Experimental density and viscosity measurements of di(2ethylhexyl)sebacate at high pressure

• Published in: The Journal of chemical thermodynamics 2012, Vol.44 (1), p.38-43
• Main Authors: Paredes, Xavier, Fandiño, Olivia, Pensado, Alfonso S., Comuñas, María J.P., Fernández, Josefa
• Format: Article
• Language: English
• Subjects: Computational fluid dynamics; Cross-disciplinary physics: materials science; rheology; Density; Di(2-ethylhexyl)sebacate; Exact sciences and technology; Fluid flow; Fluids; High pressure; Mathematical models; Physics; Rheology; Rolling-ball viscometer; Techniques and apparatus; Viscometers; Viscosity; Viscosity measurement; Viscosity measurements
• ISSN: 0021-9614; 1096-3626
• DOI: 10.1016/j.jct.2011.07.005

► We measure viscosities for di(2-ethylhexyl)sebacate from (298.15 to 398.15) K and up to 60 MPa. ► We measure densities for DEHS from (298.15 to 373.15) K and from (0.1 to 60) MPa. ► The reported and lit. data were used in a viscosity correlation from (273 to 491) K and up to 1.1 GPa. ► This correlation could be used in industrial equipment that operate at high pressures. Experimental densities and dynamic viscosities of di(2-ethylhexyl)sebacate (DEHS) are the object of study in this work. DEHS could be a useful industrial reference fluid for moderately high viscosity at high pressures as it is often used as a pressure transmitting fluid. At atmospheric pressure the density and viscosity measurements have been performed in a rotational SVM 3000 Stabinger viscometer from (273.15 to 373.15) K, whereas from (0.1 to 60) MPa and from (298.15 to 398.15) K an automated Anton Paar DMA HPM vibrating-tube densimeter, and a high-pressure rolling-ball viscometer were used. Several Vogel–Fulcher–Tammann type equations were used to fit the experimental values of viscosity to the pressure and temperature. The measured viscosity data have been used together with previous data found in the literature to establish a correlation of the viscosity surface η( T, p) of DEHS, covering a temperature range from (273 to 491) K and pressure up to 1.1 GPa. This correlation could be used in industrial equipment like viscometers and other devices that operate at high pressures. Our viscosity data have also been fitted as a function of temperature and volume to the thermodynamic scaling model of Roland et al. [C.M. Roland, S. Bair, R. Casalini, J. Chem. Phys. 125 (2006) 124508].