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Density and surface tension of water + ethylene glycol mixtures as key components of heat transfer liquids.

Author(s) : VINS V., SOUCKOVA M., PROKOPOVA O., CENSKY M., HRUBÝ J., BLAHUT A.

Type of article: IJR article

Summary

Mixtures of water and ethylene glycol form the basis of many important heat transfer fluids widely used in refrigeration, automotive and other thermal management applications. In this work, new accurate density and surface tension experimental data at 0.1 MPa for water + ethylene glycol mixtures were obtained over the entire composition range. Complementary experimental techniques were employed, including the vibrating tube densimeter and the single sinker buoyancy method for the density and the Wilhelmy plate method and the capillary rise technique for the surface tension. By using unique experimental apparatus of own design, the surface tension of the binary mixture was measured for the first time also at temperatures below the equilibrium freezing point, i.e. under the supercooled metastable state. The temperature trend of water + ethylene glycol surface tension does not indicate any anomaly down to 243 K on the contrary to pure water (Vinš et al., 2020, J. Phys. Chem. Lett. 11, 4443). Based on new measurements and literature data, new correlations were developed for density and surface tension both for pure ethylene glycol and the water + ethylene glycol mixture. The Rackett-type correlation represents the saturated liquid density in the temperature range from 260 K up to the critical point of 719 K. A modified Redlich–Kister correlation of the excess molar volume can be used for the calculation of mixture density over the full composition range at temperatures from 240 K to 380 K. A new correlation has been developed for the surface tension of pure ethylene glycol by considering the universal critical exponent , guaranteeing physically correct temperature trend in the vicinity of the critical point. The models by Connors and Wright (1989, Anal. Chem. 61, 194) and Wang et al. (2011, Ind. Eng. Chem. Res. 50, 4086) were slightly readjusted and found to give comparably good predictions for the surface tension of water + ethylene glycol mixture.

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Pages: 191-200

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Details

  • Original title: Density and surface tension of water + ethylene glycol mixtures as key components of heat transfer liquids.
  • Record ID : 30033552
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 171
  • Publication date: 2025/03
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2025.01.004

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