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Journals
Lubricants
Special Issues
Advances in Mixed Lubrication
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Advances in Mixed Lubrication

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

Deadline for manuscript submissions: 30 November 2024 | Viewed by 2229

Special Issue Editors

Dr. Chunxing Gu

E-Mail Website
Guest Editor
School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
Interests: engine tribology; mixed lubrication; rough surface contact; surface texturing; numerical simulation
Special Issues, Collections and Topics in MDPI journals
Dr. Qin Dong

E-Mail Website
Guest Editor
School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
Interests: bearing lubrication; rough surface contact; surface texturing; numerical simulation

Special Issue Information

Dear Colleagues,

Mixed lubrication is the term applied to the transitional region between full hydrodynamic or elastohydrodynamic lubrication and boundary lubrication. In machine elements, rough surface contacts are often not dry and are lubricated by thin films. Machines are often subjected to extreme operating conditions such as high loading configurations, frequent start–stop conditions, starved lubrication, high temperatures, vibrations, and thin films. Both boundary lubrication and elastohydrodynamic lubrication are bridged together by mixed lubrication, which confirms local events such as solid-to-solid (asperity) contact. The movement of interacting surfaces generates friction forces, which are responsible for high heat generation, thereby causing increased energy loss and severe wear on the surface. Moreover, flow, pressure, stress distribution, friction, wear, and adhesion are significantly impacted by the roughness of interacting surfaces when under mixed lubrication. Understanding mixed lubrication is particularly important. The study of mixed lubrication processes such as fluid mechanisms, contact mechanisms, friction, and wear are such areas that require much improvement.

The aim of this Special Issue is to compile cutting-edge research from world-leading scientists working in the fields of tribology, covering a wide range of topics from theories to various applications, with respect to the areas that the keywords specify. Both theoretical and experimental investigations are highly welcome.

Dr. Chunxing Gu
Dr. Qin Dong
Guest Editors

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

  • mixed lubrication
  • friction
  • wear
  • fluid mechanics
  • contact mechanics
  • multiphysics modeling
  • surface texturing
  • surface roughness
  • low-friction design
  • tribological properties

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Further information on MDPI's Special Issue polices can be found here.

Published Papers (2 papers)

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Research

15 pages, 1662 KiB  
Communication
A Fully Implicit Coupled Scheme for Mixed Elastohydrodynamic Problems on Co-Allocated Grids
by Sören Wettmarshausen and Hubert Schwarze
Lubricants 2024, 12(9), 322; https://doi.org/10.3390/lubricants12090322 - 19 Sep 2024
Viewed by 482
Abstract
In the modeling of elastohydrodynamic lubrication problems considering mixed friction, strongly coupled dependencies occur due to piezo-viscous effects and asperities, which can make a numerical solution exceptionally difficult. A fully implicit coupled scheme for solving mixed elastohydrodynamic lubrication problems is presented. Our scheme [...] Read more.
In the modeling of elastohydrodynamic lubrication problems considering mixed friction, strongly coupled dependencies occur due to piezo-viscous effects and asperities, which can make a numerical solution exceptionally difficult. A fully implicit coupled scheme for solving mixed elastohydrodynamic lubrication problems is presented. Our scheme uses finite-volume discretization and co-allocated grids for hydrodynamic pressure and elastic deformation. To provide strong coupling between pressure and deformation even in the highly loaded zone, a correction term that adds numerical diffusion is used. The resulting linear equation system of this scheme can be efficiently solved by Krylov subspace methods. This results in an improved accuracy and computational efficiency compared to the existing methods. This approach was validated and has been shown to be accurate. Full article
(This article belongs to the Special Issue Advances in Mixed Lubrication)
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Graphical abstract

20 pages, 6521 KiB  
Article
Research on the Optimal Design Approach of the Surface Texture for Journal Bearings
by Chunxing Gu, Yumin Cui and Di Zhang
Lubricants 2024, 12(4), 111; https://doi.org/10.3390/lubricants12040111 - 28 Mar 2024
Viewed by 1214
Abstract
Aiming to improve the comprehensive performance of the journal bearing system, this paper presents a multi-objective adaptive scale texture optimization design approach. A mixed lubrication model for the textured journal bearing system is established by considering the effects of cavitation and roughness. The [...] Read more.
Aiming to improve the comprehensive performance of the journal bearing system, this paper presents a multi-objective adaptive scale texture optimization design approach. A mixed lubrication model for the textured journal bearing system is established by considering the effects of cavitation and roughness. The geometrical parameters of the textures were co-optimized using a multi-objective grey wolf optimizer to obtain the optimal texture schemes that are suitable for different operating conditions. Through this approach, the influences of different texture schemes under transient operating conditions can be investigated. According to the results, it was found that different texture schemes result in different friction reduction effects. Proper surface texture is beneficial in increasing the minimum oil film thickness and reducing the possibility of asperity contact. The adaptive scale texture exhibits strong adaptability and achieves significant hydrodynamic effects. Therefore, the developed approach provides valuable insights for the optimization design of journal bearing systems. Full article
(This article belongs to the Special Issue Advances in Mixed Lubrication)
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