Thermal Conductivity Measurement in High Temperature Argon by the Shock Perturbation and Mach Reflection Methods,
WISCONSIN UNIV-MADISON DEPT OF MECHANICAL ENGINEERING
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Two methods of thermal conductivity measurement have been developed and applied to argon in the range from 3000 to 5400 K. The shock perturbation method SPM employs a set of small carefully spaced grooves in the wall of the shock duct. The resulting weak acoustic disturbances generate a set of weak thermal or entropy waves behind the shock which decay with time. Schlieren-photodiode detection and rapid transient digital storage of the signals permit the decay of these waves to be analyzed to yield the thermal shock impinges on a small angle ramp. High speed 10 ns interferograms of the resulting tangential thermal and vorticity diffusion zone permit the conductivity to be calculated from the relevant compressible flow equations in which use is made of the Illingworth variable.