粉尘颗粒在单纤维表面沉积的计算机模拟

Simulation of deposition of aerosol particles on a single fiber surface

采用随机模拟方法模拟研究了粉尘颗粒在单纤维表面上的沉积过程,Kuwabara流场用于计算粉尘颗粒运动的轨迹,模拟中考虑了粉尘颗粒的粒径分布和单纤维在气流作用下的扭曲行为对粉尘颗粒沉积的影响。模拟结果表明,粉尘颗粒在单纤维表面上的沉积形态与分布特征依赖于Stokes数、粉尘颗粒粒径分布和纤维扭曲程度;模拟获得的粉尘树枝结构与相关文献提供的实验结果相似。

The stochastic simulation method was applied to solve the deposition problem of particles from the flowing suspensions onto a fiber collector. The model filter was represented by an array of parallel cylindrical fibers and the Kuwabara flow field was employed to determine the particles trajectories inside the filter. The effects of the particle size distribution and the twist deformation of the fiber on the deposition morphology of particles onto a collector were investigated. The simulation results showed that morphology of particle dendritic and the distribution of deposits around the fiber depend on Stokes number, the particle size distribution and the twist deformation of the fiber. The morphology of deposit obtained in the simulated results appears to agree well with other experimental results reported in literature.