Abstract: Based on the ordered model suitable for TFL (This film Lubrication) with lubricants composed of nermatic molecules, the basic lubrication principles and characteristics in TFL are investigated by using micropolar theories. In TFL where tribology properties varying from EHL (elastohydrodynamic lubrication ) to BL (boundary lubrication), the relationship between the film thickness and the variance of working parameters such as velocities and outside loads does not accord with THL theory well, However, the results deduced from micropolar theory can accord with it well. The effects of existence of the ordered thin film are in accord with the enhancement of lubricant viscosity through which thicken the film and enlarge the carry-loading ability. The conservation of angular momentum must be taken into account in TFL regime.

Key words: Lubricating characteristic, Micropolar fluids, Nematic molecule, Thin film lubrication