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摘要
The dynamic and non-continuum effects in a nano slider bearing is analytically studied by using the flow factor approach model for the confined nano fluid flow. It is found out that even when two coupled sliding solid surfaces are smooth and parallel or form a divergent gap, the pressure and then the load-carrying capacity can be generated within the molecularly thin fluid film confined between these two surfaces, if the interaction between the confined film and the solid surface in the bearing inlet zone is stronger than that in the bearing outlet zone. This load-carrying capacity generation is owing to the dynamic effect of the confined film contributing by the average density across the film thickness of the confined film in the bearing inlet zone being greater than that in the bearing outlet zone. However, in these cases, the non-continuum effect of the confined film due to the discontinuity and inhomogeneity across the film thickness of the confined film also contributes significantly to the load-carrying capacity of the confined film. When the two sliding solid surfaces form a convergent nanoscale gap, the load-carrying capacity of the confined film is normally significantly increased, compared to the conventional theory prediction. This load-carrying capacity enhancement is due to the non-continuum effect of the confined film, which normally reduces significantly the magnitude of the flowing velocity of the Poiseuille flow of the confined film both in the bearing inlet and outlet zones. In this case, when the interaction between the confined film and the solid surface is strong, a great load-carrying capacity can be generated between the coupled surfaces, even when the nanoscale surface gap has a very small convergence.
- 出版日期2016
- 单位常州大学
