表面粗糙度对接触界面间流体流动的影响

Effect of surface roughness on fluid flow between contact interface

文章建立了粗糙接触界面间流动分析模型,研究了黏性流体在压力驱动状态下的流动特性。该模型将界面简化为两平板,用规则微凸体模拟表面粗糙度;定义了面积比、相对粗糙度2个物理量,并分析了它们对流动的速度、压强、壁面切应力的影响。结果表明,界面间层流阻力增加的来源是微凸体附近回流带来的较大压差阻力,用微凸体模拟粗糙度可简化实际复杂表面,通过改变微凸体的结构和分布可以分析工程中接触界面间的流动问题。

An analysis model of the flow between rough contact interface was established in order to research the flow characteristic of pressure-driven viscous fluid between two parallel plates. In this model, the interface was simplified to two parallel plates, with the regular micro-convex body to simulate the surface roughness. Area ratio and relative roughness were established and the effect of these two physical quantities on the velocity, pressure and wall shear stress of the flow was analyzed. The re- sults show that the reason why flow resistance increases is the large pressure resistance caused by the reeirculation near the micro-convex body. Using the micro-convex body to simulate surface roughness can simplify the actual surface, and by changing the structure and distribution of the micro-convex body, the flow problem in engineering contact interface can be analyzed by this model.