Optimization of Pocket Geometry for Friction Reduction in Piston–Liner Contacts

Vlădescu, Sorin-Cristian; Ciniero, Alessandra; Tufail, Khizer; Gangopadhyay, Arup; Reddyhoff, Tom

doi:10.1080/10402004.2017.1363930

Cited by 29 publications

(22 citation statements)

References 38 publications

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“…The results confirm that lower texture heights proved superior in reducing friction coefficient, in particular for the optimum value of 5 µm, where all texture shapes show the minimum friction coefficient. In agreement with previous results, 63 the shallower textures show beneficial effects in reducing the friction coefficient. This is because the smaller texture heights generate additional hydrodynamic load support as compared to more considerable texture heights for all texture shapes (see Figure 12(b)).…”

Section: Resultssupporting

confidence: 93%

Experimental and numerical studies of positive texture effect on friction reduction of sliding contact under mixed lubrication

Peddakondigalla

Ismail

Ben

2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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Textured surfaces have been remarkable in improving the frictional performance of sliding contacts, particularly at instances such as boundary or mixed lubrication regimes. This article reports the results of an experimental and numerical study carried out by introducing surface textures in the form of protrusions to investigate its effects on friction performance under a mixed lubrication regime. The surface textures produced by the chemical etching process are tested on the pin on disc test rig by varying area density and height of the texture. In numerical simulation, the modified Reynolds equation (Patir–Cheng flow model) and asperity contact model (Greenwood–Tripp model) are solved for hydrodynamic and asperity pressures, respectively. The results indicate that the experimental measurements are qualitatively in good agreement with numerical predictions. Furthermore, the simulations are performed for different texture shapes by varying texture area density, height, and sliding velocity. The results depict that a maximum friction reduction of 87% with elliptical textures compared to the un-textured case.

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Section: Resultssupporting

confidence: 93%

Experimental and numerical studies of positive texture effect on friction reduction of sliding contact under mixed lubrication

Peddakondigalla

Ismail

Ben

2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Recent work at Imperial College [13,[31][32][33][34][35][36] has investigated a variety of surface texture geometries in a contact closely replicating an automotive piston ring-cylinder liner pair. The relationship between the friction reduction capability of surface texture and lubrication regime was characterised in [13] for a variety of textured shapes, while in [35,37] rules for the optimum pocket width, depth and spacing was established for the best performing shape determined previously (i.e. rectangular pockets orient normal to the direction of sliding, so as to be completely entrapped inside the contact).…”

Section: Surface Texturementioning

confidence: 99%

Looking into a laser textured piston ring-liner contact

Vlădescu

Ciniero

Tufail

et al. 2017

Tribology International

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“…have potential benefits, and improved design of piston-rings contacts have been proposed based on this evidence [11,12] The universally accepted no-slip condition is nothing more than an approximation that holds experimentally only under normal flow conditions [13]. Recent works have shown that surface engineering, particularly superhydrophobic surfaces, can be used to modify the no-slip condition, i.e.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Interplay between wall slip and cavitation: A complementary variable approach

Biancofiore

Giacopini

Dini

2019

Tribology International

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In this work a stable and reliable numerical model based on complementary variables is developed to study lubricated contacts characterised by slip at one or both surfaces and in the presence of cavitation. This model can be used to predict surface behaviour when cavitation induced by e.g. the presence of surface texture, slip, or a combination of the two is encountered, with varying surface parameters. For this purpose, two different algorithms are coupled to predict the formation of cavitation, through a mass-conserving formulation, and the presence of slip at the wall. The possible slippage is described by a limiting shear criterion formulated using a Tresca model. To show the flexibility of our model, several bearing geometries have been analysed, such as a twin parabolic slider, a cosine profile used to mimic a bearing, and a pocketed slider bearing employed to study the effect of surface texture. We observe that the lubrication performance (i.e. low friction coefficient) can be improved by using materials that promote slippage at the moving wall. The location of the slippage region can be optimised to find the lowest value of friction coefficient. Our theoretical developments and numerical implementation are shown to produce useful guidelines to improve and optimise the design of textured superoleophobic surfaces in the presence of lubricated contacts.

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Optimization of Pocket Geometry for Friction Reduction in Piston–Liner Contacts

Cited by 29 publications

References 38 publications

Experimental and numerical studies of positive texture effect on friction reduction of sliding contact under mixed lubrication

Experimental and numerical studies of positive texture effect on friction reduction of sliding contact under mixed lubrication

Looking into a laser textured piston ring-liner contact

Interplay between wall slip and cavitation: A complementary variable approach

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