TRANSPORT PROPERTIES IN HIGH POWER ARCS.
Interim scientific rept. 1 Feb 67-31 Dec 68,
TECHNISCHE HOCHSCHULE MUNICH (WEST GERMANY) ELEKTROPHYSIKALISCHES INSTITUT
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Improved measurements of the EI-characteristics for H2 and N2 as well as of the radial temperature distributions up to 26,000K for N2 are accomplished. Together with the already measured temperature distributions in H2 a set of experimental results suitable for the determination of material functions is available now. For H2 a computer program is developed to evaluate the electrical conductivity GT, the heat flux potential ST and the thermal conductivity KT by an iteration method. The final results for these material functions up to 26,000K are given. In the case of N2 the energy transport by radiation which is partially reabsorbed within the arc, becomes dominant above 10,000K. Therefore, special methods are applied to determine GT, KT and uI,T, the differences between emitted and absorbed radiative power per unit volume, up to 26,000K. For Ar computations are made starting from theoretical values of the material functions GT, KT and the coefficients of emission and absorption to determine the radiative behaviour of an Argon arc at 1 atm pressure with a channel diameter of 5mm up to 16,000K. The influence of different assumptions in the theory of emission and the absorption of radiation within the arc are discussed. Author
- Plasma Physics and Magnetohydrodynamics