Characteristics of lubrication at nanoscale in two-phase fluid system*
SCIENCE IN CHINA (Series B) April 2002 Vol. 45 No.2，-0001，（）：
Thin film lubrication (TFL) is a condition in which the lubricating features between twosurfaces in relative motion are determined by the combination of the properties of the surfaces andthe lubricant and viscosity of the lubricant. The effects imposed by couple stress on lubricationcharacteristics cannot be disregarded in this regime where the ordered molecules dominate thefluid field. There are different tensor measures and constitutive equations in this case other thanNewtonian case. The lubrication of two-phase (solid phase and liquid phase) fluid is investigated inthis paper. The existence of couple stress will enhance the lubricant viscosity and hence increasethe film thickness and improve the load-carrying capability. Size-dependent effects can be seen inthe lubrication with couple stress, and the thinner the lubricating film is, the more obvious the effectwill be.
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