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On the Flow of Lubricating Greases: a Computational Fluid Dynamics Approach
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
Number of Authors: 3
2016 (English)Conference paper, Abstract (Refereed)
Abstract [en]

Being able to model the flow dynamics of grease is highly valuable in the design of lubricated machine elements such as rolling element bearings. An understanding of the grease flow dynamics enables prediction of grease distribution for optimum lubrication and for the migration of wear- and contaminant particles. In this paper the potential of combined analytical modelling, flow visualizations, and numerical modelling in grease flow dynamics is presented. Specifically, the relation between the rheology of the grease and its impact on the flow motion is of interest in combination with validation of the numerical models in simplified geometries. The numerical models then enable simulations in more complex geometries of particular interest for the grease and bearing industry. It is shown that grease flow is heavily influenced by its non-Newtonian properties and the shear rates in the contact, resulting in distinct regions of yielded and un-yielded grease. Further, the numerical models are shown to match well with experiments and analytical models, enabling numerical models on more intricate geometries in the bearing industry.

Place, publisher, year, edition, pages
2016.
National Category
Fluid Mechanics and Acoustics Tribology
Research subject
Fluid Mechanics; Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-61046OAI: oai:DiVA.org:ltu-61046DiVA: diva2:1055657
Conference
STLE Tribology Frontiers Conference, Chicago, Nov. 13-15, 2016
Available from: 2016-12-13 Created: 2016-12-13 Last updated: 2016-12-13Bibliographically approved

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