Particle behavior in two-phased lubrication

Kumar, Abhay; Schmid, Steven R.; Wilson, W. R. D.

doi:10.1016/s0043-1648(96)07340-1

Cited by 23 publications

(6 citation statements)

References 5 publications

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“…In the present study, the particle size is larger than the size of nano‐particle, moreover, the particle never contacts with either of the lubricated surfaces. On the other hand, the behavior of particles in fluid film has been studied by many researchers (Kumar et al , 1997; Kusano and Hutchings, 2003; Nikas, 2002). Their studies focused on the motion of particles in the lubricant, while the lubrication characteristics of fluid film have not been paid much attention to.…”

Section: Introductionmentioning

confidence: 99%

Effect of particle transient motion on lubrication

Han¹,

Zhang²,

Zhong³

2010

Industrial Lubrication and Tribology

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PurposeThe purpose of this paper is to analyze the influence of particle motion on the lubrication characteristics. The dynamics of the particle in the lubricant is also studied.Design/methodology/approachThe dynamics of the particle is studied using Newton's second law. The particle dynamic equation is solved to determine the particle velocity, angular velocity, and location. The modified Reynolds equation is solved in couple with particle motion to determine the film pressure and velocity.FindingsThe motion of a particle suspended in the lube oil is clarified. The initial relative velocity between the particle and the fluid has a significant effect on the lubrication. For the same particle location and velocity, the larger particle or the closer distance between particle center and lower plate has greater effects on the film pressure.Research limitations/implicationsThe influence of the particle geometry on the lubrication is neglected in the study because of the small size of the particle, this neglect is idealized. Further study will take the effects of the particle geometry into consideration.Originality/valueThe paper provides the motion of the particle in the lubricant, and the modified Reynolds equation considering the particle translation as well as rotation is derived.

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Section: Introductionmentioning

confidence: 99%

Effect of particle transient motion on lubrication

Han¹,

Zhang²,

Zhong³

2010

Industrial Lubrication and Tribology

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“…While a number of mechanisms of friction reduction and wear reduction are proposed in these same studies, care must be taken in applying these to the particle system tested in this study. Mechanisms proposed in literature are focused on metallic-based nanoparticles with the majority being used in the elastohydrodynamic regime [33,45]. Particles in these studies were generally measured at particle concentrations [45,46] lower than 0.1 wt% to overcome the problem of particle aggregation.…”

Section: Proposed Mechanism Of Friction Reductionmentioning

confidence: 99%

“…Mechanisms proposed in literature are focused on metallic-based nanoparticles with the majority being used in the elastohydrodynamic regime [33,45]. Particles in these studies were generally measured at particle concentrations [45,46] lower than 0.1 wt% to overcome the problem of particle aggregation. This problem is overcome here by the use of steric stabilisers incorporated onto the particles surface.…”

Section: Proposed Mechanism Of Friction Reductionmentioning

confidence: 99%

Synthesis and tribological testing of poly(methyl methacrylate) particles containing encapsulated organic friction modifier

Mitchell

Neville

Walker³

et al. 2018

Tribology International

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The tribological behaviour of polymer particles containing an encapsulated, organic friction modifier (FM) is presented. Particles comprising of a poly (methyl methacrylate) (PMMA) shall and a methanol core, into which FM was dissolved, were produced via a dispersion polymerization producing a core-shell morphology. The inclusion of these particles dramatically increased the overall concentration of FM which could be blended into dodecane. The tribological behaviour of the particles produced, both with and without encapsulated FM, was tribologically tested in pure dodecane. The addition of as little as 1.5 wt% particles was found to decrease the friction coefficient and measured wear volumes below those for dodecane saturated with FM. Data suggests that the FM delivery method may be dominated by a bursting mechanism.

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“…For efficient lubrication by an emulsion the oil droplets need to be entrained preferentially into the contact region as the ball slides on the substrate. The emulsion forms a wedge in front of the slider and elastohydrodynamic calculations [5,15] show that smaller the droplets are, more likely, they are drawn towards the apex of the wedge than the bigger droplets are. The packing density for the smaller droplets in this region being higher [16,17] than that for the bigger droplets the smaller droplet becomes a source for larger volumes of oil being feed into the contact than what may be achieved with the bigger droplets.…”

Section: Force Regime Between the Droplets And The Substratementioning

confidence: 99%