TRANSPORT PROPERTIES IN HIGH POWER ARCS.
Abstract
Improved measurements of the E(I)-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 G(T), the heat flux potential S(T) and the thermal conductivity K(T) 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 G(T), K(T) and u(I,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 G(T), K(T) 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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 21, 1969
- Accession Number
- AD0689277
Entities
People
- Heinz Maecker