.... The different geometric shapes of textured surfaces, including spherical, rectangular, and conical, have been selected for numerical analysis. Next-generation design for tribological systems based on MR fluid lubrication emphasizes dynamic performance. MR fluid responds quickly, and its rheological...

... ,” Lubricants , 11 ( 2 ), p. 44 . 10.3390/lubricants11020044 [11] Xu , H. , Wang , P. , and Ma , H. , 2022 , “ Contact Characteristics Analysis of Deep Groove Ball Bearings Under Combined Angular Misalignments and External Loads ,” ASME J. Tribol. , 144 ( 12 ), p. 121201 . 10.1115...

... the dynamic film-forming behavior of lubricating grease under steady-state and micro-oscillation conditions. It is found that free water causes a brief rise in the grease film under steady-state conditions, specifically due to the grease-water phase connecting the oil reservoirs on both sides. The experiment...

... are useful in liquid seals, shock absorbers, controlling heat in loudspeakers, printing for paper money, and lubrication bearings [ 5 ]. The commercial use of ferrofluids has been available in the literature [ 32 , 33 ]. Ferrofluids can be used in heat transfer, sealing, damping, and lubrication [ 38...

... to the adhesion and abrasion mechanism generated between the contact surfaces. In this work, the ball-on-flat experiments were performed on stainless steel-420 versus 100cr6 friction pairs under dry, minimum quantity lubrication (MQL) and pool conditions. Then, the wear studies in terms of volume loss, profile...

...Zhiqiang Liu; Jiandong Yin; Fucheng Zhao Downsizing in spark-ignited engines becomes one of the most effective concepts to achieve fuel economy and emissions requirements and drives operating conditions of major moving engine components into more mixed and boundary lubrication regimes. Piston ring...

...Robert J. Sadinski; Carl H. Hager, Jr.; William M. Hannon The relative volume and falling body viscosity of a common high-pressure rheology reference lubricant, di-(2-ethylhexyl) sebacate (DEHS), are presented. Relative volume measurements up to 300 MPa are completed with a piezo-bellows relative...

... balls lubricated with castor grease having an optimum concentration of 2D nanomaterials, i.e., MoS 2 (0.02 wt%), MoS 2 -ODT (0.02 wt%), GO (0.05 wt%), GO-ODA (0.03 wt%), and rGO (0.01 wt%). The castor grease exhibited a higher COF throughout the running-in period. The smooth and stable friction profile...

...Justino A. O. Cruz; Pedro M. T. Marques; Jorge H. O. Seabra; Jorge D. Castro This work studies the power loss in a real axle box gear transmission under no-load operating conditions. The influence of the rotational speed and of the lubricant viscosity was considered. An experimental strategy...

...Boris Grigor’ev; Artem Eliseev The upper convected Maxwell (UCM) model is one of the ways to describe lubricant’s viscoelasticity. In this paper, a new modified Reynolds equation for the UCM model is derived. This equation may be called extended as compared to its analogs because it incorporates...

...Fan Zhang; Nicolas Fillot; Rudolf Hauleitner; Guillermo E. Morales-Espejel A first cavitation modeling with thermal effects for oil/refrigerant solutions lubricated elastohydrodynamic point contacts is reported in this work. The solubility of the oil/refrigerant system is introduced...

...Yan Chen; Xuezhen Wang; Zehua Han; Alexander Sinyukov; Abraham Clearfield; Hong Liang The advancement of electric vehicles demands lubricants with multifunction and performance. In this research, we investigated amphiphilic ZrP nanoparticles as lubricant additives. Experiments showed...

...Shuai Li; Qiang Ma; Zhe Tong; Qi Liu; Guangneng Dong The major objective of this work is to investigate the synergistic lubricating performance of hexagonal boron nitride (h-BN) and graphite fluoride (GF) nanoparticles (NPs) in white oil. The tribological tests were carried out on steel-steel...

... lubrication using current-carrying wire model for the fixed coordinate system, (2) deriving the expressions for the magnetic field model and frictional power loss other than Reynolds equation for ferrofluid lubrication, and (3) evaluation of optimal values of spiral-grooved bearing surface for different cross...

...J. B. Boni; C. Changenet; F. Ville Planetary gears are used in several applications given that they provide high reduction ratio in a compact size. Two kinds of lubrication are used in these applications: injection or splash lubrication. In case of splash lubrication, the authors already...

... PAO base oils to obtain the optimized lubrication behavior. The test results revealed that PAO 4 exhibited a reduction in friction coefficient (∼27%) and wear volume (∼88%) at a dose of 0.05 wt% and 0.025 wt% MWCNTs, respectively. However, in PAO 6, the minimum coefficient of friction and wear volume...

... during tribological interactions is explored. Hence, unidirectional sliding wear experiments were carried out in immersed lubrication conditions for various normal loads. The tribological interactions were studied using EN31-60 HRC flats and SAE52100-60 HRC pins in a sphere on flat configuration...

... micronscale iron. The hBN lubricant particles significantly improve the friction performance of iron in various simulation behaviors. The particle size, the air/water background containing the particles, and its temperature result in reduction of the friction coefficient. The surface mending, the protective...

...) are the most significant two, followed by Si (silicon content), viscosity, and so on. This is because gears are generally made of steel, once abrasion occurs, naturally there will be more ferromagnetic particles and iron particles in the lubricant. As for Si, we know that impurities in lubricant cause wear...

... boundary lubrication elastohydrodynamic lubrication films fluid film lubrication gears lubricants mixed lubrication tribological systems wear cooling heat transfer Modern jet engines for civil applications are characterized by high bypass ratios (BPR), high pressure ratios, and high...