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Title: A computational investigation of particle distribution and deposition in a 90 degrees bend incorporating a particle-wall model
Authors: Sun, K
Lu, L 
Jiang, H
Keywords: Particle flow
Distribution and deposition 90 degrees bend
Particle-wall collision
Issue Date: 2011
Publisher: Pergamon Press
Source: Building and environment, 2011, v. 46, no. 6, p. 1251-1262 How to cite?
Journal: Building and environment 
Abstract: This paper investigates the particle flow movement and deposition in a 90 bend after a straight duct, utilizing the Lagrangian particle-tracking model incorporated with a particle-wall collision model. Particle turbulent dispersion is introduced by employing the 'eddy lifetime' model, and particle deposition velocity in the bend is proposed by counting the number of deposited trajectories in a time period. The developed models are validated for both airflow and particle flow by previous experimental data. Particle distribution and deposition behavior at five size groups (1, 3, 5, 9, and 16 pm) are investigated. The simulation results show that, compared with traditional 'Trap' model, the particle-wall collision model postpones the emergence and slows the increase of the 'particle free zone' as the particle diameter increases. Particle deposition velocity in the duct bend is also generally predicted by the proposed estimation equation under the simulated conditions. This reveals that adopting the particle-wall collision model obtains a reasonable prediction of particle distribution and deposition in the duct bend. This work will benefit the understanding and application of microparticle flow in curved duct systems.
ISSN: 0360-1323
EISSN: 1873-684X
DOI: 10.1016/j.buildenv.2010.12.006
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