Reference Correlation of the Viscosity of Squalane from 273 to 373 K at 0.1 MPa

International audienceThe paper presents a new reference correlation for the viscosity of squalane at 0.1 MPa. The correlation should be valuable as it is the first to cover a moderately high viscosity range, from 3 to 118 mPa s. It is based on new viscosity measurements carried out for this work, as well as other critically evaluated experimental viscosity data from the literature. The correlation is valid from 273 to 373 K at 0.1 MPa. The average absolute percentage deviation of the fit is 0.67, and the expanded uncertainty, with a coverage factor k = 2, is 1.5%

High pressure viscosity and density modeling of two polyethers and two dialkyl carbonates

cited By 29International audienceThis paper reports results concerning the dynamic viscosity η and the density ρ of four pure substances (dimethyl carbonate, diethyl carbonate, triethylene glycol dimethyl ether and tetraethylene glycol dimethyl ether) as a function of pressure (up to 100 MPa) and temperature (from 283.15 to 353.15 K). All our previously published, Int. J. Thermophy. 22 (2001) 749, experimental values (184 values for viscosity and 410 values for density) have been used in order to test several representative models. The density is discussed with six equations of state (Peng-Robinson, Soave-Redlich-Kwong, Soave-Redlich-Kwong modified, Lee-Kesler, Patel-Teja, and Nishiumi-Saïto) and with the Tait representation. The viscosity is discussed with empirical models, with semi-empirical models such as a self-referencing model and a model based on residual viscosity, and with models with strong physical background such a model based on the hard-sphere scheme, and a free-volume viscosity model. © 2002 Elsevier Science B.V. All rights reserved

Reference Correlations for the Density and Viscosity of Squalane from 273 to 473 K at Pressures to 200 MPa

International audienceThis paper presents new reference correlations for both the density and viscosity of squalane at high pressure. These correlations are based on critically evaluated experimental data taken from the literature. In the case of the density, the correlation, based on the Tait equation, is valid from 273 to 473 K at pressures to 200 MPa. At 0.1 MPa, it has an average absolute deviation of 0.03%, a bias of 0.01%, and an expanded uncertainty (at the 95% confidence level) of 0.06%. Over the whole range of pressures, the density correlation has an average absolute deviation of 0.05%, a bias of 0.004%, and an expanded uncertainty (at the 95% confidence level) of 0.18%. In the case of the viscosity, two correlations are presented, one a function of density and temperature, based on the Assael-Dymond model, and the other a function of temperature and pressure, based on a modified Vogel-Fulcher- Tammann equation. The former is slightly superior to the latter at high temperatures (above 410 K), whereas the reverse is true at low temperatures, where the viscosity is strongly temperature dependent. In the temperature range from 320 to 473 K at pressures to 200 MPa, the first correlation has an average absolute deviation of 1.41%, a bias of 0.09%, and an expanded uncertainty (at the 95% confidence level) of 3%. Below 320 K, deviations from the present scheme rise to a maximum of 20%. In the temperature range from 278 to 473 K at pressures to 200 MPa, the second viscosity correlation has an average absolute deviation of 1.7%, a bias of 0.04%, and an expanded uncertainty (at the 95% confidence level) of 4.75%