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Research Article | Open Access

Direct observation of the impact of water droplets on oil replenishment in EHD lubricated contacts

Xiang LIU1, Jintao WANG1, Lu HUANG1( ), Jingyue ZHANG1, Changhong XU1, Lin TONG1, Dan GUO2( )
National Institute of Metrology, Beijing 100029, China
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
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Abstract

Water is one of the most significant causes of lubrication failure. There is little research on the direct observation of the impact of water on lubrication properties. In this study, the influence of water on oil replenishment under different elastohydrodynamic (EHD) lubricating conditions is evaluated using optical interferometry and infrared microscopy, and a dimensionless criterion when water influences the film thickness is proposed. Evidence shows that the scour displacing effect and emulsification of water/oil are the main reasons for the reduction in film thickness. Once a water droplet enters an oil reservoir around the critical contact zone, it hardly moves away. This aggravates starvation, reduces the center film thickness of the contact, and leads to lubrication failure of the mechanical components.

Keywords

free water dropletpoint contactstarved conditionfilm thickness

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Friction
Volume 10 Issue 3,
March 2022
Pages 388-397
DOI: 10.1007/s40544-020-0466-0

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LIU X, WANG J, HUANG L, et al. Direct observation of the impact of water droplets on oil replenishment in EHD lubricated contacts. Friction, 2022, 10(3): 388-397. https://doi.org/10.1007/s40544-020-0466-0

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Received: 15 May 2020
Revised: 26 August 2020
Accepted: 20 October 2020
Published: 26 January 2021
© The author(s) 2020

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