Imperial College London

DrJanetWong

Faculty of EngineeringDepartment of Mechanical Engineering

Senior Lecturer
 
 
 
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Contact

 

+44 (0)20 7594 8991j.wong

 
 
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Location

 

671City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Dench:2016:10.1007/s11249-016-0807-3,
author = {Dench, J and Morgan, N and Wong, J},
doi = {10.1007/s11249-016-0807-3},
journal = {Tribology Letters},
title = {Quantitative viscosity mapping using fluorescence lifetime measurements},
url = {http://dx.doi.org/10.1007/s11249-016-0807-3},
volume = {65},
year = {2016}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - Lubricant viscosity is a key driver in both the tribological performance and energy efficiency of a lubricated contact. Elastohydrodynamic (EHD) lubrication produces very high pressures and shear rates, conditions hard to replicate using conventional rheometry. In situ rheological measurements within a typical contact are therefore important to investigate how a fluid behaves under such conditions. Molecular rotors provide such an opportunity to extract the local viscosity of a fluid under EHD lubrication. The validity of such an application is shown by comparing local viscosity measurements obtained using molecular rotors and fluorescence lifetime measurements, in a model EHD lubricant, with reference measurements using conventional rheometry techniques. The appropriateness of standard methods used in tribology for high-pressure rheometry (combining friction and film thickness measurements) has been verified when the flow of EHD lubricant is homogeneous and linear. A simple procedure for calibrating the fluorescence lifetime of molecular rotors at elevated pressure for viscosity measurements is proposed.
AU - Dench,J
AU - Morgan,N
AU - Wong,J
DO - 10.1007/s11249-016-0807-3
PY - 2016///
SN - 1573-2711
TI - Quantitative viscosity mapping using fluorescence lifetime measurements
T2 - Tribology Letters
UR - http://dx.doi.org/10.1007/s11249-016-0807-3
UR - http://hdl.handle.net/10044/1/43259
VL - 65
ER -