Articular cartilage is an example of a highly efficacious water-based, natural lubrication system that is optimized to provide low friction and wear protection at both low and high loads and sliding velocities. One of the secrets of cartilage's superior tribology comes from a unique, multimodal lubrication strategy consisting of both a fluid pressurization mediated lubrication mechanism and a b...

Many real-world examples of fluid-structure interaction, including the transit of red blood cells through the narrow slits in the spleen and the intracellular trafficking of vesicles into dendritic spines, involve the near-contact of elastic structures separated by thin layers of fluid. Motivated by such problems, we introduce an immersed boundary method that uses elements of lubrication theory...

The lubrication regime of articulating surfaces plays an important role for the understanding of the tribological conditions and the resulting wear performance of total disc replacement (TDR) of the spine. In the present study the lubrication regime for lumbar TDRs with ball and socket design have been assessed by applying the Hamrock-Dawson elasto-hydrodynamic lubrication theory. The effect of...

Lubrication plays an important role in the clinical performance of the ceramic-on-ceramic (CoC) hip implant in terms of reducing wear and avoiding squeaking. All the previous lubrication analyses of CoC hip implants assumed that synovial fluid was sufficiently supplied to the contact area. The aim of this study was to investigate the lubrication performance of the CoC hip implant under starved ...

Surfaces can be slippery or sticky depending on surface chemistry and roughness. We demonstrate in atomistic simulations that regular and random slip patterns on a surface lead to pressure excursions within a lubricated contact that increase quadratically with decreasing contact separation. This is captured well by a simple hydrodynamic model including wall slip. We predict with this model that...

th Australasian Fluid Mechanics Conference Monash University Melbourne Australia December A new laser interferometry skin friction meter was built and was used to measure skin friction in a series of turbulent boundary layer ows This method has the advantage of providing a direct measure of skin friction through thin lm lubrication theory It does not rely on the existence of a law of the wall o...

Ausführungen, die wörtlich oder sinngemäÿ übernommen wurden, sind als solche gekennzeichnet. The lubrication force is an important problem in simulations of suspended particles with the lattice Boltzmann method. When two particles approach each other and get near contact, closer than the lattice spacing, the thin layer of uid, still left between the particles, cannot be suciently simulated, whi...

A heavy sphere is free to move inside a rotating horizontal cylinder filled with viscous liquid. The steady motion is essentially Stokesian, and the sphere rotates at a fixed location with a lubrication layer between the ball and the wall. The symmetry of the flow field suggests there will be no force to balance the normal component of the ball's weight. However, we show that a normal force can...

The primary objective of present investigation is to introduce the novel aspect of thermophoresis in the mixed convective peristaltic transport of viscous nanofluid. Viscous dissipation and Joule heating are also taken into account. Problem is modeled using the lubrication approach. Resulting system of equations is solved numerically. Effects of sundry parameters on the velocity, temperature, c...

The elastohydrodynanlic force on two slightly defornlable bodies approaching one another head on is calculated in the limit of small gap sizes and small defornlations by combining Hertz's theory of deformation and lubrication theory. An expression for the lubrication force analytical in the deformation and gap size is obtained. The effect of the gap size, the elasticity and the velocity of appr...