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Lubricant flow in thin-film elastohydrodynamic contact under extreme conditions

Abstract

To further extend knowledge about fluid film friction in elastohydrodynamic contact, it is important to examine how lubricant flows. In this paper, several film thickness results obtained by interferometry technique for different kinds of experiments were analyzed and discussed based on lubricant flow continuity. Results of two steady-state and two transient experiments are presented. Possible speed profiles that can explain observed film thickness distributions were suggested. It is shown that major part of present experiments can be explained by a single speed profile known as a plug flow. This finding is in contradiction to usual linear speed profile predicted by Reynolds equation.

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Acknowledgement

The research leading to these results has received funding from the Ministry of Education, Youth and Sports of Czech Republic under the National Sustainability Program I (Project LO1202).

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Correspondence to P. Sperka.

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This article is published with open access at Springerlink.com

Petr SPERKA. He received his M.S. and Ph.D. degrees in mechanical engineering from Brno University of Technology, Czech Republic, in 2007 and 2011, respectively. His current position is an assistant professor and head of Elastohydrodynamic Lubrication Section at Tribology Group, Institute of Machine and Industrial Design, Faculty of Mechanical Engineering, Brno University of Technology. His research areas cover the boundary, mixed and elastohydrodynamic lubrication, roughness effect, and lubricant rheology.

Ivan KRUPKA. He received his M.S. and Ph.D. degrees in mechanical engineering from Brno University of Technology, Czech Republic, in 1990 and 1997, respectively. His current position is a professor and head of Tribology Group, Institute of Machine and Industrial Design, Faculty of Mechanical Engineering, Brno University of Technology. His research areas cover the mixed and elastohydrodynamic lubrication, surface texturing effect, and lubricant rheology.

Martin HARTL. He received his M.S. and Ph.D. degrees in mechanical engineering from Brno University of Technology, Czech Republic, in 1990 and 1997, respectively. His current position is a professor and head of Institute of Machine and Industrial Design, Faculty of Mechanical Engineering, Brno University of Technology. His research areas cover the boundary, mixed and elastohydrodynamic lubrication, roughness effect, and biotribology.

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Open Access: The research leading to these results has received funding from the Ministry of Education, Youth and Sports of Czech Republic under the National Sustainability Program I (Project LO1202).

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Sperka, P., Krupka, I. & Hartl, M. Lubricant flow in thin-film elastohydrodynamic contact under extreme conditions. Friction 4, 380–390 (2016). https://doi.org/10.1007/s40544-016-0134-6

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Keywords

  • fluid film friction
  • speed profile
  • flow rate continuity
  • lubricant rheology
  • plug flow