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Base fluid parameters for elastohydrodynamic lubrication and friction calculations and their influence on lubrication capability
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0001-9110-2819
2001 (English)In: Journal of Synthetic Lubrication, ISSN 0265-6582, Vol. 18, no 3, p. 183-198Article in journal (Refereed) Published
Abstract [en]

In this study, base fluid parameters for elastohydrodynamic lubrication (EHL) and friction analyses have been determined experimentally. The viscosity at atmospheric pressure, η0, the pressure-viscosity index, α and the EHL friction coefficient, γ, are important parameters in EHL theory and they are crucial in the selection of efficient lubricants for different applications. This investigation focuses on three important lubrication mechanisms: The capability of forming a separating lubricants film, the friction generated in a lubricated contact, and the height of pressure peaks, such as the outlet pressure spike and pressure ripple caused by surface roughness. The influence of different lubricant parameters on these three mechanism is discussed. The value of α is measured in a Couette high-pressure viscometer, and the value of γ is obtained from a jumping-ball device. Other parameters discussed are temperature-viscosity coefficient, β, bulk modulus, BO, thermal conductivity at atmospheric pressure, λO, and heat capacity unit volume, ρCpO. A comparison between traditional mineral base oils and environmentally adapted oil based on rapeseed oil and synthetic esters contributes to the further understanding of the performance of these new materials in lubrication applications. It is shown that rapeseed oil and synthetic esters have good lubricating properties and are, in most cases, better than mineral oils.

Place, publisher, year, edition, pages
2001. Vol. 18, no 3, p. 183-198
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-12584DOI: 10.1002/jsl.3000180302Local ID: bbff9780-d588-11db-8550-000ea68e967bOAI: oai:DiVA.org:ltu-12584DiVA, id: diva2:985535
Note
Godkänd; 2001; 20061109 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-01-10Bibliographically approved

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Larsson, RolandKassfeldt, ElisabetNorrby, Thomas

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