Modified Reynolds Equations for High Viscosity Surface Layer and Thin Film Lubrication Analysis of Tapered/Tapered Land Bearings as Models of Surface Texture

The development of thin film lubrication theory is vital for future micro-textured lubrication technologies. Therefore, a modified Reynolds equation was derived in this research by incorporating the variable viscosity effect in a tribochemical adsorbed layer. The modified factors of the Reynolds equ...

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Autor principal:	Kyosuke Ono
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2019
Materias:	modified reynolds equation thin film lubrication tribochemical layer high viscosity surface layer surface texture super low friction coefficient tapered bearing tapered land bearing Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/85198bcffb9e4e8f8166ae586735f01e
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spelling	oai:doaj.org-article:85198bcffb9e4e8f8166ae586735f01e2021-11-05T09:17:25ZModified Reynolds Equations for High Viscosity Surface Layer and Thin Film Lubrication Analysis of Tapered/Tapered Land Bearings as Models of Surface Texture1881-219810.2474/trol.14.267https://doaj.org/article/85198bcffb9e4e8f8166ae586735f01e2019-12-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/14/5/14_267/_pdf/-char/enhttps://doaj.org/toc/1881-2198The development of thin film lubrication theory is vital for future micro-textured lubrication technologies. Therefore, a modified Reynolds equation was derived in this research by incorporating the variable viscosity effect in a tribochemical adsorbed layer. The modified factors of the Reynolds equation were expressed as closed form functions for a one-sided viscosity function determined from the measured effective viscosity. Using the one-dimensional modified Reynolds equation, the load capacity and friction coefficients of micro-tapered/tapered land bearings as texture models were numerically investigated. By performing a parametric study with different viscosity ratios (10 and 100), taper lengths (10, 50, and 250 µm), taper angles, and land length ratios and a surface layer thickness of 10-nm, it was found that a high load capacity and an extremely low friction coefficient of less than 10–4 on the stationary surface could be achieved with a bearing gap of a few tens of nanometers. Since the surface height irregularities between the textures can be compensated for by the elastic deformation caused by high pressures, the lubrication regime in a parallel textured slider can be realized if the roughness heights on the mating surfaces are reduced to less than the bearing gap, using the running-in process.Kyosuke OnoJapanese Society of Tribologistsarticlemodified reynolds equationthin film lubricationtribochemical layerhigh viscosity surface layersurface texturesuper low friction coefficienttapered bearingtapered land bearingPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 14, Iss 5, Pp 267-278 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	modified reynolds equation thin film lubrication tribochemical layer high viscosity surface layer surface texture super low friction coefficient tapered bearing tapered land bearing Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	modified reynolds equation thin film lubrication tribochemical layer high viscosity surface layer surface texture super low friction coefficient tapered bearing tapered land bearing Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Kyosuke Ono Modified Reynolds Equations for High Viscosity Surface Layer and Thin Film Lubrication Analysis of Tapered/Tapered Land Bearings as Models of Surface Texture
description	The development of thin film lubrication theory is vital for future micro-textured lubrication technologies. Therefore, a modified Reynolds equation was derived in this research by incorporating the variable viscosity effect in a tribochemical adsorbed layer. The modified factors of the Reynolds equation were expressed as closed form functions for a one-sided viscosity function determined from the measured effective viscosity. Using the one-dimensional modified Reynolds equation, the load capacity and friction coefficients of micro-tapered/tapered land bearings as texture models were numerically investigated. By performing a parametric study with different viscosity ratios (10 and 100), taper lengths (10, 50, and 250 µm), taper angles, and land length ratios and a surface layer thickness of 10-nm, it was found that a high load capacity and an extremely low friction coefficient of less than 10–4 on the stationary surface could be achieved with a bearing gap of a few tens of nanometers. Since the surface height irregularities between the textures can be compensated for by the elastic deformation caused by high pressures, the lubrication regime in a parallel textured slider can be realized if the roughness heights on the mating surfaces are reduced to less than the bearing gap, using the running-in process.
format	article
author	Kyosuke Ono
author_facet	Kyosuke Ono
author_sort	Kyosuke Ono
title	Modified Reynolds Equations for High Viscosity Surface Layer and Thin Film Lubrication Analysis of Tapered/Tapered Land Bearings as Models of Surface Texture
title_short	Modified Reynolds Equations for High Viscosity Surface Layer and Thin Film Lubrication Analysis of Tapered/Tapered Land Bearings as Models of Surface Texture
title_full	Modified Reynolds Equations for High Viscosity Surface Layer and Thin Film Lubrication Analysis of Tapered/Tapered Land Bearings as Models of Surface Texture
title_fullStr	Modified Reynolds Equations for High Viscosity Surface Layer and Thin Film Lubrication Analysis of Tapered/Tapered Land Bearings as Models of Surface Texture
title_full_unstemmed	Modified Reynolds Equations for High Viscosity Surface Layer and Thin Film Lubrication Analysis of Tapered/Tapered Land Bearings as Models of Surface Texture
title_sort	modified reynolds equations for high viscosity surface layer and thin film lubrication analysis of tapered/tapered land bearings as models of surface texture
publisher	Japanese Society of Tribologists
publishDate	2019
url	https://doaj.org/article/85198bcffb9e4e8f8166ae586735f01e
work_keys_str_mv	AT kyosukeono modifiedreynoldsequationsforhighviscositysurfacelayerandthinfilmlubricationanalysisoftaperedtaperedlandbearingsasmodelsofsurfacetexture
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Modified Reynolds Equations for High Viscosity Surface Layer and Thin Film Lubrication Analysis of Tapered/Tapered Land Bearings as Models of Surface Texture

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