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µPIV measurement of grease velocity profiles in channels with two different types of flow restrictions
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.
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.ORCID iD: 0000-0001-5294-1855
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
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2012 (English)In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 54, p. 94-99Article in journal (Refereed) Published
Abstract [en]

Grease is commonly used to lubricate various machine components such as rolling bearings and seals. In this paper the flow of lubricating grease passing restrictions is described. Such flow occurs in rolling bearings during relubrication events where the grease is flowing in the transverse (axial) direction through the bearing and is hindered by guide rings, flanges et cetera, as well as in seals where transverse flow occurs, for example during so-called breathing caused by temperature fluctuations in the bearing. This study uses a 2D flow model geometry consisting of a wide channel with rectangular cross-section and two different types of restrictions to measure the grease velocity vector field, using the method of Micro Particle Image Velocimetry. In the case of a single restriction, the horizontal distance required for the velocity profile to fully develop is approximately the same as the height of the channel. In the corner before and after the restriction, the velocities are very low and part of the grease is stationary. For the channel with two flow restrictions, this effect is even more pronounced in the “pocket” between the restrictions. Clearly, a large part of the grease is not moving. This condition particularly applies to the cases with a low-pressure drop and where high consistency grease is used. In practice this means that grease is not replaced in such “corners” and that some aged/contaminated grease will remain in seal pockets.

Place, publisher, year, edition, pages
2012. Vol. 54, p. 94-99
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear) Fluid Mechanics and Acoustics
Research subject
Machine Elements; Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-3552DOI: 10.1016/j.triboint.2012.03.007Local ID: 16176110-642e-4435-b506-e49428614fe4OAI: oai:DiVA.org:ltu-3552DiVA: diva2:976410
Note
Validerad; 2012; 20120403 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-01-10Bibliographically approved

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Li, JinxiaHöglund, ErikWesterberg, Lars-GöranGreen, TorbjörnLundström, T. StaffanLugt, PietBaart, Pieter
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Tribology (Interacting Surfaces including Friction, Lubrication and Wear)Fluid Mechanics and Acoustics

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