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Tribology: Lubrication Hydrodynamics
http://www.aciconsultora.com.ar/sitio/boletin.php?bole=4
action occurs when the relative motion between two lubricated surfaces creates a sufficient lubricating film thick to prevent any metal-metal contact. This meant that it is minimum film thickness is slightly higher than the average amount of irregularities of both surfaces and resistance to movement is given only by the friction between the layers of lubricant, the latter which fully supports the load. In this case, the lubrication conditions are optimal and the mechanism may operate for long time without any wear, as long as they keep these operating conditions.
Hydrodynamic lubrication requires an adequate flow of lubricant to keep separate the two surfaces. When one of the elements (or both) are moving on, the hydraulic action of the oil produces a convergent wedge, which develops pressures above 50,000 psi in the work zone, avoiding metal contact between the two surfaces.
The hydrodynamic lubrication theory has its origins in the laboratory of Beachump Tower, in the 1880's in England. That made a series of plain bearings lubricated expermentos. One of these consisted of placing a shaft in an oil bath and put it to spin, the half bearing that supports it (on top) had a hole for lubrication. However, to turn the shaft the oil came under some pressure by that hole, the colcársele a stopper, he was expelled slowly being implemented. Then a gauge mounted in the hole and saw that the pressure of oil film was about twice the average pressure based on the projected area of \u200b\u200bbearing (W / LD). Later there was another series of experiments to determine the hydraulic pressure distribution along the periphery of the roller bearings. (See figure) 
http://www.aciconsultora.com.ar/sitio/boletin.php?bole=4
action occurs when the relative motion between two lubricated surfaces creates a sufficient lubricating film thick to prevent any metal-metal contact. This meant that it is minimum film thickness is slightly higher than the average amount of irregularities of both surfaces and resistance to movement is given only by the friction between the layers of lubricant, the latter which fully supports the load. In this case, the lubrication conditions are optimal and the mechanism may operate for long time without any wear, as long as they keep these operating conditions.
Hydrodynamic lubrication requires an adequate flow of lubricant to keep separate the two surfaces. When one of the elements (or both) are moving on, the hydraulic action of the oil produces a convergent wedge, which develops pressures above 50,000 psi in the work zone, avoiding metal contact between the two surfaces.
The hydrodynamic lubrication theory has its origins in the laboratory of Beachump Tower, in the 1880's in England. That made a series of plain bearings lubricated expermentos. One of these consisted of placing a shaft in an oil bath and put it to spin, the half bearing that supports it (on top) had a hole for lubrication. However, to turn the shaft the oil came under some pressure by that hole, the colcársele a stopper, he was expelled slowly being implemented. Then a gauge mounted in the hole and saw that the pressure of oil film was about twice the average pressure based on the projected area of \u200b\u200bbearing (W / LD). Later there was another series of experiments to determine the hydraulic pressure distribution along the periphery of the roller bearings. (See figure)
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