Analysis of slider and journal bearing using partially textured slip surface

Rao, T. V. V. L. N.; Rani, Ahmad Majdi Abdul; Nagarajan, T.; Hashim, Fakhruldin Mohd

doi:10.1016/j.triboint.2012.06.010

Cited by 68 publications

(44 citation statements)

References 16 publications

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“…At a small wall slip and small range of shear rate, some experimental observations [32][33] fit very closely to the slip length model. However, at high shear rate, some other experimental results [17,34] show that the slip velocity increases in a strong nonlinear manner with the shear rate, thus wall slip can be described approximately by the critical shear stress model [27].…”

Section: Introductionmentioning

confidence: 56%

“…The primary parameters of the lubricated sliding contact are given as follows: sliding velocity U is 1 m/s (the corresponding Reynolds number R e is 1 [23,25,29,31,33], and the critical shear stresses range from 0 to 1,000 Pa, reasonable values based on literature [34][35][36][37][38]. All parameters and the range in which they are varied for all cases investigated in the present study are summarized in Table 1.…”

Section: Resultsmentioning

confidence: 98%

“…Early studies [33,34] have found experimental evidence of boundary slip occurring at a liquid-solid interface. During the past decade, with the development of advanced experimental techniques, numerous experiments have shown that boundary slip can occur at both a hydrophobic surface [14,18,[35][36][37][38] and a hydrophilic surface [15,16,38,39].…”

Section: Slip Modelsmentioning

confidence: 99%

“…Following the usual approach to derive the Reynolds equation from the Navier-Stokes equation by assuming the classical assumption except that now slip is allowed, one obtains the following modified Reynolds equation. 33 6…”

Section: Modified Reynolds Equation With Slip Boundarymentioning

confidence: 99%

“…Aurelian et al [32] studied the influence of texture and wall slippage in hydrodynamic bearings. In a recent publication, Rao et al [33] evaluated the effects of texture/slippage configuration on improvement in load support and reduction in friction coefficient for partially textured slippage slider and journal bearing. Even though major progress has been made in the lubrication of textured slippage surfaces, the majority of work is still based on the Reynolds equation, which means that the inertia-less approach was employed in their model.…”

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: Introductionmentioning

confidence: 56%

Section: Resultsmentioning

confidence: 98%

Section: Slip Modelsmentioning

confidence: 99%

Section: Modified Reynolds Equation With Slip Boundarymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Lubricated MEMS: effect of boundary slippage and texturing

Tauviqirrahman¹

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Effect of sliding speed on the thermohydrodynamic performance of partially slip‐textured slider bearings

Singh

Kango

2023

Lubrication Science

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The present study evaluates the combined use of micro‐textures and ‘wettability gradient’ on the thermohydrodynamic performance of inclined slider bearings. Mass conserving Elrod cavitation model with slip boundary condition has been used to investigate the dimensionless static performance parameters at different convergence ratios and sliding speeds. The most effective location of the wettability gradient and textures has been considered in the present work. It has been observed that with the increase in sliding speed, the load carrying capacity, friction force and volumetric inflow rate of the slip‐textured bearings were improved. The improvements were more pronounced at smaller convergence ratios. Moreover, the slip‐textured bearings exhibited significant improvement in the average pressure and temperature of the lubricant. However, at higher sliding speeds, a substantial increase in friction force and average lubricant temperature was noticed. The square textured slip bearing exhibited maximum improvements towards various performance parameters of the three considered texture shapes.

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Coupling effect of partial composite texture and thermal effect on the performance of hydrostatic bearing

Chen,

Cui,

Sun

et al. 2024

Lubrication Science

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This work is focused on performance computation of high speed rotor bearing system with partial composite texture. Since its viscosity at varying speeds affects working performance in different partial composite texture, therefore at design and development stage, it is necessary to know the composite texture and thermal effect acting on rotor‐bearing system that causes variation of performance. The effects of partial composite texture size and position on the performance of the bearing are studied. After the optimal structural parameters are determined, the effects of the partial composite texture and fluid thermos structure coupling on the bearing capacity, stiffness, and friction coefficient of the oil film are analysed. The results show that after considering the influence of thermal effect, the performance enhancement of composite texture bearing is better than that of smooth bearing. Considering the temperature effect, the bearing capacity of the composite textured bearing is increased by 51.4% compared with that of the smooth bearing, and the friction coefficient is reduced to 22.4%, which is better than the value without considering the temperature effect, the accuracy of the results is verified by experiments. This study provides a theoretical basis for the design of hydrostatic bearing and improving its performance.

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Analysis of slider and journal bearing using partially textured slip surface

Cited by 68 publications

References 16 publications

Lubricated MEMS: effect of boundary slippage and texturing

Lubricated MEMS: effect of boundary slippage and texturing

Effect of sliding speed on the thermohydrodynamic performance of partially slip‐textured slider bearings

Coupling effect of partial composite texture and thermal effect on the performance of hydrostatic bearing

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