NUMERICAL SIMULATIONS OF THE FLOW AND PARTICLE DEPOSITION PATTERNS IN MODEL LUNG AIRWAYS

摘要

The objective of this study is to find the flow and particle deposition patterns in model lung airways. The model is a five generations, 90 degrees non-planar structure with bifurcation angles arrange from 40 to 70 degrees. The local airflow velocity field is the dominant factor for the local concentration of the particles on the wall. The airflow field is obtained by solving three-dimensional Navier - Stokes equation with the standard k-e turbulence model and standard wall function. The trajectories of the solid particles are predicted by integrating the force balance on the particles, which is written in a Lagrangian reference frame. A one way coupled, stochastic model is used to model the influence of turbulence on particle trajectories. A segregated, implicit, steady and three dimension solver is used for the simulations. The Power Law method is used to discrete the transport equations.