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Lubricants
Special Issues
Thermal Hydrodynamic Lubrication
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Thermal Hydrodynamic Lubrication

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

Deadline for manuscript submissions: 20 June 2025 | Viewed by 1394

Special Issue Editors

Prof. Dr. Xiaori Liu

E-Mail Website
Guest Editor
School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300130, China
Interests: mixed lubrication; multi-scale heat transfer; multiphase flow; low friction; engine lubrication
Dr. Ke Sun

E-Mail Website
Guest Editor
School of Energy and Power Engineering, Shandong University, Jinan 250061, China
Interests: internal combustion engine; lubrication; combustion; heat transfer
Dr. Shuo Liu

E-Mail Website
Guest Editor
School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Interests: mixed lubrication; multi-physics coupling; tribo-dynamic modelling; surface and interface; industrial tribology

Special Issue Information

Dear Colleagues,

Thermal hydrodynamic lubrication research is essential in the situations where heat transfer in the environment has a significant impact on the lubrication characteristics or the frictional heat generated has a significant impact on lubrication, friction, and wear.

Thermal hydrodynamic lubrication is a comprehensive and complex issue that involves the flow and heat transfer characteristics in the channel, thermal properties of lubricants, surface properties, and interface coupling. It has important reference value for low friction and wear design.

In different industrial application cases such as transportation, precision instruments, heavy machinery, robotics, and medicine, thermal hydrodynamic lubrication has its own characteristics, and it is worthy of further research and application.

Advancements in computational methods and material science are continuously enhancing the understanding and effectiveness of thermal hydrodynamic lubrication, paving the way for innovative solutions in various engineering and industrial applications.

Prof. Dr. Xiaori Liu
Dr. Ke Sun
Dr. Shuo Liu
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

  • lubrication
  • heat transfer
  • fluid mechanics
  • friction
  • wear
  • surface and interaction
  • industrial tribology
  • thin-film simulation

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Published Papers (2 papers)

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Research

14 pages, 8524 KiB  
Article
Levitation Performance of Radial Film Riding Seals for Gas Turbine Engines
by Syed Muntazir Mehdi, Young Cheol Kim and Eojin Kim
Lubricants 2024, 12(12), 433; https://doi.org/10.3390/lubricants12120433 - 5 Dec 2024
Viewed by 460
Abstract
Turbomachinery in gas turbines uses seals to control the leakage between regions of high and low pressure, consequently enhancing engine efficiency and performance. A film riding seal hybridizes the advantages of contact and non-contact seals, i.e., low leakage and low friction and wear. [...] Read more.
Turbomachinery in gas turbines uses seals to control the leakage between regions of high and low pressure, consequently enhancing engine efficiency and performance. A film riding seal hybridizes the advantages of contact and non-contact seals, i.e., low leakage and low friction and wear. The literature focuses on the leakage performance of these seals; however, one of their fundamental characteristics, i.e., the gap between the rotor and seal surface, is scarcely presented. The seal pad levitates due to the deflection of the springs at its back under the influence of hydrodynamic forces. This study develops a test rig to measure the levitation of film riding seals. A high-speed motor rotates the rotor and gap sensors measure the levitation of the seal pads. Measurements are also compared with the predictions from a Reynolds equation-based theoretical model. Tests performed for the increasing rotor speed indicated that, initially, until a certain rotor speed, the pads adjust their position, then rub against the rotor until another rotor speed is reached, before finally starting levitating with further increased rotor speeds. Moreover, both the measured and predicted results show that pads levitated the most when located 90° clockwise from the positive horizontal axis (bottom of seal housing) compared to other circumferential positions. Full article
(This article belongs to the Special Issue Thermal Hydrodynamic Lubrication)
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19 pages, 7422 KiB  
Article
Leakage Characteristics and Experimental Research of Staggered Labyrinth Sealing
by Na Wang, Yongbing Cao, Zhencong Sun, Shixin Tang and Seung-Bok Choi
Lubricants 2024, 12(11), 369; https://doi.org/10.3390/lubricants12110369 - 24 Oct 2024
Viewed by 655
Abstract
The staggered labyrinth seal is widely used in aerospace, transportation, mining, and other fields due to its advantages of adapting to high speed, reliable sealing performance, and low or even frictionless friction between dynamic and static rotors. The traditional calculation method of labyrinth [...] Read more.
The staggered labyrinth seal is widely used in aerospace, transportation, mining, and other fields due to its advantages of adapting to high speed, reliable sealing performance, and low or even frictionless friction between dynamic and static rotors. The traditional calculation method of labyrinth seal leakage mostly focuses on the fact that the internal medium is an ideal gas and only considers a single effect, which cannot accurately describe the leakage of liquid medium lubricating oil in the labyrinth seal. Therefore, this study focuses on the leakage characteristics of labyrinth seals, and it proposes a leakage calculation method based on liquid medium in view of the shortcomings of existing calculation methods under liquid medium conditions. By considering the thermodynamic and frictional effects of the staggered labyrinth sealing, the resistance loss and thermodynamic effect of the lubricating oil in the sealing cavity were analyzed. The flow field analysis was used to reveal the leakage law of lubricating oil under different conditions, and the factors such as total inlet pressure, spindle speed, and sealing clearance were considered. Finally, the leakage characteristics of the staggered labyrinth seal and the accuracy of the calculation method of the leakage of the staggered labyrinth seal under multiple effects were revealed through experimental verification. This study provides useful guidance for the performance optimization of labyrinth seals in practical applications. Full article
(This article belongs to the Special Issue Thermal Hydrodynamic Lubrication)
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