Temperature and pressure dependences of volumetric properties of two poly(propylene glycol) dimethyl ether lubricants

Fandiño, Olivia; Lugo, Luis; Comuñas, Marı́a J. P.; López, Enriqueta R.; Fernández, Josefa

doi:10.1016/j.jct.2009.07.013

Cited by 32 publications

(37 citation statements)

References 43 publications

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“…1 and with the parameters in Table 3 we have calculated the values of this thermophysical property at several pressures and temperatures (Table 4). Both thermophysical properties, a p and j T , present the same behavior for the three PAGs studied in our laboratory [33]. Owing to the possible interest of PAGs as hydraulic fluids, we have also compared the value of the isothermal compressibility with other hydraulic fluids studied in our laboratory [43].…”

Section: Densitymentioning

confidence: 70%

“…Both the complete equipment and the experimental procedure have been described in detail in a previous article [33]. Taking into account the uncertainties of the temperature, the pressure, the period of oscillation measurements, the water density, and the additional uncertainty that results from the density corrections because of the sample viscosity, the total uncertainty of our density measurements is estimated to be 0.7 kg m -3 for temperatures lower than 373.15 K [34] and 0.8 kg m -3 for higher temperatures [35].…”

Section: Densitymentioning

confidence: 99%

“…It can be seen how, as usual, q increases when the temperature decreases or when the pressure increases. Following our previous study [33], we compare the density of PAG3 with PAG1 and PAG2, which are polypropylene glycols dimethyl ether (i.e., double end capped). The next sequence for densities at the same pT conditions was found:…”

Section: Densitymentioning

confidence: 99%

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Pressure–Viscosity Coefficients for Polyalkylene Glycol Oils and Other Ester or Ionic Lubricants

et al. 2011

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We present in this article new viscosity and density data for polypropylene glycol monomethyl ether, which completes a series of articles where we have published dynamic viscosity data of poly(propylene glycol) dimethyl ethers, dipentaerythritol esters, and pentaerythritol esters. New dynamic viscosity measurements up to 60 MPa at five temperatures in the range of 303.15-373.15 K, and density values at temperatures ranging from 298.15 to 398.15 K up to 60 MPa are reported in addition to other physical properties that affect the behavior of the fluids in elastohydrodynamic lubrication regime, such as the viscosity index value, VI, the universal pressure-viscosity coefficient, a film , and the temperature-viscosity coefficient, b. The experimental measurements were performed using a rotational automated viscometer Anton Paar Stabinger SVM3000, a rolling-ball viscometer Ruska 1602-830 for high pressures, and an automated Anton Paar DMA HPM vibrating-tube densimeter. Together with these data, we also present a comparison of the film-generating capability for the fluids above mentioned as well as for other five ionic liquids. We analyze the dependence of the molecular structure on the lubrication properties of these oils, which can help the lubricant engineers to develop products with enhanced performance.

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Section: Densitymentioning

confidence: 70%

Section: Densitymentioning

confidence: 99%

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Pressure–Viscosity Coefficients for Polyalkylene Glycol Oils and Other Ester or Ionic Lubricants

et al. 2011

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“…; , Fandiño et al 19,20 ; , Tripathi 21 ; , Kumagai et al ; , Fandiño et al 19,20 ; , Tripathi 21 ; , Kumagai et al 22 ; , Tomida et al 23 ; , Ciotta et al 26 ; , Dubey and Sharma 24 ; , Harris 25 ; , Fandiño et al 27 ; , Mylona et al 28 ; , New Data. (4) 37 ; , Pensado et al 38 ; , Bair 39 ; , Paredes et al 40 ; , Comuñas et al 42 ; , Comuñas et al 42 ; , New Data.…”

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New Experimental Data and Reference Models for the Viscosity and Density of Squalane

et al. 2014

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Empirical models for the density and the viscosity of squalane (C30H62; 2,6,10,15,19,23-hexamethyltetracosane) have been developed based on an exhaustive review of the data available in the literature and new experimental density and viscosity measurements carried out as a part of this work. The literature review showed there was a substantial lack of density and viscosity data at high temperature (373 to 473) K and high pressure conditions (pressures up to 200 MPa). These gaps were addressed with new experimental measurements carried out at temperatures of (338 to 473) K and at pressures of (1 to 202.1) MPa. The new data were utilized in the model development to improve the density and viscosity calculation of squalane at all conditions including high temperatures and high pressures.The model presented in this work reproduces the best squalane density and viscosity data available based on a new combined outlier and regression algorithm. The combination of the empirical models and the regression approach resulted in models which could reproduce the experimental density data with average absolute percent deviation of 0.04%, bias of 0.000%, standard deviation of 0.05%, and maximum absolute percent deviation of 0.14% and reproduce the experimental viscosity data with average absolute percent deviation of 1.4%, bias of 0.02%, standard deviation of 1.8% and maximum absolute percent deviation of 4.9% over a wide range of temperatures and pressures. Based on the data set used in the model regression (without outliers), the density model is limited to the pressure and temperature ranges of (0.1 to 202.1) MPa and (273 to 525) K, while the viscosity model is limited to the pressure and temperature ranges of (0.1 to 467.0) MPa and (273 to 473) K. These models can be used to calibrate laboratory densitometers and viscometers at relevant hightemperature, high-pressure conditions.

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“…The empirical models of density, such as the Aalto-Keskinen model [10], the Dowson-Higginson model [11], the Hankinson-Brobst-Thomson model [12], and the Tammann-Tait model [1,13], were developed by curve fitting macroscopic experimental data. Cibulka and Hnědkovský [14], Pecar and Dolecek [15], and Fandiño et al [16][17][18] Greek letters density (kg/m 3 ) ε energy parameter (kcal) -Eq. (1) distance parameter (Å) -Eq.…”

Section: Introductionmentioning

confidence: 99%

Confined fluid density of a pentaerythritol tetraheptanoate lubricant investigated using molecular dynamics simulation

Pan

Gao

2015

Fluid Phase Equilibria

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Temperature and pressure dependences of volumetric properties of two poly(propylene glycol) dimethyl ether lubricants

Cited by 32 publications

References 43 publications

Pressure–Viscosity Coefficients for Polyalkylene Glycol Oils and Other Ester or Ionic Lubricants

Pressure–Viscosity Coefficients for Polyalkylene Glycol Oils and Other Ester or Ionic Lubricants

New Experimental Data and Reference Models for the Viscosity and Density of Squalane

Confined fluid density of a pentaerythritol tetraheptanoate lubricant investigated using molecular dynamics simulation

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