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Thermal Conductivity and Thermal Diffusivity of Sixteen Isomers of Alkanes:  CnH2n+2 (n = 6 to 8)

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National Metrology Institute of Japan, AIST 1-4, Umezono 1-chome, Tsukuba, Ibaraki 305-8563, Japan
Cite this: J. Chem. Eng. Data 2003, 48, 1, 124–136
Publication Date (Web):November 2, 2002
https://doi.org/10.1021/je020125e
Copyright © 2003 American Chemical Society

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    Abstract

    Experimental values of the thermal conductivity λ and thermal diffusivity κ of sixteen pure branched alkanes (CnH2n+2; n = 6 to 8) are presented in the temperature range −15 °C to 70 °C under atmospheric or saturation pressure. Measurements were made with the transient hot-wire method, and in the analysis, the temperatures Tλ and Tκ (associated with both λ and κ) were used. The thermal diffusivity values are corrected by the factors kf (=1.0076 to 0.9892), which are determined by reference to the heat capacity (at 298.15 K) of heptane as a reference material, for data sets obtained with different configurations of the experiments. Heat capacities [volumic, cpρ; specific, cp; and molar, Cm,p] are derived from the relationship cpρ = λ/κ, with values for the density and the molar mass. The relevance of these thermal properties to the boiling point, density, molar density, and velocity-of-sound is examined, together with the results of normal alkanes (n = 6 to 8) and isopentane. The uncertainty of the data is estimated to be 0.4% for the thermal conductivity (absolutely measured) and about 1.8% for the thermal diffusivity (with a coverage factor kp = 2; p = 95%), although that of λ (not for κ) is possibly inferior for a few substances containing a little larger impurity (i.e. mainly other isomers).

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