Lubrication
Lubrication
Lubrication (pronunciation: /ˌluːbrɪˈkeɪʃ(ə)n/) is a process or technique employed to reduce friction between, and wear of, two surfaces that are in mutual contact with each other, by interposing a substance called a lubricant between them.
Etymology
The term 'lubrication' is derived from the Latin word 'lubricus', which means 'slippery or smooth'.
Types of Lubrication
There are three main types of lubrication: boundary lubrication, hydrodynamic lubrication, and elastohydrodynamic lubrication.
- Boundary Lubrication - This is the condition where the load is carried by the surface asperities rather than by the lubricant.
- Hydrodynamic Lubrication - This is a condition where the load is carried by pressure generated within the fluid due to the relative motion of the surface and the fluid.
- Elastohydrodynamic Lubrication - This is a condition where significant elastic deformation of the surfaces takes place and the shape of the lubricant film is greatly affected by the elastic deformation of the load-carrying surfaces.
Related Terms
- Friction - The resistance that one surface or object encounters when moving over another.
- Wear - The damage or gradual loss of material on a surface due to motion against another surface.
- Lubricant - A substance introduced to reduce friction between surfaces in mutual contact, which ultimately reduces the heat generated when the surfaces move.
- Viscosity - A measure of a fluid's resistance to flow. It describes the internal friction of a moving fluid.
- Asperity - A roughness or irregularity on a surface.
External links
- Medical encyclopedia article on Lubrication
- Wikipedia's article - Lubrication
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