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Free-Surface Flow of Lubricating Greases
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.
SKF ERC, University of Twente/SKF ERC.
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2016 (English)Conference paper, Presentation (Refereed)
Abstract [en]

Grease lubrication is traditionally used in a great variety of mechanicalsystems such as rolling bearings, seals, and gears where it has beenshown more advantageous than oil, mainly due to its consistencyallowing the grease to stay inside the system and not leak out. Freesurface effects play an important role in rolling bearings and opengears as the configuration normally is filled with about 30% grease toavoid heavy churning. In this study an analytical model of thestationary uniform flow on a rotating disc is developed and validatedwith experiments. The model results in the velocity profile for the flowin the thin fully yielded viscous layer in connection to the surface aswell as an expression for the plug flow region on top of the viscouslayer. Experiments with two different greases having NLGI grade 1 and2 respectively shows it is possible to obtain a good fit with theanalytically obtained thickness using the rheological parameters foractual greases.

Place, publisher, year, edition, pages
2016.
Research subject
Fluid Mechanics; Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-34367Local ID: 88a90512-6d63-4b60-9022-f0ea3070e1baOAI: oai:DiVA.org:ltu-34367DiVA: diva2:1007617
Conference
STLE Annual Meeting & Exhibition : 15/05/2016 - 19/05/2016
Note
Godkänd; 2016; 20160825 (andbra)Available from: 2016-09-30 Created: 2016-09-30Bibliographically approved

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Westerberg, Lars-GöranHöglund, ErikLi, Jinxia
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