A Three-Dimensional Slip Velocity Model for Water-Lubricated Hydrodynamic Journal Bearings

Gu, Yuzhou; Cheng, Jinwu; Sun, Han‐Dong; Liang, Aibin; Cheng, Li

doi:10.3390/jmse10070927

Cited by 8 publications

(1 citation statement)

References 48 publications

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“…The slip coefficient is used in the general slip condition to describe the amount of slip that occurs at the slip surface. For non-wettable polymer material coatings, the value of the slip coefficient generally lies in the range of 5-10 μm [26][27][28]. Therefore, the value of the b 2 for the bearing surface is taken as 9 μm.…”

Section: Slip Boundary Modelmentioning

confidence: 99%

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: Slip Boundary Modelmentioning

confidence: 99%

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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Role of reinforcement on the tribological properties of polytetrafluoroethylene composites: A comprehensive review

Deshwal,

Belgamwar,

Bekinal

et al. 2024

Polymer Composites

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Polytetrafluoroethylene (PTFE) is widely used in tribological applications. However, it faces challenges due to its high wear rate. Reinforcement of additives in PTFE reduces its wear rate by up to 10,000 times in dry conditions. Infusing metallic filler materials like Al, Cu, and Pb improves PTFE wear performance but increases the coefficient of friction (COF). However, it may not be suitable for corrosive environments due to potential metal reactivity. Reinforcing PTFE composites with carbon‐based materials reduces weight, improves wear properties, and lowers COF. Pre‐treated materials enhance bonding for improved anti‐friction and anti‐wear properties. PTFE and its composites are widely used in journal bearings, bearing pads, and ball bearings due to their excellent low‐speed, low‐load lubrication properties. They outperform Babbitt alloy in bearing pads, except in heat conductivity. PTFE can also be used as a solid lubricant and can be combined with additives for improved performance. Apart from it, achieving an optimal combination of properties for all forms of reinforcement can be challenging due to the difficulty in determining exact values for multiple properties with specific types of reinforcement. This article provides a comprehensive review that delves into the significant findings pertaining to reinforcement and its application in bearing technology.Highlights Metals and carbon‐based fillers improve tribo‐properties. Polytetrafluoroethylene (PTFE) provides lubrication and thermal stability to the polymeric materials. Estimation of tribo‐thermal properties in combination is a challenge. Testing conditions greatly impact PTFE composites performance. PTFE as a solid lubricant suitable for low‐speed/load applications.

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Performance Optimization of a Multi-groove Water Lubricated Journal Bearing with Partial Slip by Taguchi Analysis

Ganesha,

Joseph,

Pai

et al. 2023

Arab J Sci Eng

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The importance of preserving the ecological balance has paved the way for developing water lubricated bearings for marine vessels and other various applications. These bearings have found widespread applications in high pressure water pumps, water-power plants and power generation stations in sea, mining industries, ships, boats and submarines. To investigate the performance envelope of a water lubricated journal bearing (WLJB) with partial slip/no slip pattern, a multi-groove bearing model is developed and analyzed using CFD in the present study. Taguchi analysis method is utilized to determine the highest influential parameter affecting the pressure distribution and load-carrying capacity of a water lubricated journal bearing. From Taguchi method, optimum values identified for design parameters such as attitude angle, groove angle, groove height and number of grooves are 60°, 9°, 7 mm and 2, respectively. For the optimum combination model, a higher load bearing capacity of 1484.5 N is attained. Approximately, 2.88 times increase in peak pressures are noted from the current optimal bearing model by comparing with previous findings. Results indicated that the number of grooves and groove angle are the most influential parameters affecting the bearing load capacity. Partial slip conditions are applied at the grooved surfaces of a bearing model designed based on the identified optimal groove parameters. Influence of varying slip intensity on bearing load capacity is analyzed using CFD simulation. Appropriate selection of slip regions and slip amplitude is found to play a major role influencing the performance of the water lubricated journal bearing.

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A Three-Dimensional Slip Velocity Model for Water-Lubricated Hydrodynamic Journal Bearings

Cited by 8 publications

References 48 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

Role of reinforcement on the tribological properties of polytetrafluoroethylene composites: A comprehensive review

Performance Optimization of a Multi-groove Water Lubricated Journal Bearing with Partial Slip by Taguchi Analysis

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