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      Film forming behavior in thin film lubrication at high speeds

      , * , *

      Friction

      Tsinghua University Press

      thin film lubrication, thin EHL film, high speeds, starvation

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          Abstract

          The film forming condition may transit into thin film lubrication (TFL) at high speeds when it is under severe starvation. Central film thicknesses and film thickness profiles are obtained via a technique of relative optical interference intensity. These profiles show a critical film thickness lower than which the absolute values of the film thickness gradient against speed or time decrease. It is possible to be in the thin film lubrication mode under such conditions. The high speed flow drives the lubricant molecules to rearrange in TFL and critical film thickness higher than 100 nm is achieved. The viscosity is one of the main factors controlling the decreasing rate and the critical film thickness. This paper is designed to investigate the thin film lubrication behavior at high speeds.

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          Most cited references 22

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          Sixty years of EHL

           H A Spikes (2006)
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            Film Thickness in Starved EHL Point Contacts

            This paper presents a numerical study of the effects of inlet supply starvation on film thickness in EHL point contacts. Generally this problem is treated using the position of the inlet meniscus as the governing parameter; however, it is difficult to measure this in real applications. Thus, in this paper an alternative approach is adopted whereby the amount of oil present on the surfaces is used to define the degree of starvation. It is this property which determines both meniscus position and film thickness reduction. The effect of subsequent overrollings on film thickness decay can also be evaluated. In the simplest case a constant lubricant inlet film thickness in the Y direction is assumed and the film thickness distribution is computed as a function of the oil available. This yields an equation predicting the film thickness reduction, with respect to the fully flooded value, from the amount of lubricant initially available on the surface, as a function of the number of overrollings n. However, the constant inlet film thickness does not give a realistic description of starvation for all conditions. Some experimental studies show that the combination of side flow and replenishment action can generate large differences in local oil supply and that the side reservoirs play an important role in this replenishment mechanism. Thus the contact centre can be fully starved whilst the contact sides remain well lubricated. In these cases, a complete analysis with a realistic inlet distribution has been carried out and the numerical results agree well with experimental findings.
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              Thin film lubrication. Part I. Study on the transition between EHL and thin film lubrication using a relative optical interference intensity technique

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                Author and article information

                Journal
                Tsinghua Science and Technology
                Friction
                Tsinghua University Press (Xueyuan Building, Tsinghua University, Beijing 100084, China )
                2223-7690
                05 June 2018
                : 06
                : 02
                : 156-163 (pp. )
                Affiliations
                State Key Laboratory of Tribology, Tsinghua University, Beijing 100086, China
                Author notes
                * Corresponding authors: Dan GUO, E-mail: guodan26@ 123456tsinghua.edu.cn
                Jianbin LUO, E-mail: luojb@ 123456tsinghua.edu.cn

                Jianbin LUO. He received his BEng degree from Northeastern University in 1982, and got his MEng degree from Xi’an University of Architecture and Technology in 1988. In 1994, he received his PhD degree from Tsinghua University and then joined the faculty of Tsinghua University. Prof. Jianbin Luo is an academician of the Chinese Academy of Sciences and a Yangtze River Scholar Distinguished Professor of Tsinghua University, Beijing, China. He was awarded the STLE International Award (2013), the Chinese National Technology Progress Prize (2008), the Chinese National Natural Science Prize (2001), and the Chinese National Invention Prize (1996). Prof. Luo has been engaged in the research of thin film lubrication and tribology in nanomanufacturing. He was invited as a keynote or plenary speaker for 20 times on the international conferences.

                Dan GUO. She received the M.S. degree in engineering mechanics in 1995 from Xi’an Jiaotong University and Ph.D. degree in engineering mechanics in 1999 from Tsinghua University. She joined the State Key Laboratory of Tribology at Tsinghua University from 1999. Her current position is a professor and the deputy director of the laboratory. Her research areas cover the mechanism of interaction among nanoparticles, lubrication and failure mechanism under rigorous conditions, and movement behavior of confined-microfluidic.

                He LIANG. She received her Ph.D. degree in 2015 from State Key Lab of Tribology, Tsinghua University, China. The same year she joined the Tribology Group at Imperial College London as a postdoc. Her research areas involve the mechanism of lubrication behaviour in lubricated contacts and in rolling element bearings at high speeds.

                Article
                2223-7690-06-02-156
                10.1007/s40544-017-0159-5

                This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

                Page count
                Figures: 9, Tables: 2, References: 22, Pages: 8
                Categories
                Research Article

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