CFD simulation of grease lubrication: Analysis of the power losses and lubricant flows inside a back-to-back test rig gearbox

Mastrone, Marco Nicola; Concli, Franco

doi:10.1016/j.jnnfm.2021.104652

Cited by 19 publications

(13 citation statements)

References 25 publications

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“…Note that this approach differs from those reviewed by Mastrone et al [66], who compared several meshing approaches for the CFD simulation of gear transmissions. The overset, local and global remeshing approaches demand a huge computational cost in this case, especially in terms of time.…”

Section: Cfd Simulation Detailsmentioning

confidence: 98%

Convective heat transfer modelling in dry-running polymer spur gears

Roda-Casanova

Sanchez-Marin²,

Martínez‐Cuenca³

2023

International Journal of Mechanical Sciences

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Section: Cfd Simulation Detailsmentioning

confidence: 98%

Convective heat transfer modelling in dry-running polymer spur gears

Roda-Casanova

Sanchez-Marin²,

Martínez‐Cuenca³

2023

International Journal of Mechanical Sciences

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“…For multiphase problems with immiscible fluids, the Volume of Fluid (VoF) method is applied. Thereby, the fluid variables in each finite volume either originate from a single phase, or from a mixture of phases, depending on the volume fraction α in each finite volume [19,31]. For the density ρ, it reads:…”

Section: Governing Equationsmentioning

confidence: 99%

“…Nogi et al [18] investigated the grease film thickness in EHL point contacts numerically at low speeds. Recently, Mastrone and Concli [19] applied a CFD model to investigate the fluid flow and no-load gear power loss of a NLGI 1 grease in a test gearbox of the FZG back-to-back test rig. Thereby, grease fill volumes of 40%, 50% and 80% were investigated at medium circumferential speed.…”

Section: Introductionmentioning

confidence: 99%

Numerical Visualization of Grease Flow in a Gearbox

Liu

Dangl

Lohner

et al. 2023

Chin. J. Mech. Eng.

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Lubricating greases are widely used in e.g. open gear drives and gearboxes with difficult sealing conditions. The efficiency and heat balance of grease-lubricated gearboxes depend strongly on the lubrication mechanisms channeling and circulating, for which the grease flow is causal. The computational fluid dynamics opens up the possibility to visualize and understand the grease flow in gearboxes in more detail. In this study, a single-stage gearbox lubricated with an NLGI 1-2 grease was modeled by the finite-volume method to numerically investigate the fluid flow. Results show that the rotating gears influence the grease sump only locally around the gears. For a low grease fill volume, the rotation of the gears is widely separated from the grease sump. For a high grease fill volume, a pronounced gear-grease interaction results in a circulating grease flow around the gears. The simulated grease distributions show good accordance with high-speed camera recordings.

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“…The existence of friction and wear reduces the transmission efficiency and life of machinery, thereby causing great economic losses. , The research on lubrication technology to achieve the goal of reducing friction and decreasing wear can bring about significant economic benefits. , Since Shinjo and Hirano proposed the phenomenon of superlubricity in the early 1990s, it has attracted a large number of researchers to conduct extensive research in this field. − Superlubricity refers to a lubrication state with a coefficient of friction (COF) less than 0.01 . It is a promising technology for achieving energy saving and emission reduction and improving material durability .…”

Section: Introductionmentioning

confidence: 99%

Effect of the Molecular Structure of 1,3-Diketones on the Realization of Oil-Based Superlubricity on Steel/Steel Friction Pairs

Du,

Zhang,

Luo

2023

Langmuir

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In this article, five kinds of 1,3-diketones and their chelates with different molecular structures were prepared, and their tribological properties were tested. The experimental results show that the running-in time and friction coefficient of the friction pairs lubricated by 1,3-diketones containing a benzene ring increased with the increase of the carbon chain length. In addition, only the friction pair lubricated by 1-(4-ethylphenyl)-butane-1,3-dione (0201) and 1-(4ethylphenyl)-nonane-1,3-dione (0206) could achieve stable superlubricity. When the benzene ring was replaced with a carbon six-membered ring, it was found that although the friction pair lubricated by this lubricant could achieve superlubricity, the wear of the friction pair was severe, and obvious abrasive wear occurred. In addition, the lubricants prepared by mixing 1,3-diketones and the corresponding chelates in a ratio of 4:6 had greatly improved lubricating properties compared to 1,3-diketones. Through X-ray photoelectron spectroscopy (XPS) analysis of the surface of the friction pair after the test and Fourier transform infrared (FT-IR) and nuclear magnetic resonance (NMR) analyses of 1,3-diketones before and after the experiment, we found that the necessary conditions for the friction pair lubricated by 1,3-diketone to achieve superlubricity were formation of tribochemical adsorption films and the presence of chelates in solution.

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CFD simulation of grease lubrication: Analysis of the power losses and lubricant flows inside a back-to-back test rig gearbox

Cited by 19 publications

References 25 publications

Convective heat transfer modelling in dry-running polymer spur gears

Convective heat transfer modelling in dry-running polymer spur gears

Numerical Visualization of Grease Flow in a Gearbox

Effect of the Molecular Structure of 1,3-Diketones on the Realization of Oil-Based Superlubricity on Steel/Steel Friction Pairs

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