Imperial College London

Dr Tom Reddyhoff

Faculty of EngineeringDepartment of Mechanical Engineering

Senior Lecturer
 
 
 
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Contact

 

+44 (0)20 7594 3840t.reddyhoff Website

 
 
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Location

 

670City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Hili:2018:10.1080/10402004.2017.1323146,
author = {Hili, J and Pelletier, C and Jacobs, L and Olver, A and Reddyhoff, T},
doi = {10.1080/10402004.2017.1323146},
journal = {Tribology Transactions},
pages = {287--294},
title = {High-Speed Elastohydrodynamic Lubrication by a Dilute Oil-in-Water Emulsion},
url = {http://dx.doi.org/10.1080/10402004.2017.1323146},
volume = {61},
year = {2018}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - © 2018 Society of Tribologists and Lubrication Engineers. When a concentrated contact is lubricated at low speed by an oil-in-water emulsion, a film of pure oil typically separates the surfaces (stage 1). At higher speeds, starvation occurs (stage 2) and the film is thinner than would be expected if lubricated by neat oil. However, at the very highest speeds, film thickness increases again (stage 3), though little is known for certain about either the film composition or the mechanism of lubrication, despite some theoretical speculation. In this article, we report the film thickness in a ball-on-flat contact, lubricated by an oil-in-water emulsion, at speeds of up to 20 m/s, measured using a new high-speed test rig. We also investigated the sliding traction and the phase composition of the film, using fluorescent and infrared microscopy techniques. Results show that, as the speed is increased, starvation is followed by a progressive change in film composition, from pure oil to mostly water. At the highest speeds, a film builds up that has a phase composition similar to the bulk emulsion. This tends to support the “microemulsion” view rather than the “dynamic concentration” theory.
AU - Hili,J
AU - Pelletier,C
AU - Jacobs,L
AU - Olver,A
AU - Reddyhoff,T
DO - 10.1080/10402004.2017.1323146
EP - 294
PY - 2018///
SN - 1040-2004
SP - 287
TI - High-Speed Elastohydrodynamic Lubrication by a Dilute Oil-in-Water Emulsion
T2 - Tribology Transactions
UR - http://dx.doi.org/10.1080/10402004.2017.1323146
UR - http://hdl.handle.net/10044/1/48255
VL - 61
ER -