Liquid viscosities, excess properties, and viscous flow thermodynamics of triethylene glycol + water mixtures at T = (298.15, 303.15, 308.15, 313.15, and 318.15) K

This paper reports measurements of densities and viscosities for the binary mixtures of triethylene glycol (TEG)+water as a function of composition at T=(298.15, 303.15, 308.15, 313.15, and 318.15) K. Densities were measured using a capillary pycnometer and viscosities were determined with an Ubbelohde capillary viscometer. The experimental results are compared with data published in the literatures. From the experimental data, including density and viscosity values, the excess molar volumes VmE, and viscosity deviations Δν, the calculated results are fitted to a Redlich–Kister equation to obtain the coefficients and estimate the standard deviations between the experimental and calculated quantities. The values of VmE are negative in the whole composition range, whereas the values of Δν are positive over the major composition range. From the kinematic viscosity data, enthalpy of activation for viscous flow (ΔH⁎) and entropy of activation for the viscous flow (ΔS⁎) were calculated.