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Lubricants
Special Issues
Hydrodynamic Lubrication of Textured Surfaces
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Hydrodynamic Lubrication of Textured Surfaces

A special issue of Lubricants (ISSN 2075-4442).

Deadline for manuscript submissions: closed (10 November 2023) | Viewed by 6739

Special Issue Editor

Dr. Qiang Li

E-Mail Website
Guest Editor
College of New Energy, China University of Petroleum (East China), Qingdao, China
Interests: load bearing and friction mechanism in lubrication; multi-objective optimization design in textured surfaces; numerical calculation of fluid–structure interaction in rotor-journal bearing system; turbulent lubrication in water-lubricated journal bearing; cavitation mechanism in hydrodynamic lubrication; fault diagnosis and mechanism in rotor-journal bearing system; vibration and lubrication film pressure measurement methods

Special Issue Information

Dear Colleagues,

In the last twenty years, in hydrodynamic lubrication fields, as the global demand for energy conservation and consumption reduction increases, textured surfaces have made great contributions to the improvement of bearing capacity with the reduction in friction noise and wear due to the micro-hydrodynamic and wear debris storage effect. With the development of further optimization of textured surfaces, the hydrodynamic lubrication performance of textured surfaces is gradually promoted. So far, textured surfaces have been applied in journal bearing, mechanical seals, piston ring-cylinder liner systems, cutting tools, texture bionic design and other hydrodynamic lubrication fields. However, the theory and design system based on the mechanism optimization application of textured surfaces still have not been established to integrate with the system design of equipment.

In view of the importance of textured surfaces to the field of hydrodynamic lubrication and surface engineering, combined with the research history of textured surfaces, this Special Issue aims to collect the contributions of scientists in the field of performance improvement mechanisms, optimization design and application of lubrication textured surfaces, in which the areas of turbulent hydrodynamic lubrication, fluid–structure interaction, cavitation and soft elastohydrodynamic lubrication are considered. Contributions are welcome from all scientists working in tribology, hydrodynamic lubrication, texture optimization design and related areas.

Dr. Qiang Li
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Lubricants is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • turbulent hydrodynamic lubrication
  • multi-objective optimization method
  • friction noise and wear
  • lubrication and cavitation mechanism
  • soft elastohydrodynamic lubrication
  • micro-hydrodynamic effect
  • hydrodynamic lubrication performance promotion
  • fluid–structure interaction
  • rotor-journal bearing system
  • mechanical seal
  • piston ring and cylinder liner system
  • cutting tool
  • textured surface bionic design
  • lubrication measurement methods
  • characteristic coefficient of liquid film

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Published Papers (5 papers)

