Characteristics of lubrication at nanoscale in two-phase fluid system  

作　　者：张朝辉 温诗铸 雒建斌 

出　　处：《Science China Chemistry》2002年第2期166-172,共7页中国科学（化学英文版）

基　　金：Nomenclature: τ, stress tensor; ρ, density; a, acceleration (m/s2);f, body force (N);p, pressure (Pa); λ, second viscosity coefficient; d, strain tensor; δ, sign function; η, material constant responsible for couple stress parameter; μ dynamic visc

摘　　要：Thin film lubrication (TFL) is a condition in which the lubricating features between two surfaces in relative motion are determined by the combination of the properties of the surfaces and the lubricant and viscosity of the lubricant. The effects imposed by couple stress on lubrication characteristics cannot be disregarded in this regime where the ordered molecules dominate the fluid field. There are different tensor measures and constitutive equations in this case other than Newtonian case. The lubrication of two-phase (solid phase and liquid phase) fluid is investigated in this paper. The existence of couple stress will enhance the lubricant viscosity and hence increase the film thickness and improve the load-carrying capability. Size-dependent effects can be seen in the lubrication with couple stress, and the thinner the lubricating film is, the more obvious the effect will be.Thin film lubrication (TFL) is a condition in which the lubricating features between two surfaces in relative motion are determined by the combination of the properties of the surfaces and the lubricant and viscosity of the lubricant. The effects imposed by couple stress on lubrication characteristics cannot be disregarded in this regime where the ordered molecules dominate the fluid field. There are different tensor measures and constitutive equations in this case other than Newtonian case. The lubrication of two-phase (solid phase and liquid phase) fluid is investigated in this paper. The existence of couple stress will enhance the lubricant viscosity and hence increase the film thickness and improve the load-carrying capability. Size-dependent effects can be seen in the lubrication with couple stress, and the thinner the lubricating film is, the more obvious the effect will be.

关 键 词：thin film lubrication  ORDERED molecule  COUPLE stress  TWO-PHASE fluid. 

分 类 号：TE626[石油与天然气工程—油气加工工程]