Effect of surface texturing on hydrodynamic lubrication at various temperatures

Verma

Surf. Topogr.: Metrol. Prop.

et al. 2021

The purpose of this article is to present the physical insights behind the successful implementation of surface textures and coatings in fluid film bearing systems for improving the tribological performance. The article is a systematic review of previously published articles implementing textures and coatings to know tribology behind it. The fluid rheology is also equally important for improving the performance of the bearing systems. The main focus is to know the reasons that have been quoted in numerous research studies for fruitfulness of texturing and coatings. It has come into the notice that a number of experimental studies incorporating textures were reported by the researchers; however, a huge amount of numerical/theoretical studies have been presented. The evolution in lubricants research appreciably used for improving the tribological performance by the reduction of friction and wear. The combination of textures and lubricants has proven the unambiguous enhancement in the rate of performance. The collection of information regarding physical causes behind the benefits of surface texture and coatings is the real worth of this article. The work on coatings of bearings have also becoming the interest of researchers and have profound effects in enhancing the tribological performance of slider bearings.

Section: Newtonian Studiesmentioning

confidence: 92%

Qualitative potentials of surface textures and coatings in the performance of fluid-film bearings: a critical review

Verma

Surf. Topogr.: Metrol. Prop.

et al. 2021

“…In this way, the efficiency can be increased depending on the texture geometry by decreasing friction [116]. In lubricated conditions, the surface texture can increase hydrodynamic pressure, reducing friction and wear [115,117]. However, surface texturing effects are highly dependent on operating conditions, such as sliding speed or contact pressure [114].…”

Section: Surface Texturingmentioning

confidence: 99%

The Twelve Principles of Green Tribology: Studies, Research, and Case Studies—A Brief Anthology

et al. 2022

Sustainability has become of paramount importance, as evidenced by the increasing number of norms and regulations concerning various sectors. Due to its intrinsic trans-sectorial nature, tribology has drawn the attention of the supporters of sustainability. This discipline allows the environmental, economic, and social impacts to be decreased in a wide range of applications following the same strategies. In 2010, Nosonovsky and Bhushan drew up 12 approaches based on the 12 principles of green chemistry and the 12 principles of green engineering, defining the “12 principles of green tribology.” This review exploits the 12 principles of green tribology to fathom the developed research related to sustainability and tribology. Different approaches and innovative studies have been proposed in this short selection as references to consider for further development, pursuing the efforts of the scientific community for a sustainable future through the contribution also of tribosystems. The manuscript aims to provide practical examples of materials, lubricants, strategies, and technologies that have contributed to the overall progress of tribology, decreasing wear and friction and increasing efficiency, and at the same time promoting sustainable development, lowering toxicity, waste production, and loss of energy and resources.

Surf. Topogr.: Metrol. Prop.

“…They found that the texture can display a larger oil film thickness under high-speed and heavy-duty conditions, but did not consider the lubrication performance of the texture under mixed lubrication conditions. Gao et al [12] considered the thermal expansion of lubricating oil and compared the lubrication performance of textured surfaces and untextured surfaces in specific environments through experiments. They found that the lubrication performance of textured surfaces was better than that of smooth surfaces.…”

Section: Introductionmentioning

confidence: 99%

Study on the mixed lubrication of rough planar extrusion considering surface texture

Su,

Shao,

Tang

et al. 2024

Surface texture plays a crucial role in fluid dynamic lubrication. The non-Newtonian thermal elastohydrodynamic lubrication problem involving rough surfaces with texture has not been investigated to date. In this paper, a model for non-Newtonian thermal elastohydrodynamic lubrication incorporating rough surfaces and texture morphology is developed, focusing on the problem of mixed lubrication in planar extrusion with texture. The model builds upon the Reynolds equation with flow factor introduced. It considers the effects of rough surface texture, thermal effects, and non-Newtonian effects. The Reynolds equation is numerically solved using the Semi-System method to calculate the oil film pressure in full film region and contact pressure in dry contact area. The DC-FFT algorithm is employed to calculate surface elastic deformation. Comparing the calculated friction coefficient of the present model with the measured values in literature experiments, the average error is only 6.94%. Furthermore, the study investigates the effects of texture, temperature, and non-Newtonian on interfacial lubrication performance under mixed lubrication conditions. It’s found that compared to untextured surface, the average film thickness of textured surface increased by a maximum of 10.8%, and the friction coefficient decreased by a maximum of 67.4%; Compared to Newtonian fluids, shear thinning fluids reduce temperature by 0.18%, and shear thickening fluids are more conducive to improving mixed lubrication performance. A stepped pit texture is designed based on the dynamic pressure mechanism of the texture, indicating that the circular stepped pit texture has the best load-bearing capacity improvement.