纳米级二相流的润滑特性  

Exploring Lubrication Properties of Two-phase System at Nano-Scale

作　　者：张朝辉[1] 温诗铸[1] 雒建斌[1] 

机构地区：[1]清华大学摩擦学国家重点实验室

出　　处：《现代机械》2003年第4期1-3,共3页Modern Machinery

基　　金：国家自然学基金资助项目 (5 973 5 110 )

摘　　要：薄膜润滑是指两相对运动的表面间润滑特性由固体表面及润滑剂特性与润滑剂的粘度共同决定的一种特润滑状态。由于此时有序分子的决定作用 ,耦合效应对润滑特征的影响不能忽略。此时的张量描述和本构方程均与牛顿流体不同。本文考察了二相流 (固液两相 )的润滑。耦合应力的存在增加了润滑剂的粘度从而提高了油膜厚度和承载能力。耦合应力润滑下有尺寸效应 ,润滑膜越薄 。Thin film lubrication (TFL) is a lubrication regime where lubrication performances are determined by the combination of the properties of the solid surfaces,the properties of the lubricant,and the viscosity of the lubricant.The effects of cuple stress are no longer negligible because of the existence of the ordered molecules.The tensor measure and the constitutive equations of such fluids differ strongly from that of Newtonian fluids.The properties of two phases lubrication (solid-liquid phases)at nano scale are simulated.The couple stress will give rise to an increment in viscosity and subsequently thicker film and larger load capacity.Size-deperdent effects appear,and the thinner the lubricating film,the more the effects.

关 键 词：纳米级二相流 薄膜润滑 有序分子 耦合应力 固液两相 膜厚 

分 类 号：TH117.2[机械工程—机械设计及理论]