 K to 12,000 K. The experimental electrical conductivity showed good agreement with the calculated electrical conductivity. Using the measured temperature profiles, calculated radiated power, and experimentally verified electrical conductivity, the thermal conductivity of argon was determined for the same temperature range as the electrical conductivity. The data were in good agreement with theoretically predicted results. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE