Thermal conductivity of carbon dioxide in the temperature range 100°C to 1075°C

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Abstract
The thermal conductivity, k, of carbon dioxide is measured by adopting the conductivity column method in the temperature range 100°c to 1075°c. The measurements are taken at various pressures between 12·5 and 50·5 cm of mercury where the k values are found to be independent of gas pressure. The estimated accuracy of k values is ±2 per cent and these are correlated within an average absolute deviation of 0·5 per cent by the following quadratic polynomial in temperature (T): Here k is in cal cm-1 s-1deg-1 and T in degrees Kelvin. The present measurements agree well with the existing data. However, the latter have a large scatter and consequently the present work helps in resolving some of the controversies faced by correlators of k data. The theoretically calculated k values are appreciably smaller than the experimental results and this disagreement is attributed to a different value for the diffusion coefficient characterizing the transport of internal energy in comparison to the more familiar one associated with the diffusion coefficient measured in a tracer experiment.