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Grease flow in an elbow channel
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-5294-1855
Department of Mechanical Engineering, UPC - Technical University of Catalonia.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0003-4785-7098
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2015 (English)In: Tribology letters, ISSN 1023-8883, E-ISSN 1573-2711, Vol. 57, no 3, article id 30Article in journal (Refereed) Published
Abstract [en]

The flow of lubricating greases in an elbow channel has been modeled and validated with velocity profiles from flow visualizations using micro-particle image velocimetry. The elbow geometry induces a nonsymmetric distribution of shear stress throughout its cross section, as well as varying shear rates through the transition from the elbow inlet to the outlet. The flow has been modeled both for higher flow rates and for creep flow. The influence of the grease rheology and flow conditions to wall slip, shear banding and an observed stick–slip type of motion observed for low flow rates are presented. The effect on the flow of the applied pressure is also modeled showing that the flow is sensitive to the pressure in the angular ( ϕ ) direction of the elbow. For high pressures, it is shown that the flow is reversed adjacent to the elbow walls.

Place, publisher, year, edition, pages
2015. Vol. 57, no 3, article id 30
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-11713DOI: 10.1007/s11249-015-0469-6ISI: 000351050800016Scopus ID: 2-s2.0-84924865257Local ID: ab81f40f-f721-47b7-960d-a2a86f41f90bOAI: oai:DiVA.org:ltu-11713DiVA, id: diva2:984663
Note

Validerad; 2015; Nivå 2; 20140331 (lgwe)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Westerberg, Lars-GöranLi, JinxiaHöglund, Erik

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

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