What are lubricants explain the theories of lubrication?

Lubricant is a substance which is used to control (more often to reduce) friction and wear of the surfaces in a contact of the bodies in relative motion. Depending on its nature, lubricants are also used to eliminate heat and wear debris, supply additives into the contact, transmit power, protect, seal.

What is lubrication forces?

Lubrication force is a hydrodynamic viscous force arising from radial pressure in the interstitial fluid being squeezed from the space between two close solid surfaces.

What fluids are in the respiratory system?

For liquid ventilation, a perfluorocarbon fluid, which can carry high amounts of oxygen and carbon dioxide, is used to cycle the lung instead of a gas.

What is Stokesian fluid?

Stokes flow (named after George Gabriel Stokes), also named creeping flow or creeping motion, is a type of fluid flow where advective inertial forces are small compared with viscous forces. The Reynolds number is low, i.e. .

How is fluid drawn out of the lungs?

If a more long-term solution is needed, a chest tube is inserted into the pleural space and connected to suction, says WebMD. With this procedure, fluid is often drawn out for several days. Pleurodesis helps prevent pleural effusion from returning, WebMD reports.

Which is an example of lubrication in fluid dynamics?

In fluid dynamics, lubrication theory describes the flow of fluids (liquids or gases) in a geometry in which one dimension is significantly smaller than the others. An example is the flow above air hockey tables, where the thickness of the air layer beneath the puck is much smaller than the dimensions…

What is the purpose of internal flow lubrication theory?

Internal flow lubrication theory has many industrial applications because of its role in the design of fluid bearings. Here a key goal of lubrication theory is to determine the pressure distribution in the fluid volume, and hence the forces on the bearing components. The working fluid in this case is often termed a lubricant.

Which is the lubrication approximation in 2.2.9?

Hence (2.2.9) and (2.2.14) can be called the lubrication approximation. We leave it as an exercise to show by similar normalization, that the dynamic boundary conditions on y = h can be approximated to the leading order by ∂u ∂y = 0 (2.2.17) for the tangential stress, and p = 0 (2.2.18) for the normal stress.