Abstract
1,2-Ethanediol, 1,2-propanediol and their aqueous solutions are widely used as heat transfer fluids. Their thermal conductivity is a vital physical property, yet there are only few reports in literature. In this paper, thermal conductivity of binary aqueous solutions of the two glycols was measured using the transient hot wire method at temperature from 253.15 K to 373.15 K at atmospheric pressure. Measurement was made for six compositions over the entire concentration range from 0 mol to 1 mol fraction of glycol, namely, 0.0 mol, 0.2 mol, 0.4 mol, 0.6 mol, 0.8 mol, and 1.0 mol fraction of glycol. The uncertainties of temperature and concentration measurement were estimated to be 0.01 K and 0.1 %, respectively. The combined expanded uncertainty of thermal conductivity with a level of confidence of 0.95 (k = 2) was 2 %. The second-order Scheffé polynomial was used to correlate the temperature and composition dependence of the experimental thermal conductivity, which was found to be in good agreement with the experiment data from the present work and other reports.
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Deng, C., Zhang, K. Thermal Conductivity of 1,2-Ethanediol and 1,2-Propanediol Binary Aqueous Solutions at Temperature from 253 K to 373 K. Int J Thermophys 42, 81 (2021). https://doi.org/10.1007/s10765-021-02837-6
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DOI: https://doi.org/10.1007/s10765-021-02837-6