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  Regimes of soft lubrication

Essink, M. H., Pandey, A., Karpitschka, S., Venner, C. H., & Snoeijer, J. H. (2021). Regimes of soft lubrication. Journal of Fluid Mechanics, 915: A49. doi:10.1017/jfm.2021.96.

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Essink, Martin H., Author
Pandey, Anupam, Author
Karpitschka, Stefan1, Author              
Venner, Cornelis H., Author
Snoeijer, Jacco H., Author
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1Group Fluidics in heterogeneous environments, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2466703              

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 Abstract: Elastohydrodynamic lubrication, or simply soft lubrication, refers to the motion of deformable objects near a boundary lubricated by a fluid, and is one of the key physical mechanisms to minimise friction and wear in natural and engineered systems. Hence, it is of particular interest to relate the thickness of the lubricant layer to the entrainment (sliding/rolling) velocity, the mechanical loading exerted onto the contacting elements and the properties of the elastic boundary. In this work, we provide an overview of the various regimes of soft lubrication for two-dimensional cylinders in lubricated contact with compliant walls. We discuss the limits of small and large entrainment velocity, which are equivalent to large and small elastic deformations, as the cylinder moves near thick or thin elastic layers. The analysis focusses on thin elastic coatings, both compressible and incompressible, for which analytical scaling laws are not yet available in the regime of large deformations. By analysing the elastohydrodynamic boundary layers that appear at the edge of the contact, we establish the missing scaling laws – including prefactors. As such, we offer a rather complete overview of the physically relevant limits of soft lubrication.

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 Dates: 2021-03-152021
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
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 Identifiers: DOI: 10.1017/jfm.2021.96
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Title: Journal of Fluid Mechanics
Source Genre: Journal
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Pages: 23 Volume / Issue: 915 Sequence Number: A49 Start / End Page: - Identifier: ISSN: 0022-1120
ISSN: 1469-7645