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The thermal conductivity of gases: Incorrect results due to desorbed air

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Abstract

Air desorbed from the measuring instrument can falsify the thermal conductivity of a gas measured by steady-state methods. For a guarded hot-plate apparatus the contamination effect was determined to depend on both the residence time in the system and the temperature. The investigation covered the gases H2, He, Ne, CH4, N2, air, Ar, and Kr. For gases whose conductivity is better than that of air (H2, He) the measured values are too small, and for gases of poorer conductivity they are too high. Corrections for the effect of impurity have been applied to the measurements presented. These impurity corrections are considerably larger than the precision of the measurements, but they are of the order of the estimated overall uncertainty of the measurements. The departures between the corrected thermal conductivities reported here and values taken from the correlations in the literature run up to 5 % at the highest temperatures.

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  1. Physikalisch-Technische Bundesanstalt, Braunschweig, Germany

    W. Hemminger

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  1. W. Hemminger
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Hemminger, W. The thermal conductivity of gases: Incorrect results due to desorbed air. Int J Thermophys 8, 317–333 (1987). https://doi.org/10.1007/BF00503945

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  • DOI: https://doi.org/10.1007/BF00503945

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