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Elastohydrodynamic lubricant flow with nanoparticle tracking

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Abstract

Lubricants operating in elastohydrodynamic (EHD) contacts exhibit local variations in rheological properties when the contact pressure rises. Direct evidence of this behaviour has only been obtained by examining through-thickness velocity profiles U(z) of lubricants in a contact using luminescence-based imaging velocimetry. In the present study, nanoparticles (NPs) are added to polybutene (PB) as tracers to investigate the effect of pressure on the flow of PB in an EHD contact. By tracking NPs in the contact, particle velocity distributions f(U) under various pressures are obtained and found to be pressure dependent. Results show quantitatively that f(U) and U(z) are correlated and thus confirm that U(z) of PB changes from Couette flow to partial plug flow above a critical pressure. This confirmation highlights the complexity of lubricant rheology in a high pressure contact.

Graphical abstract: Elastohydrodynamic lubricant flow with nanoparticle tracking

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Article information


Submitted
14 Nov 2018
Accepted
22 Dec 2018
First published
11 Jan 2019

This article is Open Access

RSC Adv., 2019,9, 1441-1450
Article type
Paper

Elastohydrodynamic lubricant flow with nanoparticle tracking

S. Jeffreys, L. di Mare, X. Liu, N. Morgan and J. S. S. Wong, RSC Adv., 2019, 9, 1441
DOI: 10.1039/C8RA09396B

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    [Original citation] - Published by The Royal Society of Chemistry.

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