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A lubricant (sometimes shortened to lube) is a substance that helps to reduce friction between surfaces in mutual contact, which ultimately reduces the heat generated when the surfaces move. It may also have the function of transmitting forces, transporting foreign particles, or heating or cooling the surfaces.
Tribology is the science and engineering of understanding friction, lubrication and wear phenomena for interacting surfaces in relative motion.It is highly interdisciplinary, drawing on many academic fields, including physics, chemistry, materials science, mathematics, biology and engineering. [1]
[5] [6] Contact between raised solid features, or asperities, can also occur, leading to a mixed-lubrication or boundary lubrication regime. Boundary lubrication is defined as the regime in which the load is carried by the surface asperities (high points) rather than by the lubricant. [ 7 ]
Fluid friction describes the friction between layers of a viscous fluid that are moving relative to each other. [7] [8] Lubricated friction is a case of fluid friction where a lubricant fluid separates two solid surfaces. [9] [10] [11] Skin friction is a component of drag, the force resisting the motion of a fluid across the surface of a body.
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Parasitic drag in water or air increases with the square of speed (V B 2 or V A 2, respectively); [11] [12] rolling friction increases linearly with velocity; [13] whereas kinetic friction is normally a constant, [14] but on ice may become reduced with speed as it transitions to lubricated friction with melting. [5] Ways to reduce wave-making ...
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