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Lubricants
Special Issues
New Advances in Lubrication Film Detection
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New Advances in Lubrication Film Detection

A Special Issue of Lubricants (ISSN 2075-4442).

Deadline for manuscript submissions: 30 April 2027 | Viewed by 328

Editors

Dr. Hongkai Li

E-Mail Website
Guest Editor
School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
Interests: micro/nano detection technology; electromagnetic sensor and measurement system
Dr. He Liang

E-Mail Website
Guest Editor
School of Machinery and Vehicles, Beijing Institute of Technology, Beijing 100081, China
Interests: surface and interface science of high-end equipment; tribology and lubrication mechanisms; micro/nano-scale measurement methods; characterization
Special Issues, Collections and Topics in MDPI journals
Dr. Pengzhe Zhu

E-Mail Website
Guest Editor
College of Mechanical and Vehicle Engineering, Beijing Institute of Technology, Beijing 100081, China
Interests: tribology; multi-scale simulations
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Lubrication film detection is essential for understanding interfacial lubrication mechanisms and ensuring the reliability of mechanical components operating under increasingly complex conditions. Recent advances in optical measurement, fluorescence imaging, electromagnetic sensing, acoustic emission, Raman spectroscopy, and data-driven analysis have enabled more accurate, real-time, and multi-scale characterization of lubricant films in concentrated contacts, bearings, gears, seals, and other tribological systems. These techniques provide new insights into film thickness evolution, lubricant distribution, phase separation, and lubrication failure processes.

This Special Issue focuses on new advances in lubrication film/ fluid state detection, with particular interest in experimental methods, sensor technologies, in situ visualization, signal processing, numerical–experimental coupling, and intelligent diagnosis of lubrication states. Contributions addressing challenging issues such as high speeds, high loads, limited lubricant supply, grease lubrication, and liquid–gas phase transition are especially welcome. Both fundamental studies and engineering applications that improve the measurement, interpretation, and control of lubrication film and fluid state are encouraged.

Dr. Hongkai Li
Dr. He Liang
Dr. Pengzhe Zhu
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 250 words) can be sent to the Editorial Office for assessment.

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-anonymized 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

  • lubrication film detecting
  • micro/nano-scale thickness measurement
  • fluid state detection
  • in situ visualization
  • optical interferometry
  • fluorescence imaging
  • raman spectroscopy
  • eddy-current sensor
  • intelligent lubrication diagnosis
  • signal processing

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Published Papers (1 paper)

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Research

24 pages, 13385 KB  
Article
Film Thickness Evolution Behavior and Mechanism of Lubricating Grease at High Speeds
by Lingtong Sun, Wenzhong Wang, Zhi Chen, Jianlong Liu and He Liang
Lubricants 2026, 14(9), 338; https://doi.org/10.3390/lubricants14090338 - 1 Sep 2026
Viewed by 235
Abstract
In most cases, lubricating grease serves as the primary lubricating medium for rolling bearings, ensuring normal operation by facilitating lubrication between bearing components. Current experimental research on grease lubrication predominantly focuses on low-speed conditions (below 2 m/s), which no longer aligns with the [...] Read more.
In most cases, lubricating grease serves as the primary lubricating medium for rolling bearings, ensuring normal operation by facilitating lubrication between bearing components. Current experimental research on grease lubrication predominantly focuses on low-speed conditions (below 2 m/s), which no longer aligns with the increasingly high operational speeds of rolling bearings. To address this gap, we conduct the high-speed lubrication experiments with a maximum speed up to 10.68 m/s using a ball-on-ring test rig under a certain amount of grease supply. The results reveal a clear distinction in film thickness evolution between high-speed and low-speed stages: at low speed, the film thickness gradually decreases with the number of ring revolutions until it stabilizes after the grease reservoir reformation; however, at high speed, a significant recovery in film thickness occurs following reservoir reformation. Observations of grease distribution further indicate that, under shear forces, the thickener on both sides of the track undergoes shear-induced breakdown and becomes uniformly distributed. This intensified shear promotes the formation of larger grease reservoirs along the contact sides and leads to the recovery of film thickness under high-speed conditions. The amount of effectively sheared grease that ultimately participates in lubrication can be characterized by the width of the grease ridge. Full article
(This article belongs to the Special Issue New Advances in Lubrication Film Detection)
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