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Viscoelasticity and shear-thinning effects on bio-polymer solution and suspended particle behaviours under oscillatory curve Couette flow conditions
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: 0000-0001-8676-8819
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics. Water Power Laboratory , Norwegian University of Science and Technology .ORCID iD: 0000-0001-7599-0895
2018 (English)In: Biosurface and Biotribology, ISSN 2405-4518, Vol. 4, no 1Article in journal (Refereed) In press
Abstract [en]

Formation of wear particles within total hip replacement is one of the main causes of its failure. In addition to improving the lubrication and wear resistance of materials used as bearing surfaces, understanding of wear particle distribution patterns within lubricants inside an implant gap could be used to improve design parameters and implants’ lifespan. In this study, the behaviours of biolubricants (with compositions similar to human joint synovial fluid) and suspended particles were investigated by micro-particle image velocimetry in curved mini channels under oscillatory Couette flow conditions. The studied biolubricants had shear-thinning viscoelastic characteristics. The authors found that increasing shear-thinning, elasticity or motion frequency levels did not affect the trend behaviours of biolubricant flows due to the low strain values of the experimental conditions applied. However, suspended particles formed strings along flow directions and exhibited cross-stream migration to channel walls. Motion frequency, fluid shear thinning and elasticity characteristics and channel dimensions strongly affected particle behaviours.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 4, no 1
National Category
Engineering and Technology 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-68670DOI: 10.1049/bsbt.2018.0002OAI: oai:DiVA.org:ltu-68670DiVA, id: diva2:1204309
Available from: 2018-05-07 Created: 2018-05-07 Last updated: 2018-05-22

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Safari, AlalehEmami, NazaninCervantes, Michel Jose
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Engineering and TechnologyTribology (Interacting Surfaces including Friction, Lubrication and Wear)Fluid Mechanics and Acoustics

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