Hydrodynamic lubrication of micro-textured surfaces: Two dimensional CFD-analysis

Caramia, Giovanni; Carbone, Giuseppe; Palma, P. De

doi:10.1016/j.triboint.2015.03.019

Cited by 35 publications

(25 citation statements)

References 22 publications

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“…The main reason is that textures fabricated by LST could be precisely controlled and this process is friendly to the environment [9,10]. Experimental results in this filed shows that significant improvement can be achieved by laser surface texturing [7,[10][11][12][13]. Recently, with the aim of minimizing the friction coefficient, Xiong et al [7] experimentally investigated the micro-dimple influence on tribological properties under starved oil lubrication.…”

Section: Introductionmentioning

confidence: 95%

“…A study by Fan et al [13] has investigated the effect of regular and controllable sizes micro-textured ZTA nanocomposite surfaces in dry contact and drip deionized water lubrication and found that the high dimple density can improve the tribological performance. Additionally, several numerical techniques have been developed to predict the performance of lubrication systems: from model based on the Reynolds equation to the solution of the more complex Navier-Stokes equations [11,14]. Caramia et al [11] developed the hydrodynamic lubrication between parallel micro-textured surfaces for isothermal incompressible steady two dimensional flow conditions and the maximum drag reduction achievable with a single-phase lubrication.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, several numerical techniques have been developed to predict the performance of lubrication systems: from model based on the Reynolds equation to the solution of the more complex Navier-Stokes equations [11,14]. Caramia et al [11] developed the hydrodynamic lubrication between parallel micro-textured surfaces for isothermal incompressible steady two dimensional flow conditions and the maximum drag reduction achievable with a single-phase lubrication. Furthermore, a numerical study by Sharma et al [14] used power law model to predict the influence of the micro dimple geometries on the static and dynamic performance characteristics of a textured hybrid thrust bearing.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Friction control by multi-shape textured surface under pin-on-disc test

Segu

Hwang

2015

Tribology International

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Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Friction control by multi-shape textured surface under pin-on-disc test

Segu

Hwang

2015

Tribology International

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“…Moreover, a wide variety of numerical approaches have been proposed to estimate the properties of lubrication systems as regards the Reynolds or Navier-Stokes equations. In another study, Caramia et al [6] approached the same phenomena both numerically and theoretically. They ran the same two-dimensional simulations in order to investigate the impact of the geometric parameters on the drag reduction and pressure forces.…”

Section: Introductionmentioning

confidence: 70%

Hidrodinamik yağlamada kullanılan mikro-doku yüzeyler üzerinde akışkanın, diskin açısal hızının ve boşluk sayısının direnç azalmasına etkilerinin sayısal incelenmesi

Olcay

Develi²

2017

SAÜ Fen Bilimleri Enstitüsü Dergisi

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There have been developments on surface texturing methods providing benefit in a great many engineering applications. Especially, influence on surface texturing in lubrication applications related to frictional properties have been cause of concern. In the present study, it was aimed to work on the computational fluid dynamics (CFD) study of the lubrication system consisting of two parallel plates. While one of the plates was sliding, the other one was stationary and an incompressible two-dimensional single phase flow was assumed between those plates. The scope of the CFD analysis was to determine the relationship between drag force and operating fluid properties (i.e., oil types), rotational speed and the amount of the cavities. It was realized that SAE 0W-30 was found to be the best fluid among the seven studied oil types providing optimal conditions such as high drag reduction and less drag force. It was noticed that the drag coefficient thus, drag force appeared to be increasing as the rotating disk speed rose. The influence of the number of the cavities along the textured surface was also investigated in the present study and it was found that drag reduction was not associated with the number of cavities because 0, 1, 2 and 3 cavities nearly gave the same drag force values.

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“…They stated that the groove introduced on the stationary surface of a parallel lubricated slider leads to an additional pressure build-up. Similarly, Caramia et al [11] studied parallel textured surfaces for a wide variety of geometries, varying their depth, width, and gap in terms of drag force. With a single-phase lubrication analysis, a maximum reduction in drag of about 20% was achieved.…”

Section: Introductionmentioning

confidence: 99%

Multiphase Computational Fluid Dynamics Analysis of Hydrodynamic Journal Bearing Under the Combined Influence of Texture and Slip

et al. 2019

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The drive to maintain the environmental sustainability and save the global energy consumption is urgent, making every powertrain system component a candidate to enhance efficiency. In this work, the combined effects of the slip boundary and textured surface in hydrodynamic journal bearing as one of the critical components in industrial powertrain and engine systems are assessed using a multiphase computational fluid dynamic analysis that allows for phase change in a cavitation process and arbitrary textured geometry. The texture studied consists of regularly spaced rectangular dimples through two-dimensional (infinitely long) journal bearing. The modified Navier–slip model is employed to describe the slip boundary condition. A systematic comparison is made for various textured configurations varying the texture depth and the length of the texturing zone with respect to the performance of a smooth (untextured) bearing for several eccentricity ratios. The effectiveness of the texture with or without slip at enhancing the load support over a corresponding smooth bearing is investigated with the parameters. The detrimental or beneficial effect of surface texturing as well as the slip promotion is explained in terms of the mechanisms of pressure generation for several eccentricity ratios. The results of the present work indicate that journal bearing textured by a proper texturing zone and dimple depth are characterized by substantial load support levels. However, in the range of high eccentricity ratios, the promotion of texturing and slip can significantly degrade the performance of the load support.

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Hydrodynamic lubrication of micro-textured surfaces: Two dimensional CFD-analysis

Cited by 35 publications

References 22 publications

Friction control by multi-shape textured surface under pin-on-disc test

Friction control by multi-shape textured surface under pin-on-disc test

Hidrodinamik yağlamada kullanılan mikro-doku yüzeyler üzerinde akışkanın, diskin açısal hızının ve boşluk sayısının direnç azalmasına etkilerinin sayısal incelenmesi

Multiphase Computational Fluid Dynamics Analysis of Hydrodynamic Journal Bearing Under the Combined Influence of Texture and Slip

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