固体颗粒在逾渗多孔介质中的吸附特性

Study on the performance of the solid particle adsorbed by porous media

采用数值计算的方法,通过求解描述低速流体流动的Stokes方程以及简化的颗粒运动方程,初步得到颗粒在逾渗多孔介质中的运动轨迹,并在此基础上,求得颗粒与多孔介质内表面的碰撞概率,进而研究颗粒的被吸附特性.数值结果表明均匀多孔介质和分形多孔介质对颗粒的吸附存在本质差异.颗粒流出概率(实际中常表示为出口悬浮液中的颗粒浓度)与多孔床深度间的指数关系仅对均匀多孔介质成立,而对分形多孔介质并不成立.

The motion path of particle in porous media is preliminarily obtained by numerically solving the Stokes equation describing the flow of low-speed fluid and simplified particle motion equation.Based on this,the collision probability between the particle and the inner surface of the media pore is got and then the performance of the particle being adsorbed is studied.The numerical result shows that,there is a natural difference between the adsorption of homogeneous porous media and fractal porous media to the particle,and the exponential relation between the particle flowing-out probability and the depth of porous bed is only suitable to homogeneous porous media but not suitable to fractal porous media.