Abstract: The viscosity modification formula has been proposed on the base of data obtained form experimental results in thin film lubrication regime, on which the equations for computing film thickness in the contact region are got. The comparison among the results coming from the calculation results of thin film lubrication (TFL), elastohydrodynamic lubrication (EHL) and experimental data shows that the relationships of film thickness vs. velocity & viscosity in TFL are much different from that in EHL and our calculated results accord with the experimental data well. Moreover, the transition from EHL to TFL is also obvious in the calculated curve.

Key words: Film height, Thin film lubrication, Viscosity modification