جهت دسترسی به کاربرگه ی زیر، از این لینک استفاده کنید. http://dl.pgu.ac.ir/handle/Hannan/81535
Title: Quantitative viscosity mapping using fluorescence lifetime measurements
Keywords: Mechanical Engineering & Transports;0912 Materials Engineering; Mechanical Engineering
Issue Date: 30-Dec-2016
16-Dec-2016
Publisher: Springer Verlag
place: Engineering & Physical Science Research Council (EPSRC);Engineering & Physical Science Research Council (EPSRC)
Description: 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.
URI: http://dx.doi.org/10.1007/s11249-016-0807-3
Other Identifiers: 1573-2711
http://hdl.handle.net/10044/1/43259
EP/J015385/1
PT22478 - PO 4550059303
EP/L023202/1
Type Of Material: Other
Appears in Collections:Faculty of Engineering

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