Optimization design for slip/no-slip configuration of hydrophobic sliding bearings using Monte Carlo search

Zhang, Wenxin; Zhu, Bo

doi:10.1016/j.triboint.2022.108034

Cited by 8 publications

(3 citation statements)

References 36 publications

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“…As discussed in the introduction section, the value of convergence ratios for maximum hydrodynamic lift generally lies between 1 and 1.4 [10][11][12][13][14]. Further, the slip region near the bearing inlet increases the lubricant pressure at the slip/no-slip interface ('wettability gradient'), which increases the LBC of the bearing [6,37]. Therefore, in the present work, square shape micro-textures with slip boundary are considered, and the value of K is taken as 1.2.…”

Section: Resultsmentioning

confidence: 98%

Thermohydrodynamic performance of convergent slider bearings using different placement of square micro-textures and slip boundary

Singh,

Kango

2024

Phys. Scr.

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The present numerical study investigates the thermohydrodynamic performance of inclined/convergent slider bearings using different placing of textures and slip region. Mass-conserving Elrod cavitation model with slip boundary is used to analyze the static performance variables. Due to better fluid retain-ability, Square-shaped micro-textures have been used. The slip coefficient for the slip boundary on the bearing surface is taken as 9 μm. As reported previously for convergent bearings, the optimal convergence ratio (K) value for maximum bearing performance lies between 1 and 1.4. Therefore, in the present paper, the value of K is taken as 1.2. It was observed that the location of micro-textures and slip boundary greatly influence the bearing performance. When textures and slip regions are placed near the inlet region of the bearing, with a reduction in shear stress and the availability of the lubricant near the inlet, the resistance to the lubricant flow reduces, increasing lubricant intake. Further, for partial slip bearing, an abrupt obstruction to the lubricant flow occurs at the location of the slip/no-slip interface, which increases the hydrodynamic pressure and improves the load bearing capacity of the bearing. Moreover, due to less friction observed, various slip-textured bearings showed a reduction in the average lubricant temperature compared to conventional bearing. In the end, an updated combined slip-textured bearing surface is presented for maximum bearing performance in terms of different performance variables. The findings of the current work would be helpful for researchers in selecting the optimum slip-textured surface for inclined slider bearings under the current operating conditions.

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Section: Resultsmentioning

confidence: 98%

Thermohydrodynamic performance of convergent slider bearings using different placement of square micro-textures and slip boundary

Singh,

Kango

2024

Phys. Scr.

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“…With the deepening of research on bearings, boundary slip has an increasing attention in the study of bearing performance. Zhang and Zhu (2023) developed a critical shear stress model based on the Monte Carlo method to simulate the bearing load capacity and tribological performance. By comparing the slip/no-slip configuration, it was found that the aspect ratio of the bearing has opposite effects on the slip zone with different objective optimization.…”

Section: Introductionmentioning

confidence: 99%

Slip flow and thermal characteristics in gas thrust bearings with rough surfaces

Xiong,

Xu,

Chen

2024

ILT

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Purpose This study aims to investigate the rarefaction effects on flow and thermal performances of an equivalent sand-grain roughness model for aerodynamic thrust bearing. Design/methodology/approach In this study, a model of gas lubrication thrust bearing was established by modifying the wall roughness and considering rarefaction effect. The flow and lubrication characteristics of gas film were discussed based on the equivalent sand roughness model and rarefaction effect. Findings The boundary slip and the surface roughness effect lead to a decrease in gas film pressure and temperature, with a maximum decrease of 39.2% and 8.4%, respectively. The vortex effect present in the gas film is closely linked to the gas film’s pressure. Slip flow decreases the vortex effect, and an increase in roughness results in the development of slip flow. The increase of roughness leads to a decrease for the static and thermal characteristics. Originality/value This work uses the rarefaction effect and the equivalent sand roughness model to investigate the lubrication characteristics of gas thrust bearing. The results help to guide the selection of the surface roughness of rotor and bearing, so as to fully control the rarefaction effect and make use of it.

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“…Following these studies, the bearing performance under the combined action of surface roughness and boundary slip was investigated [20][21][22]. The effects of slip parameters such as slip region location [23][24][25][26][27][28], slip region shape [29,30], slip region size [19,26,30,31], slip length [19,[32][33][34], slip coefficient [15,18,35], critical shear stress [28], and texture parameters [15,19,[26][27][28]30,32,34] on the performance of the tribo-pair were also studied, and the slip design of the bearings was optimised [26,27,30,[36][37][38]. Interesting conclusions can be drawn from this study.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of no-wear super-slip design of tribo-pair in load lifting and friction reduction

Hu¹,

Wang²,

Yang³

et al. 2023

Preprint

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The concept of “super-slip design” is used to investigate the influence of multiple factors on the opening and frictional forces of a tribo-pair with microscale grooves. The results demonstrate that significantly improving the load-carrying capacity and reducing the viscous friction can be simultaneously realised by super-slip modification of the bottom surface of the hydrodynamic groove as a result of the joint action of the super-slip surface, groove geometrical parameters, and operating conditions. This is expected to further enhance the load-carrying capacity and reduce friction by applying shear stress on the interface of the liquid film and superslippery surface of the groove bottom. The superslippery surface does not fail because of rubbing, and the logical relationship between the performance parameters and groove depth changes unusually under this design.

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Optimization design for slip/no-slip configuration of hydrophobic sliding bearings using Monte Carlo search

Cited by 8 publications

References 36 publications

Thermohydrodynamic performance of convergent slider bearings using different placement of square micro-textures and slip boundary

Thermohydrodynamic performance of convergent slider bearings using different placement of square micro-textures and slip boundary

Slip flow and thermal characteristics in gas thrust bearings with rough surfaces

Mechanism of no-wear super-slip design of tribo-pair in load lifting and friction reduction

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