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Lubricants 2018, 6(3), 75; https://doi.org/10.3390/lubricants6030075

Cavitation Growth Phenomena in Pure-Sliding Grease EHD Contacts

1
Division of Mechatronics, Department of Innovative Engineering, Faculty of Science and Technology, Oita University, 700 Dannoharu, Oita 870-1192, Japan
2
Department of Engineering and Design, University of Sussex, Brighton BN1 9RH, UK
3
International Institute for Carbon-Neutral Energy Research, Kyushu University, Fukuoka 819-0395, Japan
*
Author to whom correspondence should be addressed.
Received: 14 July 2018 / Revised: 17 August 2018 / Accepted: 20 August 2018 / Published: 22 August 2018
(This article belongs to the Special Issue Fluid-Film Lubrication)
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Abstract

This article describes experimental and theoretical studies on the cavitation phenomena in the grease lubrication film under pure sliding elastohydrodynamic contact. In situ observation tests using the optical interferometry technique were conducted, and the growth of cavitation was captured using a high-speed camera. The results showed that the cavity grew in two stages, which was similar to the behavior in the base oil, and that the cavity growth rate in the initial stage was higher than that in the second stage. In the initial stage, the cavity growth time in the grease was longer than that in the base oil, and the cavity length after the growth depended on the base oil viscosity. It was also found in the test using diurea grease that small cavities were formed by the lumps of thickener. The cavity growth in the initial stage was discussed by numerical simulation of pressure distribution based on a simple rheological model. View Full-Text
Keywords: cavitation; elastohydrodynamic lubrication; grease; rheology; gas cavitation; elastohydrodynamic lubrication; grease; rheology; gas
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Otsu, T.; Glovnea, R.; Sugimura, J. Cavitation Growth Phenomena in Pure-Sliding Grease EHD Contacts. Lubricants 2018, 6, 75.

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