| The classical Reynolds lubrication theory is based on the no wall-slip assumption.During the recentyears many experi ments reported evidences of wall slip occurring in a fluid fil mflow.The flow behavior and hy-drodynamic response of a fluid fil m confined between two solid surfaces are studied in the present paper.It isfound that wall slip dramatically affects hydrodynamics of the fluid fil m.The hydrodynamic pressure is not onlyaffected by the fluid viscosity and gap geometry,but also strongly controlled by wall slip and by what a surfacemoves.By controlling the surface adhesion property,even a zero friction surface can be obtained.On the otherhand,if the two surfaces of a sliding gap have the same slip property,a critical sliding speed exists for the fluidhydrodynamic response to totally disappear.In pure rolling,however,a considerable hydrodynamic response stillexists even the surface li miting shear stress is small. |