论文部分内容阅读
在一个轴对称、外形任意的多孔介质二维体中,充满了有屈服应力的非Newton幂律流体时,数值分析其自由对流及其传热/传质问题.利用相似变换,将边界层控制方程及其边界条件变换为无量纲形式,然后用有限差分法求解该方程组.所研究的参数为流变常数、浮力比和Lewis数.给出并讨论了典型的速度、温度及浓度曲线.发现屈服应力参数值和非Newton流体的幂律指数对结果有着显著的影响.
When a non-Newton power law fluid with yield stress is filled in an axisymmetric and arbitrary shape two-dimensional porous media, the free convection and its heat and mass transfer problems are numerically analyzed. By using similar transformation, the boundary layer control The equations and their boundary conditions are transformed into dimensionless forms, and then the system is solved by the finite difference method.The parameters studied are the rheological constants, the buoyancy ratio and the Lewis number.The typical velocity, temperature and concentration curves are given and discussed. It is found that the parameters of yield stress and power law index of non-Newton fluid have a significant effect on the result.