碰撞恢复系数对单纤维颗粒捕集特性的影响

Effect of the Restitution Coefficient on the Particle Trapping Characteristics of the Single-fiber Filter Media

利用CFD-DEM耦合方法对单纤维过滤介质进行了气-固两相流的数值模拟,研究了颗粒和纤维体间碰撞恢复系数的变化对颗粒在单纤维体上的沉积及捕集特性的影响。结果表明,颗粒的粒径较小时,纤维体捕集颗粒数量较少,且颗粒较为发散,而当颗粒的粒径较大时,颗粒被纤维体捕集的数量明显增加。颗粒的捕集数量随颗粒与纤维体间的恢复系数呈先增加后减少,然后达到平稳状态的趋势,颗粒与纤维体间的恢复系数超过0.3时,颗粒的捕集效率趋向于一个稳定值。

CFD-DEM coupling method was used to simulate the gas-solid two-phase flow for the single-fiber filter media in this study, and the effect of the restitution coefficient between the particle and fiber on the particle deposition and trapping characteristics in the single fiber body was analyzed. The results showed that the number of trapped particles in the fiber bodies was less when the particle diameter was small, and the particles were more divergent. When the particle diameter was large, the number of trapped particles in the fiber bodies increased obviously. In addition, the number of trapped particles increased with the restitution coefficient between the particle and fiber first, and then decreased, lastly reached a steady state. When the restitution coefficient was more than 0.3, the trapping efficiency tended to a stable value.