Imperial College London
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ProfessorHughSpikes

Faculty of Engineering, Department of Mechanical Engineering

Professor
 
 
 
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Contact

 

+44 (0)20 7594 7063h.spikes

 
 
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Assistant

 

Mrs Chrissy Stevens +44 (0)20 7594 7064

 
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Location

 

673City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Marx:2018:10.1007/s11249-018-1039-5,
author = {Marx, N and Fernández, L and Barceló, F and Spikes, HA},
doi = {10.1007/s11249-018-1039-5},
journal = {Tribology Letters},
pages = {92--92},
title = {Shear thinning and hydrodynamic friction of viscosity modifier-containingoils. Part I: shear thinning behaviour},
url = {http://dx.doi.org/10.1007/s11249-018-1039-5},
volume = {66},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Viscosity versus shear rate curves have been measured up to 107 s−1 for a range of VM solutions and fully formulated oils of known composition at several temperatures. This shows large differences in the shear thinning tendencies of different engine oil VMs. It has been found that viscosity versus shear rate data at different temperatures can be collapsed onto a single master curve using time–temperature superposition based on a shear rate shift factor. This enables shear thinning equations to be derived that are able to predict the viscosity of a given oil at any shear rate and temperature within the range originally tested. One of the tested lubricants does not show this time temperature superposition collapse. This fluid also exhibits extremely high viscosity index and shear thins more easily at high than at low temperature, unlike all the other solutions tested. This unusual response may originate from the presence on the VM molecules of two structurally and chemically different components. In a companion paper, the master shear thinning curves obtained in this paper are used to explore how VMs impact film thickness and friction in a steadily loaded, isothermal journal bearing [1].
AU  - Marx,N
AU  - Fernández,L
AU  - Barceló,F
AU  - Spikes,HA
DO  - 10.1007/s11249-018-1039-5
EP  - 92
PY  - 2018///
SN  - 1023-8883
SP  - 92
TI  - Shear thinning and hydrodynamic friction of viscosity modifier-containingoils. Part I: shear thinning behaviour
T2  - Tribology Letters
UR  - http://dx.doi.org/10.1007/s11249-018-1039-5
UR  - https://link.springer.com/article/10.1007/s11249-018-1039-5
UR  - http://hdl.handle.net/10044/1/63870
VL  - 66
ER  -
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