Particle deposition in 90 bends - Comparison of different CFD models

This paper investigates the particle flow movement and deposition in a 90 bend after a straight duct by utilizing the Lagrangian particle-tracking model incorporated with a particle-wall collision model. Different turbulent and near-wall models of computational fluid dynamics (CFD) are compared to find their advantages and limitations for predicting particle movement. These models are validated for both airflow and particle flow by previous experimental data. Particle distribution and deposition behaviors at five size groups (1, 3, 5, 9, and 16 μm) are investigated. The results reveal that turbulent models varied in a considerable degree, i.e. about 2-3 times, when predicting the particle deposition velocities within the simulated scale t+=0.149-3.29. These findings will benefit the understanding of contaminant particle movement in ventilation systems.