chapter  1
21 Pages


Osborne Reynolds developed in 1886 the fundamental basis for the hydrodynamic lubrication theory and the frictional resistance. The main advantage of boundary lubrication is to generate a thin fluid film on the surface which reduces the solid-to-solid contacts and consequently reduces friction, wear, and noise. Scientific study of the friction, lubrication, and wear phenomena in all the regimes is receiving considerable attention in modern engineering. M. J. Furey and J. K. Appeldoorn conducted an experiment to study the effect of lubricant viscosity on metallic contact and friction in the transition zone between hydrodynamic and boundary lubrication. Beauchamp Tower pointed out that without sufficient lubrication, the bearing operates in the boundary lubrication regime, whereas with adequate lubrication the two surfaces are completely separated by an oil film. In 1886, Osborne Reynolds published a paper on lubrication theory which is derived from the equations of motion, continuity equation, and Newton's shear stress-velocity gradient relation.