Fundamentals of Fluid Film Lubrication

Hamrock, B. J.; Schmid, Steven R.; Jacobson, Bo

doi:10.1201/9780203021187

Cited by 1,304 publications

(1,354 citation statements)

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“…In the case of pure hydrodynamic lubrication, as F n increases, the fluid thickness must get thinner in order to generate a higher positive pressure profile to support the applied normal load. The thinning of fluid also leads to a substantial increase in shear torque [9]. In Figure 3, it is apparent that the magnitude of average fluid thickness decreases as F n increases, leading to thinning of the fluid film.…”

Section: Fluid Thicknessmentioning

confidence: 93%

“…The major difference between 2D and 3D models is the presence of the radial component of fluid velocity in 3D which allows the flow to communicate in and out of the circumferential boundary as shown in Figure 7. Since 2D fluid flow does not have this additional degree of freedom, it causes drastic solid deformation resulting in significantly larger estimates of the load-supporting capacity [9].…”

Section: Discussionmentioning

confidence: 99%

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Finite element simulation of elastohydrodynamic lubrication of soft biological tissues

Moghani

Butler

Lin

et al. 2007

Computers & Structures

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In the serosal cavities (e.g. pleural, pericardial) soft tissues slide against each other, lubricated by thin fluid. We used rotational devices to study the tribology of such tissues, which appear to exhibit mixed and hydrodynamic lubrication. To explore mechanism, we modeled the interaction of fluid and soft material in 3D using a simple cylindrical geometry with an uneven solid-fluid interface in rotation. Deformation of the solid, frictional force, and fluid thickness are presented as a function of applied rotational velocity, applied normal load and material properties. The results suggest that the deformation caused by hydrodynamic pressure leads to load-supporting behavior.

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Section: Fluid Thicknessmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Finite element simulation of elastohydrodynamic lubrication of soft biological tissues

Moghani

Butler

Lin

et al. 2007

Computers & Structures

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“…Strictly speaking, this is a conservative estimate of the timescale because the drag coefficient γ for a sphere above a plate is larger than that of an isolated sphere. As the sphere approaches the plate, the drag is dominated by the "lubrication" problem of the fluid squeezed between the sphere and the plate, and the drag increases dramatically [44].…”

Section: B Stiction and Tunnelling Ratesmentioning

confidence: 99%

Casimir microsphere diclusters and three-body effects in fluids

et al. 2011

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Our previous article [Phys. Rev. Lett. 104, 060401 (2010)] predicted that Casimir forces induced by the material-dispersion properties of certain dielectrics can give rise to stable configurations of objects. This phenomenon was illustrated via a dicluster configuration of non-touching objects consisting of two spheres immersed in a fluid and suspended against gravity above a plate. Here, we examine these predictions from the perspective of a practical experiment and consider the influence of non-additive, three-body, and nonzero-temperature effects on the stability of the two spheres. We conclude that the presence of Brownian motion reduces the set of experimentally realizable silicon/teflon spherical diclusters to those consisting of layered micro-spheres, such as the hollowcore (spherical shells) considered here.

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“…One can consider that the direction of eccentricity is approximately the direction of loading, due to the low cross-coupling effects in aerostatic bearings [19]. Fig.…”

Section: Bearing Load Capacitymentioning

confidence: 99%

Ceramic matrices applied to aerostatic porous journal bearings: material characterization and bearing modeling

Silveira¹,

Nicoletti²,

Fortulan³

et al. 2010

Cerâmica

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This paper presents the development of an advanced ceramic material for manufacturing aerostatic porous bearing. The results show that there is homogeneous distribution of the pores in the alumina matrix by using different concentrations of the added component (sucrose). The average pore diameter remained around 0.14 µm and respective porosity around 28%, with small standard deviation. The mathematical model of the aerostatic porous bearing is presented, and numerical results indicate that the parameter related to porous medium (G) strongly affects the resultant bearing load capacity and stiffness. Considering the experimental and numerical results, the porous matrix obtained with 40% of sucrose concentration is more suitable for the aerostatic porous bearing application in study. Keywords: porous ceramic materials, aerostatic bearings, permeability identification, bearing modeling. Resumo Este trabalho apresenta o desenvolvimento de materiais cerâmicos porosos, obtidos a partir de cerâmicas estruturais (alumina), para a fabricação de mancais aerostáticos. Os resultados iniciais indicaram que, houve homogeneidade na distribuição dos poros na matriz de alumina, obtida com diferentes concentrações de agente poroso (sacarose). O valor médio dos poros foi de

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Fundamentals of Fluid Film Lubrication

Cited by 1,304 publications

References 0 publications

Finite element simulation of elastohydrodynamic lubrication of soft biological tissues

Finite element simulation of elastohydrodynamic lubrication of soft biological tissues

Casimir microsphere diclusters and three-body effects in fluids

Ceramic matrices applied to aerostatic porous journal bearings: material characterization and bearing modeling

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