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Numerical investigation of the tribological performance of micro-dimple textured surfaces under hydrodynamic lubrication

Surface texturing is an important approach for controlling the tribological behavior of friction pairs used in mechanical and biological engineering. In this study, by utilizing the method of three-dimensional computational fluid dynamics (CFD) simulation, the lubrication model of a friction pair wi...

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Autores principales: Li, Kangmei, Jing, Dalei, Hu, Jun, Ding, Xiaohong, Yao, Zhenqiang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Beilstein-Institut 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5687009/
https://www.ncbi.nlm.nih.gov/pubmed/29181289
http://dx.doi.org/10.3762/bjnano.8.232
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author Li, Kangmei
Jing, Dalei
Hu, Jun
Ding, Xiaohong
Yao, Zhenqiang
author_facet Li, Kangmei
Jing, Dalei
Hu, Jun
Ding, Xiaohong
Yao, Zhenqiang
author_sort Li, Kangmei
collection PubMed
description Surface texturing is an important approach for controlling the tribological behavior of friction pairs used in mechanical and biological engineering. In this study, by utilizing the method of three-dimensional computational fluid dynamics (CFD) simulation, the lubrication model of a friction pair with micro-dimple array was established based on the Navier–Stokes equations. The typical pressure distribution of the lubricant film was analyzed. It was found that a positive hydrodynamic pressure is generated in the convergent part of the micro-dimple, while a negative hydrodynamic pressure is generated in the divergent part. With suitable parameters, the total integration of the pressure is positive, which can increase the load-carrying capacity of a friction pair. The effects of the micro-dimple parameters as well as fluid properties on tribological performance were investigated. It was concluded that under the condition of hydrodynamic lubrication, the main mechanism for the improvement in the tribological performance is the combined effects of wedging and recirculation. Within the range of parameters investigated in this study, the optimum texture density is 13%, while the optimum aspect ratio varies with the Reynolds number. For a given Reynolds number, there exists a combination of texture density and aspect ratio at which the optimum tribological performance could be obtained. Conclusions from this study could be helpful for the design of texture parameters in mechanical friction components and even in artificial joints.
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spelling pubmed-56870092017-11-27 Numerical investigation of the tribological performance of micro-dimple textured surfaces under hydrodynamic lubrication Li, Kangmei Jing, Dalei Hu, Jun Ding, Xiaohong Yao, Zhenqiang Beilstein J Nanotechnol Full Research Paper Surface texturing is an important approach for controlling the tribological behavior of friction pairs used in mechanical and biological engineering. In this study, by utilizing the method of three-dimensional computational fluid dynamics (CFD) simulation, the lubrication model of a friction pair with micro-dimple array was established based on the Navier–Stokes equations. The typical pressure distribution of the lubricant film was analyzed. It was found that a positive hydrodynamic pressure is generated in the convergent part of the micro-dimple, while a negative hydrodynamic pressure is generated in the divergent part. With suitable parameters, the total integration of the pressure is positive, which can increase the load-carrying capacity of a friction pair. The effects of the micro-dimple parameters as well as fluid properties on tribological performance were investigated. It was concluded that under the condition of hydrodynamic lubrication, the main mechanism for the improvement in the tribological performance is the combined effects of wedging and recirculation. Within the range of parameters investigated in this study, the optimum texture density is 13%, while the optimum aspect ratio varies with the Reynolds number. For a given Reynolds number, there exists a combination of texture density and aspect ratio at which the optimum tribological performance could be obtained. Conclusions from this study could be helpful for the design of texture parameters in mechanical friction components and even in artificial joints. Beilstein-Institut 2017-11-06 /pmc/articles/PMC5687009/ /pubmed/29181289 http://dx.doi.org/10.3762/bjnano.8.232 Text en Copyright © 2017, Li et al. https://creativecommons.org/licenses/by/4.0https://www.beilstein-journals.org/bjnano/termsThis is an Open Access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The license is subject to the Beilstein Journal of Nanotechnology terms and conditions: (https://www.beilstein-journals.org/bjnano/terms)
spellingShingle Full Research Paper
Li, Kangmei
Jing, Dalei
Hu, Jun
Ding, Xiaohong
Yao, Zhenqiang
Numerical investigation of the tribological performance of micro-dimple textured surfaces under hydrodynamic lubrication
title Numerical investigation of the tribological performance of micro-dimple textured surfaces under hydrodynamic lubrication
title_full Numerical investigation of the tribological performance of micro-dimple textured surfaces under hydrodynamic lubrication
title_fullStr Numerical investigation of the tribological performance of micro-dimple textured surfaces under hydrodynamic lubrication
title_full_unstemmed Numerical investigation of the tribological performance of micro-dimple textured surfaces under hydrodynamic lubrication
title_short Numerical investigation of the tribological performance of micro-dimple textured surfaces under hydrodynamic lubrication
title_sort numerical investigation of the tribological performance of micro-dimple textured surfaces under hydrodynamic lubrication
topic Full Research Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5687009/
https://www.ncbi.nlm.nih.gov/pubmed/29181289
http://dx.doi.org/10.3762/bjnano.8.232
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