Viscoelasticity and shear-thinning effects on bio-polymer solution and suspended particle behaviours under oscillatory curve Couette flow conditions

Biosurface and Biotribology

Alaleh Safari¹  Michel Jose Cervantes¹  Nazanin Emami¹ 

[1] Luleå University of Technology;

关键词: lubricants;    polymer solutions;    Couette flow;    non-Newtonian flow;    lubrication;    fluid oscillations;    shear flow;    biomechanics;    elasticity;    wear resistance;    flow visualisation;    viscoelasticity;    prosthetics;    biomedical materials;    suspensions;    two-phase flow;    failure (mechanical);    channel flow;    viscoelasticity;    total hip replacement;    lubrication;    bearing surfaces;    wear particle distribution patterns;    implant gap;    design parameters;    human joint synovial fluid;    microparticle image velocimetry;    motion frequency;    biolubricant flows;    suspended particles;    fluid shear thinning;    biopolymer solution;    oscillatory curve Couette flow;    wear resistance;    curved minichannels;    cross-stream migration;   

DOI  :  10.1049/bsbt.2018.0002

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown