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Title: Thermohydrodynamics of lubricant flow with carbon nanoparticles in tribological contacts
Authors: Shahmohamadi, Hamed
Rahmani, Ramin
Rahnejat, Homer
Garner, Colin P.
Balodimos, N.
Keywords: Multiphase flow
Lagrangian model
Cavitation
Nanolubricant (nanofluid)
Sliding contact
Friction
Heat transfer
Issue Date: 2016
Publisher: © Elsevier
Citation: SHAHMOHAMADI, H. ... et al, 2016. Thermohydrodynamics of lubricant flow with carbon nanoparticles in tribological contacts. Tribology International, 113, pp. 50-57.
Abstract: This paper deals with the tribological performance of carbon nanoparticles dispersed in polyalphaolefin PAO6 oil. Stribeck curves are obtained under various operating conditions, using a fully instrumented pin-on-disc tribometer under controlled conditions. A detailed multi-physics thermal fluid flow model with Lagrangian low concentration discrete solid phase and Eulerian multi-phase fluid with cavitation represented by modified Rayleigh-Plesset and vapour transport equation is presented. The numerical predictions under identical conditions to the experiments show good conformance with the measurements, and provide a fundamental understanding of the role of nanoparticles. Results show improved heat transfer from the contact with the presence of nanoparticles even at low levels of concentration. The analysis shows that this leads to higher lubricant viscosity, load carrying capacity and reduced friction. Furthermore, a resulting small region of cavitation at low volume fraction does not unduly affect the enhanced heat transfer of nanoparticles. This combined experimentation and detailed numerical analysis has not hitherto been reported in literature.
Description: This paper is closed access until 29th December 2017.
Sponsor: The authors would like to acknowledge the financial support of Lloyds Register Foundation (LRF) to the International Cavitation Research Institute, under whose auspices the current research is carried out. The financial support of the Innovate UK in the use of nanoparticles is also acknowledged.
Version: Accepted for publication
DOI: 10.1016/j.triboint.2016.12.048
URI: https://dspace.lboro.ac.uk/2134/23877
Publisher Link: http://dx.doi.org/10.1016/j.triboint.2016.12.048
ISSN: 0301-679X
Appears in Collections:Closed Access (Mechanical, Electrical and Manufacturing Engineering)

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