Effect of Convective Hindrance Factor On Predictions of the Rejection of Rod Shaped Particles From Porous Membranes

摘要

The study of particle transport in liquid filled membranes is of significant importance in membrane separation processes. It is frequently observed that a particle experiences extra resistance to its motion in a bound region (pore space) compared to an unbound region which is called "hindrance phenomena". In the current research, the effect of the convective hindrance factor on the rejection coefficient of a rod-shaped particle in a membrane is theoretically studied. Computational Fluid Dynamics (CFD) calculations were performed to predict the lag coefficient of a rod-shaped particle within a narrow channel. Initial simulations involved solving the Navier Stokes equation defined in an Arbitrary Lagrangian Eulerian frame (moving mesh) to predict the translational motion of a rod-shaped particle at a fixed orientation where the rotational motion of the particle was neglected. The reflection coefficients were determined using a centerline approximation by integrating the lag coefficient over all sterically allowed particle orientations.