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With the development of surface precision machining technology and numerous studies on lubrication and friction reduction, the application of surface textures to achieve friction reduction has attracted extensive attention, but few studies have considered the influence of surface roughness on lubrication characteristics. By employing the computational fluid dynamics (CFD) simulation method, the lubrication models with rectangular textures and the introduction of rough asperity structures at the same time were established. The effects of the corresponding structure parameters on the lubrication performance of textured and roughed surfaces were studied under water lubrication conditions. Our results suggest that the adjustment of geometric parameters on the micro-/nano-structured surfaces could influence the bearing capacity of the water lubrication film, thus affecting the hydrodynamic lubrication performance on the surface. In addition, the generation of vortex in the micro-textures could bring changes in vorticity, which causes energy dissipation and affects frictional forces. In the lubrication model with rectangular textures, optimal hydrodynamic lubrication performance was obtained under the appropriate depth ratio at H=0.6. Meanwhile, the corresponding lubrication performance could be enhanced by increasing the width ratio (W) of surface textures. After introducing random asperity structures on the micro-textured surfaces with a standard deviation value of δ=0.5, the carrying capacity increased by 44%, and the friction coefficient decreased by 30.9%. Moreover, the introduction of half-sine rough asperity structures could only result in relatively minor differences in the lubrication performance, i.e., the changes in the bearing capacity and friction coefficient are less than 10%. However, the introduction of compound hierarchical structures consisting of random asperity structures and half-sine rough asperity structures could result in an increase in the corresponding bearing capacity by 42% and a reduction in friction coefficient (31.1%), which implies a significant enhancement in the hydrodynamic lubrication performance.
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Keywords:
- Surface texture /
- Roughness /
- Hydrodynamic lubrication /
- Computational fluid dynamics simulation
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