Relation between low temperature fluidity and sound velocity of lubricating oil

Mia, Sobahan; Ohno, Nobuyoshi

doi:10.1016/j.triboint.2009.12.027

Cited by 11 publications

(6 citation statements)

References 10 publications

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“…Both adiabatic bulk modulus and the viscoelastic solid transition temperature depend on the samples bulk property. Mia and Ohno 33 have found that lubricating oils of low adiabatic bulk modulus present a better fluidity at low temperatures. Consequently, it is expected that the better low-temperature behavior corresponds to PAO6 and the poorest to G-V.…”

Section: Resultsmentioning

confidence: 99%

Volumetric Behavior of Some Motor and Gear-Boxes Oils at High Pressure: Compressibility Estimation at EHL Conditions

Guimarey

Comuñas

López

et al. 2017

Ind. Eng. Chem. Res.

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Characterization of elastohydrodynamic lubrication, EHL, contacts requires an appropriate EoS for the lubricant. Experimental viscosities and speeds of sound of six lubricants from 278.15 to 398.15 K at 0.1 MPa together with densities up to 120 MPa are reported. Tammann-Tait and the two EoSs based on the scaling concept describe the experimental densities of the six oils with average deviations lower to 0.03%. Dowson-Higginson and Zhu and Wen equations currently used in numerical simulations of the EHL regime predict these experimental densities with AADs lower than 0.5%. The prediction ability for volumetric properties, mainly isothermal compressibility, of these five EoSs up to 3000 MPa, which can be reached in EHL lubrication, was evaluated. An asymptotic behavior is observed when density is plotted versus pressure for Dowson-Higginson and Zhu and Wen equation, which is not a realistic behavior. The EoSs used in the correlations predict more reasonable trends with pressure.

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Section: Resultsmentioning

confidence: 99%

Volumetric Behavior of Some Motor and Gear-Boxes Oils at High Pressure: Compressibility Estimation at EHL Conditions

Guimarey

Comuñas

López

et al. 2017

Ind. Eng. Chem. Res.

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“…It is also a deciding factor of wear of machine parts. Better rheological behavior with temperature will lead to better tribology [10]. Mia and Ohno [11] measured adiabatic bulk modulus using Sing around technique [12].…”

Section: Introductionmentioning

confidence: 99%

Study of Rheological Properties of Industrial Lubricants

Vasishth

Kuchhal

Anand

2014

Conference Papers in Science

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The most important rheological parameter for lubricants is viscosity as it also affects the tribological properties like friction between interacting surfaces and wear. This research intends to study the relationship between viscosity and temperature at different shear rates for multiple grades of three different categories of lubricants used for different applications viz. L1: MG20W50 (engine oil), L2: SAE20W50 (engine oil), L3: MC20W50 (mineral engine oil), L4: EP90 (gear oil), and L5: DXTIII (steering fluid). Constant high dynamic viscosity, shear stress, and low compressibility at different temperatures in multigrade as well as single grade industrial oil will help to maintain the surface film over the period of time and hence the reduction in wear. The dynamic viscosity of these chosen samples has been measured experimentally in temperature range of 20 to 50 ∘ C. The measurements have been extended to observe the dependence of shear rate, time, and temperature on the dynamic viscosity. All the samples are observed to behave like Newtonian fluids in the entire temperature range of study. Further, all samples seem to obey the Arrhenius relationship with temperature. Shear stress shows linear variation with shear rate exhibiting uniform viscosity which is substantiated by almost no variation in dynamic viscosity with shear rate for value above 5 per second.

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“…Adiabatic bulk modulus low values translate to good low-temperature fluidity. All the studied compounds have close values to regular lubricants [3]. The thermal expansion coefficient is represented in Figure 4.…”

Section: Apparatusmentioning

confidence: 76%

“…Adiabatic bulk modulus (KS) and thermal expansion coefficient (αp) can be obtained using the density and speed of sound. Low values of adiabatic bulk modulus imply good low-temperature fluidity [2,3]. The adiabatic bulk modulus can be used as a predictive parameter for the pressureviscosity coefficient [2].…”

Section: Introductionmentioning

confidence: 99%

Thermophysical Characterization of TFSI Based Ionic Liquid and Lithium Salt Mixtures

Fernández-Míguez

Vallet

Tasende-Rodríguez

et al. 2019

The 23rd International Electronic Conference on Synthetic Organic Chemistry

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The ionic liquids (ILs) doped with metal salts have become a real alternative as electrolytes for batteries, but the right choice of these compounds for reaching the adequate properties and performance is still a challenge, and strategies are therefore needed for achieving it. The thermophysical properties of IL 1-butyl-1-methylpyrrolidinium bis[(trifluoromethyl)sulfonyl]imide ([bmpyr] [TFSI]) and its mixture with bis-(trifluoromethane)-sulfonimide lithium salt (from 0.1 m to saturation level) were determined in this work. These properties are density (ρ), speed of sound (U), and corresponding derived magnitudes, such as the bulk modulus and the thermal coefficient, as well as electrical conductivity (σ) against temperature. Density shows a linear decreasing dependence with temperature and a clear increase with the addition of salt, whereas the thermal expansion coefficient increases with temperature and salt addition. Speed of sound decreases with both temperature and salt concentration, and the adiabatic compressibility calculated by means of the well-known Laplace equation increases, as expected, with temperature in all the studied cases, although a small variation with concentration was observed. Electrical conductivity increases with temperature following the Vogel-Fulcher-Tammann (VFT) equation and decreases with the addition of salt.

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Relation between low temperature fluidity and sound velocity of lubricating oil

Cited by 11 publications

References 10 publications

Volumetric Behavior of Some Motor and Gear-Boxes Oils at High Pressure: Compressibility Estimation at EHL Conditions

Volumetric Behavior of Some Motor and Gear-Boxes Oils at High Pressure: Compressibility Estimation at EHL Conditions

Study of Rheological Properties of Industrial Lubricants

Thermophysical Characterization of TFSI Based Ionic Liquid and Lithium Salt Mixtures

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