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Thermal Conductivity of Aqueous CaCl2 Solutions at High Temperatures and High Pressures

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Abstract

The thermal conductivities of four aqueous CaCl2 solutions of (5, 10, 15, and 20) mass% have been measured with a coaxial-cylinder (steady-state) technique. Measurements were performed in the temperature range from (293.15 to 573.15) K and at pressures up to 40 MPa. The expanded uncertainty of thermal conductivity, pressure, temperature, and concentration measurements at the 95 % confidence level with a coverage factor of k = 2 were estimated to be 2, 0.05 %, 30 mK, and 0.01 %, respectively. Isobaric temperature maxima of the measured thermal conductivities are found around 423 K. Existing thermal conductivity correlation models for aqueous salt solutions were examined using the measured results for CaCl2(aq). The measured thermal conductivity data are also compared with the reported data and the values calculated from various prediction techniques. The agreement between measured and predicted values of the thermal conductivity of CaCl2(aq) is within 0.3 %. A wide-ranging correlation model was developed using the measured thermal conductivity data and the new IAPWS formulation for the thermal conductivity of pure water. The average absolute deviation between the measured and calculated values of thermal conductivity is 0.21 %.

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Acknowledgments

Abdulagatov I.M. thanks the Applied Chemicals and Materials Division at the National Institute of Standards and Technology for the opportunity to work as a Guest Researcher at NIST during the course of this research.

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  1. Ilmutdin M. Abdulagatov

    Present address: Applied Chemicals and Materials, National Institute of Standards and Technology, 325 Broadway, Boulder, CO, 80305, USA

Authors and Affiliations

  1. Department of Industrial Ecology and Industrial Safety Properties of Aqueous Systems, Azerbaijan Technical University, Baku, Azerbaijan

    Lala A. Akhmedova-Azizova

  2. Geothermal Research Institute of the Dagestan Scientific Center of the Russian Academy of Sciences, Shamilya Str. 39-A, Makhachkala, 367003, Dagestan, Russia

    Ilmutdin M. Abdulagatov

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Akhmedova-Azizova, L.A., Abdulagatov, I.M. Thermal Conductivity of Aqueous CaCl2 Solutions at High Temperatures and High Pressures. J Solution Chem 43, 421–444 (2014). https://doi.org/10.1007/s10953-014-0141-z

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