Film thickness anomalies in very thin elastohydrodynamic oil films

Baskerville, F.M.; Moore, Andrew J.

doi:10.1016/s0167-8922(08)70444-9

Cited by 3 publications

(2 citation statements)

References 12 publications

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“…However, larger decrease in the values of α at higher temperatures corresponds to thinner film formation at that temperature. The behaviour is similar to VI characteristics depicted for base fluids, and groups III to V base oils exhibit low values of α compared with groups I and II base oils …”

Section: Introductionsupporting

confidence: 70%

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Correlation of structure and properties of groups I to III base oils

Sarpal

Sastry

Bansal

et al. 2012

Lubrication Science

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The understanding of the relationship between molecular structure and viscosity–temperature behaviour of a lubricant system is a subject of considerable importance. The quantitative distribution and types of different classes of hydrocarbons such as aromatics, paraffins (normal and iso) and naphthenes determine the physico‐chemical behaviour of a lubricant system. The study of molecular structure and molecular alignment of hydrocarbons constituting a lubricant helps in the development of lubricating oil with desired physico‐chemical properties. The present study highlights the application of nuclear magnetic resonance spectroscopic technique for deriving detailed hydrocarbon structural features present in API groups II and III base oils produced through catalytic hydrocracking/isodewaxing processes. The viscosity–temperature and viscosity–pressure properties, such as viscosity index, pour point, elastohydrodynamic film thickness and cold cranking simulator viscosity, were determined. The structural features of these base oils such as various methyl branched structures of isoparaffins and branching index, which are characteristics of high performance molecules, were correlated with the above‐mentioned properties to explain their physico‐chemical properties, particularly low temperature properties. The molecular dynamics parameters such as diffusion coefficient and T1 relaxation times estimated from the nuclear magnetic resonance spectral studies have provided sufficient evidence for the dependence of these properties on these high performance molecules present in various types of methyl structures of isoparaffins of groups II and III base oils compared with conventional group I base oils. Results are explained on the basis of molecular structural differences of hydrocarbons present in these base oils and diffusion measurement studies. On the basis of the studies, molecular engineering concept for the designing of a high performance base oil molecule is proposed. Copyright © 2012 John Wiley & Sons, Ltd.

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Section: Introductionsupporting

confidence: 70%

“…The pressure–viscosity coefficient (α) describes the film generating capabilities of a lubricant and allows the calculation of a film thickness at EHD contacts in tribological contacts . The higher value of α implies thicker film formation compared with other fluids under study, and α decreases with increase in temperature.…”

Section: Introductionmentioning

confidence: 99%

Correlation of structure and properties of groups I to III base oils

Sarpal

Sastry

Bansal

et al. 2012

Lubrication Science

View full text Add to dashboard Cite

show abstract

Nanometer Elastohydrodynamic Lubrication

Moore

1997

Elastohydrodynamics - '96 Fundamentals and Applications in Lubrication and Traction, Proceedings of the 23rd Leeds-Lyon Symposi

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Gasoline Lubricity

Arkoudeas¹

2022

Crude Oil - New Technologies and Recent Approaches

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It is concluded that the lubricity of gasoline is the least well understood of all three fuels due largely to the lack of a reliable test method for measuring the lubricity of such a very volatile and contamination-sensitive material. To overcome this limitation, the development of a simple and easy methodology based on the general standard ASTM G-133 have been produced. This method is first used to investigate the lubricity of commercial gasolines to obtain some baseline data for further study. A comparison of the overall lubricity level of diesel fuel and gasoline fuel indicates that additive-free gasolines have significantly poorer lubricity than highly-refined, Swedish Class I diesel fuel, while commercial, detergent-containing gasolines range from slightly better to significantly poorer than a Swedish Class I diesel fuel. Especially LRP (lead replacement) gasolines developed a tests on refinery streams used to blend gasoline also show quite varied wear behaviour. Gasoline lubricity can be significantly improved by adding small amount of diesel lubricity additives. The results indicate that the type of fuel is a significant factor for discriminating the lubrication properties of each type of gasoline fuel and that lubricity is affected by bulk and trace composition characteristics of the fuel.

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Film thickness anomalies in very thin elastohydrodynamic oil films

Cited by 3 publications

References 12 publications

Correlation of structure and properties of groups I to III base oils

Correlation of structure and properties of groups I to III base oils

Nanometer Elastohydrodynamic Lubrication

Gasoline Lubricity

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