Viscosity of liquid diethylene, triethylene and tetraethylene glycols at moderately high pressures using a vibrating wire instrument

• Published in: Fluid phase equilibria Vol. 480; pp. 87 - 97
• Main Authors: Pereira, Marta F.V., Avelino, Helena M.N.T., Caetano, Fernando J.P., Fareleira, João M.N.A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 25.01.2019
• Subjects: Ethylene glycol; High pressure; PEG; Vibrating wire; Viscosity; Viscosity; Ethylene glycol; PEG; Vibrating wire; High pressure
• ISSN: 0378-3812; 1879-0224
• DOI: 10.1016/j.fluid.2018.09.026

New viscosity measurements of compressed liquid diethylene glycol (DiEG), triethylene glycol (TriEG) and tetraethylene glycol (TeEG) have been performed using a vibrating wire instrument operated in the forced oscillation mode. The measurements have been carried out in a range of pressures up to 70 MPa and temperatures from (293–363) K, covering a total range of viscosities from (3.46–1.15 × 102) mPa⋅s. Complementary experimental density data were obtained for the same glycols using an Anton Paar vibrating U-tube densimeter. These measurements have been performed in a range of temperatures from about (283–363) K and at pressures up to about 70 MPa. The viscosity results were correlated with density, using a modified hard-spheres scheme. The experimental density data were correlated, as a function of temperature and pressure, with a modified Tait-type equation. The expanded uncertainty of the present viscosity results at a 95% confidence level is estimated to be less than ±2.0% for viscosities up to 68 mPa s and less than ±2.6% for higher viscosities. The densities have an expanded uncertainty of ±0.2% at a 95% confidence level. [Display omitted]