An Accurate Determination of the Thermal Conductivity of Argon at High Temperatures,
TECHNISCHE HOGESCHOOL EINDHOVEN (NETHERLANDS) LAB FOR FLUID DYNAMICS AND HEAT TRANSFER
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A method is described to obtain the thermal conductivity of a gas from laser-schlieren measurements of the density gradient in the end-wall thermal boundary layer of a shock tube. The pressure increase after shock reflection is taken into account. Attention is given to the contribution of higher order derivatives of the refractive index to the schlieren signal. Data on the thermal conductivity of argon are presented for temperatures from 1500-2100 K and from 5000-6500 K. They appear to be about 3 lower than the values based on the intermolecular potential of Aziz and Chen, which is attributed to the influence of side-wall boundary layers.