摘要
固液边界的滑移现象成为微纳流动系统中不可忽略的因素。为了揭示固液边界滑移规律对流动行为的影响及其临界尺度效应,应用ANSYS软件建立同轴旋转圆柱体间不可压缩液体的物理模型;在层流模式下,采用不同边界条件分析不同旋转速度下微纳间隙区域内液体的流动特性。结果表明:无滑移边界条件下,微间隙的流场速度分布曲线存在0.7 mm的临界间隙尺寸;有滑移边界条件下,外圆筒壁面滑移对系统阻力矩的影响存在尺寸效应,内圆筒壁面滑移对系统阻力矩有明显作用,但无尺寸效应。
The solid-liquid boundary slip can not be ignored in the current micro-nano flow system. In order to reveal the laws of the solid-liquid boundary slip flow behavior and its critical scale effect, a physical model of incompressible liquid between rotating coaxial cylinders was created by using ANSYS. In the laminar flow mode, the flow characteristics of micro-nano gap region under different rotational speed were analyzed by using different boundary conditions. The results show that the critical gap size is 0. 7 mm in the no-slip boundary condition. The outer cylinder wall slip has a size effect to system torque, although the size effect is disappeared under the slip on inner cylinder. However, the wall slip on inner cyl- inder affects on system torque obviously.
出处
《润滑与密封》
CAS
CSCD
北大核心
2013年第11期9-13,共5页
Lubrication Engineering
基金
国家重大基础研究发展计划项目(973计划)(2012CB934101)
