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Free-surface grease flow: influence of surface roughness and temperature
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-5294-1855
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
SKF ERC, Tribology Group.ORCID iD: 0000-0001-9356-7599
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2015 (English)In: Tribology letters, ISSN 1023-8883, E-ISSN 1573-2711, Vol. 59, no 1, article id 18Article in journal (Refereed) Published
Abstract [en]

Grease flow in grease lubricated systems can often be qualified as free-surface flow. It occurs for example in rolling bearings after the churning phase or on open gears. Here only a fraction of the bearing or gearbox volume is filled with grease. Part of the grease is flowing in relatively thin layers induced by centrifugal forces caused by rotation of the various components. In this paper a model problem is investigated in the form of a free-surface flow of grease on a rotating disc. Experiments have been performed where the onset of flow and remaining grease have been studied varying the surface roughness, temperature and the centrifugal forces. The experiments have been coupled to analytical models describing the flow and temperature distribution in the grease. It was found that the impact of surface roughness could be neglected. The flow is determined by the centrifugal forces and rheology of the grease. Temperature effects the rheology but also the oil separation creating low shear strength/low viscosity layers at the surface.

Place, publisher, year, edition, pages
2015. Vol. 59, no 1, article id 18
National Category
Fluid Mechanics and Acoustics Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Fluid Mechanics; Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-8807DOI: 10.1007/s11249-015-0537-yISI: 000356539000018Scopus ID: 2-s2.0-84930656362Local ID: 75ade837-7eab-45d5-9ec4-9cb64e09e705OAI: oai:DiVA.org:ltu-8807DiVA, id: diva2:981745
Note
Validerad; 2015; Nivå 2; Bibliografisk uppgift: This article is part of the Topical Collection on STLE Tribology Frontiers Conference 2014; 20150414 (lgwe)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Westerberg, Lars-GöranLi, JinxiaHöglund, ErikLugt, PietBaart, Pieter

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Fluid Mechanics and AcousticsTribology (Interacting Surfaces including Friction, Lubrication and Wear)

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