1. Measurement of lubricity

2. Lubricity in diesel engines

3. See also

4. References

Lubricity is the measure of the reduction in friction and or wear by a lubricant. The study of lubrication and wear mechanisms is called tribology.

Measurement of lubricity

The lubricity of a substance is not a material property, and cannot be measured directly. Tests are performed to quantify a lubricant's performance for a specific system. This is often done by determining how much wear is caused to a surface by a given wear-inducing object in a given amount of time. Other factors such as surface size, temperature, and pressure are also specified. For two fluids with the same viscosity, the one that results in a smaller wear scar is considered to have higher lubricity. For this reason lubricity is also termed a substance's anti-wear property.

Examples of test setups include "Ball-on-cylinder" and "Ball-on-three-discs" tests.

Lubricity in diesel engines

In a modern diesel engine, the fuel is part of the engine lubrication process. Diesel fuel naturally contains compounds that provide lubricity, but because of regulations in many countries (such as the US and the EU countries), sulphur must be removed from the fuel before it can be sold. The hydrotreatment of diesel fuel to remove sulphur also removes the compounds that provide lubricity. Reformulated diesel fuel that does not have biodiesel added has a lower lubricity and requires lubricity improving additives to prevent excessive engine wear.^{[1] [2] [3]}

See also

• Boundary lubrication
• Superlubricity
• Tribology

References

• British National Oil Company
• British National Opera
• British National Opera Company
• British National (Overseas) - extra information
• British National (Overseas) passport
• British National Party (1942)
• British National Party (disambiguation)
• British national party election results
• British National Party election results
• British National Rail
• British National Space Center
• British National Stayers Championships
• British National Tandem Sprint Championships
• British National Team Pursuit Championships
• British National Team Sprint Championships
• British National Time Trial Championships
• British National Track Championships
• British naturalization
• British Naval Aviation
• British naval blockade of Germany
• British Naval Division
• British naval forces in the falklands war
• British naval history
• British neocon philosophers
• British neoconservatism