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Research

20 pages, 5109 KiB  
Article
Partial Surface Texturing in Hydrodynamic Lubrication: A CFD-Based Investigation
by Igal Cohen and Roman Goltsberg
Lubricants 2023, 11(9), 395; https://doi.org/10.3390/lubricants11090395 - 12 Sep 2023
Cited by 3 | Viewed by 1169
Abstract
The present study investigates the effect of partial surface texturing, containing large number of micro-dimples, in lubrication mechanisms. A CFD model is applied to examine the influence of partial surface texturing on pressure and velocity distribution in the flow between mating surfaces with [...] Read more.
The present study investigates the effect of partial surface texturing, containing large number of micro-dimples, in lubrication mechanisms. A CFD model is applied to examine the influence of partial surface texturing on pressure and velocity distribution in the flow between mating surfaces with relative motion or pressure drop. Various texturing parameters were analyzed. The results indicate that the equivalent volume step model effectively simulates surface texturing for a wide range of parameters when the untextured surface is in motion or for pressure-drop-induced flows, as surface texturing is less effective than the equivalent volume step by a margin of under 20%. However, when the motion involves the textured surface, surface texturing is found to be significantly less effective than the equivalent volume step and may even lead to detrimental effects, as the gage pressure can be negative. Furthermore, the influence of different parameters of the dimples, such as dimple area density, texturing portion, aspect ratio and dimple depth, on the efficiency reduction of surface texturing compared with the step model is discussed. Full article
(This article belongs to the Special Issue Hydrodynamic Lubrication of Textured Surfaces)
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16 pages, 54050 KiB  
Article
Analysis of the Turbulent Lubrication of a Textured Hydrodynamic Journal Bearing
by Yazhou Mao, Lilin Li, Daqing Li and Jingyang Zheng
Lubricants 2023, 11(9), 362; https://doi.org/10.3390/lubricants11090362 - 25 Aug 2023
Cited by 3 | Viewed by 1282
Abstract
In order to investigate the turbulent lubrication performance of a textured hydrodynamic journal bearing (THJB), a model of turbulent lubrication was established in this paper. The variations in the Reynolds number, oil film thickness, oil film pressure, bearing capacity, attitude angle, and side [...] Read more.
In order to investigate the turbulent lubrication performance of a textured hydrodynamic journal bearing (THJB), a model of turbulent lubrication was established in this paper. The variations in the Reynolds number, oil film thickness, oil film pressure, bearing capacity, attitude angle, and side leakage flow with structural and working parameters were studied, and the axis whirl orbit was further analyzed. The results show that turbulent lubrication is suitable for the actual operating conditions of THJBs. The Reynolds number decreases with the eccentricity ratio in the pressure-bearing zone but increases with rotational speeds, whereas the variation in the maximum oil film pressure increases and the minimum oil film thickness decreases with the eccentricity ratio under various Reynolds numbers. The bearing capacity decreases with the dimple diameter, depth, oil film thickness, and clearance ratio but increases with the length/diameter ratio and dimple spacing. As the eccentricity ratio increases, the attitude angle decreases, but the side leakage flow increases. In addition, the system tends to be unstable as the rotational speed and length/diameter ratio increase, and the friction and wear on the surface are three-body friction. This work not only helps in analyzing the characteristics of a THJB under actual operating conditions but also provides support for research on the simulation of THJB’s lubrication mechanism of THJB via computational fluid dynamics. Full article
(This article belongs to the Special Issue Hydrodynamic Lubrication of Textured Surfaces)
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32 pages, 60160 KiB  
Article
Research on Internal Flow Field Characteristics of Straight-Groove Texture Using Three-Dimensional Modeling
by Yulong Li, Zhehao Zhang, Yongyong He and Jianbin Luo
Lubricants 2023, 11(8), 338; https://doi.org/10.3390/lubricants11080338 - 9 Aug 2023
Cited by 2 | Viewed by 1361
Abstract
Surface texture modification is a reasonable strategy for improving the tribological property of friction pairs. The internal flow behavior of the surface texture significantly impacts its performance. In this study, a three-dimensional computational fluid dynamics (CFD) model is constructed to explore the internal [...] Read more.
Surface texture modification is a reasonable strategy for improving the tribological property of friction pairs. The internal flow behavior of the surface texture significantly impacts its performance. In this study, a three-dimensional computational fluid dynamics (CFD) model is constructed to explore the internal flow behavior of the straight-groove texture in the thrust bearing. The influences of the Reynolds number, depth ratio, and area ratio of the straight-groove texture on the internal flow behavior are systematically investigated. Furthermore, the streamline and tribological performance parameters are checked to reveal the mechanism of the groove texture influencing the tribological properties. It is found that the vortex and cavitation significantly affect the tribological performance of textured surfaces under hydrodynamic lubrication. The cavitation and upstream vortex areas increase with the Reynolds number, while the downstream vortex area shows a reverse trend. The increase in depth ratio strengthens the upstream and downstream vortexes while reducing the cavitation area. Additionally, a method is proposed to determine the location of the cavitation within the groove texture. Certain operating conditions create the optimal texture depth ratio and area ratio, which could maximize the load-carrying capacity (LCC) of the oil film, and the friction coefficient is relatively small. Full article
(This article belongs to the Special Issue Hydrodynamic Lubrication of Textured Surfaces)
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19 pages, 6814 KiB  
Article
Combined Effect of Fluid Cavitation and Inertia on the Pressure Buildup of Parallel Textured Surfaces
by Xuezhong Ma
Lubricants 2023, 11(7), 270; https://doi.org/10.3390/lubricants11070270 - 21 Jun 2023
Cited by 3 | Viewed by 1188
Abstract
A mathematical model is developed to investigate the combined effect of fluid cavitation and inertia on the fluid pressure buildup of parallel textured surfaces. The fluid cavitation is analyzed using the Rayleigh–Plesset model, and the fluid inertia is analyzed with an averaged method. [...] Read more.
A mathematical model is developed to investigate the combined effect of fluid cavitation and inertia on the fluid pressure buildup of parallel textured surfaces. The fluid cavitation is analyzed using the Rayleigh–Plesset model, and the fluid inertia is analyzed with an averaged method. The finite element method and Newton-downhill method are employed to solve the governing equations. The numerical model is validated by comparing the experimental and numerical results, and the combined effect of fluid cavitation and inertia on the fluid pressure buildup is analyzed and discussed. The research indicates that the cavitation weakens the fluid inertia effect on the pressure distribution at the inlet area of textures. The fluid inertia greatly enhances the hydrodynamic effect and effectively limits the excessive extension of the low-pressure zone caused by cavitation. The fluid cavitation and inertia, especially their interaction, significantly affect the fluid pressure buildup and generate a net load-carrying capacity (LCC). The numerical model with the fluid inertia and cavitation is more time saving than the commercial CFD tools in solutions, which gives a novel and optional HD foundation for developing a more efficient and accurate THD or TEHD model by numerical programming. Full article
(This article belongs to the Special Issue Hydrodynamic Lubrication of Textured Surfaces)
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13 pages, 2716 KiB  
Article
Investigation of the Static Performance of Hydrostatic Thrust Bearings Considering Non-Gaussian Surface Topography
by Huaiqing Lu and Zhuxin Tian
Lubricants 2023, 11(6), 267; https://doi.org/10.3390/lubricants11060267 - 20 Jun 2023
Cited by 1 | Viewed by 1201
Abstract
The dynamic and static characteristics of hydrostatic thrust bearings are significantly affected by the bearing surface topography. Previous studies on hydrostatic thrust bearings have focused on Gaussian distribution models of bearing surface topography. However, based on actual measurements, the non-Gaussianity of the distribution [...] Read more.
The dynamic and static characteristics of hydrostatic thrust bearings are significantly affected by the bearing surface topography. Previous studies on hydrostatic thrust bearings have focused on Gaussian distribution models of bearing surface topography. However, based on actual measurements, the non-Gaussianity of the distribution characteristics of bearing surface topography is clear. To accurately characterize the non-Gaussian distribution of bearing surface topography, the traditional probability density function of Gaussian distribution was modified by introducing Edgeworth expansion. The non-Gaussian surface was then reflected by two parameters: kurtosis and skewness. This had an effect on the static characteristics of hydrostatic thrust bearings with both circumferential and radial surface topographies. The comparison between the Gaussian distribution results and those of the non-Gaussian model showed that errors between the two models could reach more than 10%. Therefore, it is important to take into account the non-Gaussianity of bearing surface when discussing static characteristics of hydrostatic thrust bearings considering the surface topography. Full article
(This article belongs to the Special Issue Hydrodynamic Lubrication of Textured Surfaces)
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