Showing papers on "Lubrication theory published in 1974"
149 citations
116 citations
TL;DR: In this paper, the forces and torques on two moving solid particles suspended in a fluid and almost in contact with each other were found in terms of their relative motion by using a type of lubrication theory.
106 citations
TL;DR: Evidence has been obtained for the elastohydrodynamic behaviour of erythrocytes traversing capillary pores of 7 μm diam and it appears that in the lowest velocity range (0–0.25 mm·sec−1), ery throatcytes maintain an effectively constant separation from the capillary wall.
35 citations
33 citations
23 citations
IBM1
TL;DR: The transition from boundary lubrication to fully hydrodynamic lubrication is investigated for air-lubricated slider bearings using the electrical resistance method and intermittent contacts are shown to exist even under conditions for which the numerical solution of the Reynolds equation or white light interferometry predicts steady state spacings.
Abstract: The transition from boundary lubrication to fully hydrodynamic lubrication is investigated for air-lubricated slider bearings using the electrical resistance method. Intermittent contacts are shown to exist even under conditions for which the numerical solution of the Reynolds equation or white light interferometry predicts steady state spacings in the spacing region from 0.125 to 0.25 µm. The transition is similar to the one found in the presence of liquid films, being influenced for a given surface roughness of disk and slider by load, speed, and hydrodynamic design.
22 citations
TL;DR: In this article, the hydrodynamic effects arising from non-Newtonian lubricants are investigated for a Rivlin-Ericksen third order fluid, and the proposed perturbation expansion agrees with Reynolds original lubrication approximation, and a consistent series of differential equations are obtained.
3 citations
2 citations
TL;DR: In this article, non-constant forms for the film thickness are constructed for which reduction of the two-dimensional problem to consideration of Laplace's equation is possible via Baecklund-type transformations; the approach is somewhat analogous to one adopted in gasdynamics to obtain canonical forms for systems descriptive of physical situations.
Abstract: In the case of constant film thickness, Reynolds' equation of plane lubrication theory reduces to Laplace's equation for the pressure distribution. In this paper, non-constant forms for the film thickness are constructed for which reduction of the two-dimensional problem to consideration of Laplace's equation is possible. This is achieved via Baecklund-type transformations; the approach is somewhat analogous to one adopted in gasdynamics and recently in other areas of Continuum Mechanics to obtain canonical forms for systems descriptive of physical situations.
1 citations
01 Apr 1974
TL;DR: In this paper, load-support mechanisms relating to accidential features characteristic of seal performance are proposed, which relax one or more of the assumptions in the classical theory and permit the theoretical prediction of load support.
Abstract: The basic aspect of parallel-surface lubrication that distinguishes it from other areas of lubrication technology is that classical lubrication theory does not predict the existence of a stable hydrodynamic film for steady-state, isothermal, incompressible flow between smooth, parallel surfaces. Hydrodynamic films between apparently parallel surfaces have been observed in practice and are often essential for the reliable performance of thrust bearings and seals. In order to account for this fortunate discrepancy between classical theory and experiment, load-support mechanisms relating to accidential features characteristic of seal performance, which relax one or more of the assumptions in the classical theory and permit the theoretical prediction of load support are proposed. Some of the features that have been analyzed are vibratory effects such as wobble and bounce, surface waviness, nonsymmetric rotation resulting from various types of misalignment, lubricant density change, non-Newtonian lubricant effects, and surface roughness.