鉄蒸気の混入したアルゴンの輸送特性

Abstract

Compared with the conventional combustion, thermal plasma technology offers particular advantages for industrial heating and opens new applications. In order to support these applications theoretically, fundamental propeties of plasma are needed. So electrical and thermal conductivities of different compositions of the argon-iron mixture gases used in plasma torches have been calculated. The method we used was derived from Chapmann-Enskog's. Calculations were made for temperature between 2, 500-30, 000K and for pressure between 1-20atm assuming the hypothesis of local thermodynamic equilibrium. In the case of the pure argon, our results show good agreement with other experimental and calculated values. The effects of iron vapor and pressure on transport properties were clarified. Main results are as follows:(1) Admixture of iron vapor causes the transport properties to increase in lower temperatures and to decrease in higher temperatures; this results from the lower ionization potentials of iron atoms and ions compared with those of argon atoms and ions.(2) Increase of pressure causes the transport properties to decrease in lower temperatures and to increase in higher temperatures; this results from the upward shift of the temperature region in which the ionization reactions proceed efficiently.