摘要
了解旋转管式膜分离器内的流体流动对于了解其分离机理甚为重要。论文首先介绍膜分离器的结构，得出定常流动时膜分离器环隙间流体切向速度表达式和分布曲线；然后建立了流体运动N-S方程，采用摄动法和贝塞尔函数方法, 得出流动失稳时内筒的临界转速，导出环隙间流体径向速度和流线的近似表达式。当内筒转速超过临界转速时, 环隙间将生成Taylor涡。最后，绘制了环隙间径向速度分布曲线和Taylor涡流线。
The flow field in the annular gap of a rotary tubular membrane separator is of great importance for its separating mechanism. Firstly, the structure of the rotary tubular membrane separator was introduced and the expression and distribution curve of tangential velocity in the annular gap of the separator under steady flow was obtained. Then Navier-Stokes equation of fluid flow was constructed and critical angular velocity of inner cylinder was deduced by symmetrical disturbance and Bessel function methods. When angular velocity of the inner cylinder exceeded the critical velocity, Taylor vortices appeared in annular gap. Taylor vortices could reduce membrane fouling, thus the performance of the separator could be improved. Approximate expressions of stream function and radial velocity were also given out. In the end, distribution curve of radial velocity and the streamlines of Taylor vortices were plotted.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2000年第6期524-529,共6页
Journal of Chemical Engineering of Chinese Universities
基金
高速水力国家重点实验室开放基金
关键词
旋转管式膜分离器
环隙间流体
速度
数值模拟
rotary tubular membrane separator； disturbance； Bessel function； Taylor vortices； numerical simulation
