CFD-DEM simulation of particle transport and deposition in pulmonary airway
CFD-DEM simulation of particle transport and deposition in pulmonary airway
复制标题
CFD→DEM 模拟肺气道中的颗粒传输和沉积
DOI：
10.1016/j.powtec.2012.05.041
复制
发表时间：
2012-09-01
影响因子：
5.2
通讯作者：
Sun, Baobin
中科院分区：
文献类型：
--
作者：
Chen, Xiaole;Zhong, Wenqi;Sun, Baobin
计算流体动力学(CFD)-离散元法（DEM）方法考虑了颗粒碰撞和颗粒旋转的影响以及颗粒在流体中所占体积的影响，能够较好地预测强耦合气固流动行为和非球形颗粒的运动，在模拟肺泡区和纤维状颗粒的输运和沉积方面具有良好的潜力。CFD-DEM用于研究人体气道中颗粒的迁移和沉积特征。第3代至第5代的理想肺气道模型已经建立，使用与Kim和Fisher先前进行的实验相同的几何参数（C. S. Kim和D. M. Fisher. 1999）。预测的沉积效率与实验数据吻合较好。因此。CFD-DEM能较好地模拟颗粒在气道内的行为。在仿真的基础上，通过分析粒子在不同时间间隔的位置，研究了粒子的运动。结果表明，粒子的初始位置对其运动轨迹有显著影响。近壁颗粒在子管中均匀分布，当它们穿过气道时。入口处最中心的颗粒通过第5代的内侧管穿过模型。随着粒子初始位置与管中心距离的增加，其他粒子的运动轨迹也会从管内向上一代的外侧运动轨迹偏移。(C) 2012年Elsevier B.V.出版
Including the effects of particle-particle collision and particle rotation as well as the volume of particle occupied in the fluid, the Computational Fluid Dynamics (CFD)-Discrete Element Method (DEM) approach could properly predict the behavior of gas-solid flow with strong coupling and the motion of non-spherical particle, thus show good potential in simulations of alveolar region and fibrous particle transport and deposition. CFD-DEM has been developed to investigate the particle transport and deposition characteristics in human airway. An idealized pulmonary airway model of generations 3 to 5 has been established using the same geometric parameters as previous experiment conducted by Kim and Fisher (C. S. Kim and D. M. Fisher. 1999). The predicted deposition efficiencies are in good agreement with experimental data. Thus. CFD-DEM could properly simulate the particle behaviors in pulmonary airway. Based on the simulations, particle motions are studied by analyzing the particle positions at different time intervals. The results show that the initial position of particle would notably affect its trajectory. The near wall particles distribute evenly in the daughter tubes when they cross the airway. The most centered particles at inlet travel through the model via the inner side tubes of generation 5. The trajectories of other particles would shift from the inside tubes to the lateral ones of last generation as the distance between particle initial position and tube center increases. (C) 2012 Published by Elsevier B.V.