Thermophysical properties of (diphenyl ether + biphenyl) mixtures for their use as heat transfer fluids

https://doi.org/10.1016/j.jct.2012.02.001Get rights and content

Abstract

Experimental measurements of density, viscosity and thermal conductivity are reported for pure diphenyl ether and three different binary mixtures of diphenyl ether and biphenyl including the eutectic point. Density has been measured for the liquid phase at temperatures ranging from (298.15 to 363.15) K and for pressures up to 45 MPa using a high-pressure vibrating tube densimeter. A Tammann–Tait correlation of the experimental densities has been proposed for each composition. From these correlations, isothermal compressibility, isobaric thermal expansivity and internal pressure have been determined. Moreover, viscosity and thermal conductivity were experimentally determined at atmospheric pressure for several temperatures by using a rolling ball viscometer and a device based in the hot-wire technique, respectively. All the experimental devices used to determine the thermophysical properties were checked finding good agreements with previous literature data. The experimental viscosity values were correlated using the Vogel–Fulcher–Tammann, Avramov–Milchev and MYEGA equation.

Highlights

► Densities at high pressure of mixtures of diphenyl ether and biphenyl were reported. ► The composition dependence on thermal conductivity and viscosity is very smooth. ► Crossing point in αp isotherms were detected around 38 MPa. ► MYEGA reproduces our experimental η(T) curves with deviations lower than 0.24%. ► The experimental devices were checked obtaining good agreements with literature.

Section snippets

Introduction and background

The form and quantity in which the energetic requirements are satisfied present important implications of social and economical order. The dependence on fossil fuels has increased in the industrialized countries during the last decades. In 2010, they represented more than 81% of the worldwide energy consumption [1]. Unfortunately, these resources are consumed faster than they are replaced and their reserves are very limited [2]. The transformation and consumption of energy result also in an

Materials

Toluene, CAS 108-88-3, with a mass fraction purity of 0.998 (0.9994 by gas chromatographic, GC, analysis, value provided by the manufacturer), n-Octane, CAS 111-65-9, 0.99 (0.994 by GC), n-Decane, CAS 124-18-5, 0.99 (0.997 by GC), n-Dodecane, CAS 112-40-3, 99% (99.52% by GC), Diphenyl Ether, CAS 101-84-8, 0.99 (0.999 by GC), and Biphenyl, CAS 92-52-4, with a mass purity of 0.99 (0.999 by GC provided by the manufacturer) were purchased from Aldrich. Table 1 summarizes the purities of these

Densities

The experimental densities in the liquid phase [29] for three mixtures of {x diphenyl ether and + (1  x) biphenyl} and pure diphenyl ether at temperatures up to 363.15 K and pressures up to 45 MPa are given in table 2. The density values range from (0.9971 to 1.0902) g · cm−3, and in figures 3a and b it can be seen that ρ increases with pressure for T = 313.15 K and decreases with increasing temperature for p = 15 MPa, as an example. These data were correlated for each mole fraction by the following

Conclusions

The experimental tests carried out have been checked obtaining very good agreements with literature values for toluene. New experimental values of density, viscosity and thermal conductivity for different mixtures of diphenyl ether and biphenyl have been determined including the eutectic mixture. It has been determined the increase in density due to the pressure and its decrease due to the temperature. It was found that density rises with the concentration of the diphenyl ether. The viscosity

Acknowledgments

This work was supported by the Fundación Iberdrola, Ramón y Cajal Grant Program from the Ministerio de Ciencia e Innovación (Spain) and the Universidade de Vigo. The authors also acknowledge Xunta de Galicia (Spain) for financial support through the Project PGIDIT07PXIB314181PR.

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