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مکانیک::
روانکاری هیدرودینامیک
In between these regimes, there is a mixed or partial lubrication regime where the transition from boundary to hydrodynamic lubrication occurs.
Hydrodynamic lubrication conditions occur when the shape and relative motion of the sliding surfaces form a liquid film in which there is sufficient pressure to keep the surfaces separated.
Full hydrodynamic lubrication or viscous friction is independent of the material or roughness of the parts, and the only property of the lubricant involved is its viscosity.
Hydrodynamic lubrication is present between two converging surfaces, moving at relatively high speed in relation to each other and withstanding a limited load, each time an oil film can be formed.
Hydrodynamic lubrication breaks down when the thickness of the fluid film becomes about the same as the height of the surface asperities.
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