Lubrication of machine parts is necessary to prevent friction and wear in operation. However, oxidation lubricants upon operation changes their chemical physical properties causes lubrication performance deteriorate. Besides, one liter wasted/used lubricant oil can contaminate a million liters water. Current methods for the timely detection deterioration lack practicality. Here we show simple, ...

This review article summarizes recent progress in investigation of nano-rheology and thin film lubrication, as well as their contributions to conventional tribology. As the thickness of a lubricating film becomes comparable to molecular dimensions, a lubricant confined between solid walls undergoes a dramatic transition in its rheological properties and physical state, including the formation o...

Relative motion between soft wet solids arises in a number of applications in natural and artificial settings, and invariably couples elastic deformation fluid flow. We explore this in a minimal setting by considering a fluid-immersed negatively buoyant cylinder moving along a soft inclined wall. Our experiments show that there is an emergent robust steady-state sliding regime of the cylinder w...

Elastohydrodynamic lubrication (EHL) modelling plays an important role in engineering design and analysis since a number of important mechanical components operate under EHL conditions. In this paper methods are presented for solving both line and point contact cases using multiphysics software. The advantages, and the overheads, of using such an approach over developing highly specialised, bes...

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...

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 ...

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...

The tribology of 2-methacryloyloxyethyl phosphorylcholine monolayers in water is studied using molecular dynamics simulations. Our results show two distinct shear regimes where the first is dominated by hydration lubrication, exhibiting near zero friction coefficients, and the second by chain-chain interactions, resembling monomer-supported lubrication. These results provide insight into the hy...

The hydrodynamic lubrication of the teeth of the gaterotor in a single screw compressor differs from the well-known lubrication of bearings. This difference can be related to the constrained fluid film geometry and the conditions of the lubrication. Under these circumstances the convective fluid inertia will affect the performance of the lubrication. During meshing, variations of the filmgeomet...