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Interplay between wall slip and cavitation: A complementary variable approach

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Title: Interplay between wall slip and cavitation: A complementary variable approach
Authors: Biancofiore, L
Giacopini, M
Dini, D
Item Type: Journal Article
Abstract: In this work a stable and reliable numerical model based on complementary variables is developed to study lubricated contacts characterised by slip at one or both surfaces and in the presence of cavitation. This model can be used to predict surface behaviour when cavitation induced by e.g. the presence of surface texture, slip, or a combination of the two is encountered, with varying surface parameters. For this purpose, two different algorithms are coupled to predict the formation of cavitation, through a mass-conserving formulation, and the presence of slip at the wall. The possible slippage is described by a limiting shear criterion formulated using a Tresca model. To show the flexibility of our model, several bearing geometries have been analysed, such as a twin parabolic slider, a cosine profile used to mimic a bearing, and a pocketed slider bearing employed to study the effect of surface texture. We observe that the lubrication performance (i.e. low friction coefficient) can be improved by using materials that promote slippage at the moving wall. The location of the slippage region can be optimised to find the lowest value of friction coefficient. Our theoretical developments and numerical implementation are shown to produce useful guidelines to improve and optimise the design of textured superoleophobic surfaces in the presence of lubricated contacts.
Issue Date: 1-Sep-2019
Date of Acceptance: 24-Apr-2019
URI: http://hdl.handle.net/10044/1/70463
DOI: https://dx.doi.org/10.1016/j.triboint.2019.04.040
ISSN: 0301-679X
Publisher: Elsevier
Start Page: 324
End Page: 339
Journal / Book Title: Tribology International
Volume: 137
Copyright Statement: © 2019 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/N025954/1
Keywords: 0913 Mechanical Engineering
Mechanical Engineering & Transports
Publication Status: Published
Online Publication Date: 2019-05-04
Appears in Collections:Mechanical Engineering
Faculty of Natural Sciences