Where is boundary lubrication used?
Boundary lubrication mostly occurs under high-load and low-speed conditions in bearings, gears, piston rings, pumps, transmissions, etc. It usually represents the critical regime that limits the life of components.
What is lubrication of articular cartilage?
Cartilage Friction and Osteoarthritis. When in health, the articular cartilage (see Figure 1 for a schematic) is a self-lubricating, self-healing system, actively maintaining the lubrication between the opposing sliding surfaces of the joints over their lifetime.
What is joint lubrication?
Joint lubrication decreases the friction between cartilage and allows for natural and painless joint movement.
What is fluid lubrication?
Abstract. Fluid film lubrication occurs when opposing surfaces are completely separated by a lubricant film and no asperities are in contact. The applied load is carried by pressure generated within the fluid, and frictional resistance to motion arises entirely from the shearing of the viscous fluid.
What is called lubrication?
Lubrication is the process or technique of using a lubricant to reduce friction and wear and tear in a contact between two surfaces.
Is articular cartilage lubricated?
Articular cartilage distributes forces and lubricates the contact surfaces between articulating long bones, as in the knee.
What do you mean by lubricant?
Definition of lubricant 1 : a substance (such as grease) capable of reducing friction, heat, and wear when introduced as a film between solid surfaces. 2 : something that lessens or prevents friction or difficulty a social lubricant.
What do you mean by lubricating oil?
Lubricating oil is a thick fatty oil used to make the parts of a machine move smoothly. Lubricating oils are specially formulated oils that reduce friction between moving parts and help maintain mechanical parts. Lubricating oil is a thick fatty oil used to make the parts of a machine move smoothly.
What do you mean by Lubrication?
Definition of ‘lubrication’ Lubrication involves adding a substance between solid surfaces that are moving against each other in order to reduce friction and wear. It is important to use a good-quality grease for lubrication of the bearings. The basic purpose of lubrication is to minimize friction and wear.
What do you need to know about boundary lubrication?
Boundary Lubrication. Boundary lubrication is defined as that in which the sliding surfaces are separated by a very thin molecular film of lubricant, so that the chemical and physical natures of the surfaces and the lubricant are of major importance. From: Biomaterials and Regenerative Medicine in Ophthalmology (Second Edition), 2016.
How is the lubricant absorbed into the bearing surface?
Boundary lubrication involves a single monolayer of lubricant molecules, which are absorbed onto each of the bearing surfaces. This avoids surface wear by impeding the direct contact of surfaces (Hsu and Gates, 2000 ).
How is boundary lubrication used in articular cartilage?
These two layers (1–100 nm in thickness) effectively serve to reduce friction and help to prevent cartilaginous wear. Both film fluid and boundary lubrication types occur in articular cartilage under varying situations.
How is lubrication used to keep moving surfaces separated?
By lubrication we keep the moving surfaces separated by a fluid of some defined property. Considering the nature of motion between moving or sliding surfaces, there are different types of mechanisms by which the lubrication is done.