An Average Flow Model of Rough Surface Lubrication With Inter-Asperity Cavitation

Harp, Susan R.; Salant, Richard F.

doi:10.1115/1.1332397

Cited by 109 publications

(75 citation statements)

References 13 publications

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“…Refs. [30][31][32][33][34]. In these models the local elastic deformation (at the asperities scale), resulting from the asperity-asperity and asperity-fluid interactions, was not included.…”

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confidence: 99%

Lubrication in soft rough contacts: A novel homogenized approach. Part I - Theory

et al. 2011

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We study the lubricated steady sliding contact between rough surfaces of (elastically) soft solids. A novel mean field theory of mixed lubrication is presented, which takes into account the coupled effect of asperity-asperity and asperity-fluid interactions. We calculate the fluid flow factors, and discuss the nature of the transition from the boundary lubrication regime, where the normal load is supported by the asperity-asperity interactions (sometimes mediated by boundary films), to the hydrodynamic regime, where a thin fluid film prevents direct contact between the mating surfaces.

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confidence: 99%

Lubrication in soft rough contacts: A novel homogenized approach. Part I - Theory

et al. 2011

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“…For the used Peklenik factors of 9 and 1/9 the lengths were chosen to be 1 node and 9 nodes. Even when other authors use longer correlation lengths [43,44], these values were chosen, based on the work of Patir and Cheng to achieve a proof of principle. As Tripp explains [42], the flow factors are not expected to be sensitive to the precise choice of correlation function, provided they refer to physically similar surface textures.…”

Section: Geometry and Meshmentioning

confidence: 99%

A Novel Approach for Modeling Surface Effects in Hydrodynamic Lubrication

et al. 2018

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Abstract:The common approach for the flow factor calculation is based on using the Reynolds equation to simulate the micro-level flow. However, for structured surfaces the fluid flow cannot be represented correctly, due to the assumptions made when deriving the Reynolds equation. In this work, a novel method using the Navier-Stokes equations for the calculation of the micro-level flow is presented and validated against results from Patir and Cheng. The three-dimensional lubrication gap was generated by a rough Gaussian random surface and a perfectly smooth moving counter surface, in order to be available for different numerical methods. The presented results illustrate similar trends for both the approaches. Additionally, the use of the Navier-Stokes equations allows for the observance of surface induced effects which cannot be resolved by the approach of Patir and Cheng. Furthermore, a numerical approach for a shear flow factor calculation with a rough moving surface is presented and validated against other simulation methods. While the validation is maintained with pressure-and temperature-independent density and viscosity, these effects will be taken into account for later research activities of textured surfaces.

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“…Payvar and Salant (1992) analyzed the effect of sealing structure on the cavitation with mass-conservative theory, but again neglected the surface roughness. Based on the Payvar and Salant (1992)'s theory, Harp (2000;2001; carried out the basic theoretical research on cavitation with roughness which was compared with a deterministic model and the model of Patir and Cheng (1978).…”

Section: Introductionmentioning

confidence: 99%

Inter-asperity cavitation for misalignment journal lubrication problem based on mass-conservative algorithm

Zhang

et al. 2013

J. Zhejiang Univ. Sci. A

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Journal misalignment is common in journal bearings. When severe journal misalignment takes place, it affects nearly all aspects of bearing performance. This paper provided a comprehensive analysis of misaligned journal bearings based on two different mass-conservative models which appropriately took into account film rupture and reformation. The lubrication characteristics and performance parameters including the cavitation zones, pressure distribution, density distribution, oil leakage, load capacity, moment, and attitude angle were compared with the traditional lubrication model. The results showed that cavitation has great effect on bearing performances, especially when the surface roughness is large. Therefore, it is necessary to consider the effects of journal misalignment alongside inter-asperity cavitation theory in the design and analyses of journal bearings.

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An Average Flow Model of Rough Surface Lubrication With Inter-Asperity Cavitation

Cited by 109 publications

References 13 publications

Lubrication in soft rough contacts: A novel homogenized approach. Part I - Theory

Lubrication in soft rough contacts: A novel homogenized approach. Part I - Theory

A Novel Approach for Modeling Surface Effects in Hydrodynamic Lubrication

Inter-asperity cavitation for misalignment journal lubrication problem based on mass-conservative algorithm

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