Effects of groove textures on fully lubricated sliding with cavitation

Shi, Xi; Ni, Ting

doi:10.1016/j.triboint.2011.08.018

Cited by 76 publications

(61 citation statements)

References 22 publications

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“…One noteworthy observation is that in using such a configuration, the pressure distribution (and thus the load support) is higher compared to the conventional bearing with no-slip, especially if the uniform film thickness is employed. This is also reported in a later paper [31].…”

Section: Previous Studies In Hydrodynamic Lubrication With Slipsupporting

confidence: 83%

“…In this model, slip is envisaged to occur only when a critical surface shear stress is reached, and once slip begins, it takes place at a constant slip length. It was also shown that this slip model was able to reconcile results from different experimental investigations [31]. Salant and Fortier [29] conducted a numerical analysis of a finite slider bearing with an engineered complex slip surface and found that such a bearing can provide a high load support in combination with low friction.…”

Section: Introductionmentioning

confidence: 90%

“…The modified form of the Reynolds equation presented here is different from that used in the studies presented previously [25][26][27][28][29][30][31][32]68]. The developed model includes the critical shear stress terms and the possibility of slip that may occur on both moving surfaces.…”

Section: Modified Reynolds Equationmentioning

confidence: 99%

“…This is because the hydrodynamic behavior of lubricated contacts is mainly governed by the boundary conditions of the lubricant that provide lubrication. From the numerical point of view, there are two main wall slip models which have 3 been adopted to describe the slip boundary, that is, the slip length model [23][24][25][26] and the critical shear stress model [27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

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Lubricated MEMS: effect of boundary slippage and texturing

Tauviqirrahman¹

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SummaryMany types of micro-electro-mechanical-system (MEMS) based products are currently employed in a variety of applications. Recently, there has been an increase in the demand for higher reliability of MEMS which incorporate moving parts for each intended application. This is because the reliability of MEMS containing moving parts is poor and has a limited lifetime. Applying a lubricant to these systems to avoid wear hampers the movement due to the adhesive/surface forces, leading to stiction. By modifying the contacting surfaces, one is able to enhance the behavior of surfaces in a controlled way and thus alter the flow pattern in the liquid lubricating film for an enhanced performance. In this thesis, the concept of complex slip surface (CSS) as an artificial (deterministic) boundary slip surface is introduced. The thesis examines the exploitation of the artificial boundary slip to improve the performance of liquid lubricated-MEMS, with the emphasis on increasing the load support and reducing the coefficient of friction. Therefore, it is of great importance to get a clear view of the concept of the artificial boundary slip with respect to the performance of lubricated-MEMS.A main principle of fluid film lubrication, as well as a touchstone of the Reynolds equation, is that there is no boundary slip of the liquid lubricant along the two solid surfaces. As a result, lubrication with boundary slip cannot be analyzed by the classical Reynolds equation, which specifically excludes the possibility of slip. The aim of the present work is to build a modified form of the Reynolds equation in which boundary slip is allowed to occur on both of the opposing surfaces. Two different models of boundary slip are discussed, namely: the two-component slip model and the critical shear stress model. The first model assumes that boundary slip will occur when the shear stress at the surface reaches a critical value, and, once the slip begins, that it takes place at a constant slip length. This model is adopted to incorporate some possible slip directions, as well as slip velocities directly.The second model, the critical shear stress model, is based on the assumption that there is a critical shear stress on the liquid-solid interface. No slip occurs at the interface if the surface shear stress is less than the critical shear stress, but the slip takes place if the shear stress reaches the point of critical shear stress. The modified Reynolds equation with the critical shear stress model that was developed in the current work is based on the assumption that a slip is treated to occur both at the stationary and the moving surface. The model is converted to a finite volume form and solved by tri-diagonal-matrix-algorithm (TDMA) combined with alternating-direction-implicit (ADI) scheme. In this way, the model is able to incorporate the influence of boundary slip on the lubrication performance of MEMS, while keeping the computational time within a reasonable range. The model is validated through experimental work published in the lit...

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Section: Previous Studies In Hydrodynamic Lubrication With Slipsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 90%

Section: Modified Reynolds Equationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Lubricated MEMS: effect of boundary slippage and texturing

Tauviqirrahman¹

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“…Some topographical and lateral geometric properties of the cylinder bores affect considerably the functional performances of the ring-pack contact, particularly, the crosshatch angle [14][15][16][17][18], superficial plateau roughness [19,20] and the valley and surface patterns depth [14] and density [14]. It believed that liner surfaces that have smaller valleys and smoother plateaus would reduce friction and oil consumption [9].…”

Section: Introductionmentioning

confidence: 99%

Mutual influence of crosshatch angle and superficial roughness of honed surfaces on friction in ring-pack tribo-system

Mezghani

Demirci

Yousfi

et al. 2013

Tribology International

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A study of surface texturing and boundary slip on improving the load support of lubricated parallel sliding contacts

et al. 2012

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Currently, there is a great interest in the use of engineered complex slip surfaces as well as the surface texturing because these surfaces are able to improve the tribological performance of lubricated contacts. In this paper, based on the modified Reynolds equation, a systematic comparison is made with various surface conditions, that is, texturing, slip, and the combination of those configurations with respect to the performance of flat classical (no-slip) contact. Optimum values of design parameters (slip length, slip zone, texture cell aspect ratio, and texturing zone), allowing for maximum load support, are presented. In the case of combined texture/slip pattern, it is shown that the load support does not practically depend on the texture cell aspect ratio. The slip effect has a much higher contribution in inducing the pressure distribution than the texturing effect. It is also demonstrated that partial texturing gives a better improvement than full texturing. However, compared to a flat complex slip surface, a partially textured surface is still less efficient to enhance the load support, even if this textured configuration is combined with a slip condition.

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Effects of groove textures on fully lubricated sliding with cavitation

Cited by 76 publications

References 22 publications

Lubricated MEMS: effect of boundary slippage and texturing

Lubricated MEMS: effect of boundary slippage and texturing

Mutual influence of crosshatch angle and superficial roughness of honed surfaces on friction in ring-pack tribo-system

A study of surface texturing and boundary slip on improving the load support of lubricated parallel sliding contacts

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