Abstract
In order to understand the effect of surface texturing parameters on the frictional behavior of textured surfaces and to correlate results of different lubrication regimes, Computational Fluid Dynamics (CFD) numerical analysis of the fluid flow was performed for four different textured surface geometries. The aim of the present research paper is to get theoretical background for the frictional behavior of textured surfaces under hydrodynamic lubrication. Since it is unrealistic to make a direct analysis of a real problem that can possess more than several thousand micro-dimples, the purpose is then to investigate the flow in single cells of periodical micro-dimple patterns and to extract useful conclusions for the lubrication’s framework. Among all geometries studied, optimum geometry shapes in terms of hydrodynamic performance were reported. It was found that the best hydrodynamic performance was achieved with the rectangular geometry (lowest shear force).
Highlights
In order to investigate in detail the effect of different texturing parameters and to get correlation with experimental results, computational fluid dynamic analysis (CFD) was carried out [18,19]
Contact under full film lubrication was modeled through computational fluid dynamics (CFD) using FLUENT v6.3
Strong similarities between Computational Fluid Dynamics (CFD) analysis of textured surfaces presented in this study and results valid when contact is under full film lubrication
Summary
The purpose of lubrication is to generate a separating force between two closely spaced surfaces separated by a fluid in relative motion in order to reduce friction and wear. The separation and load-carrying capacity are achieved by generating a pressure in the fluid film between the surfaces [1]. For a good understanding of lubrication theory, three different regimes must be considered: boundary lubrication, mixed lubrication and hydrodynamic lubrication. If a full lubricating film is separating the surfaces and there are no asperities in contact, this regime is denoted as hydrodynamic or full-film. Full film lubrication problems can be analyzed using the Reynolds equation to model the lubricant pressure and fluid flows, and the interaction between the lubricant and surfaces. Due to an increasing availability of user-friendly, commercial
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