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Volume 13, No. 2, April 2013, Pages 786-794 PDF(1.1 MB)  
doi: 10.4209/aaqr.2012.04.0106   

Numerical Investigation of the Wall Effect on Airborne Particle Dispersion in a Test Chamber

Hanhui Jin1, Chao He1, Lin Lu2, Jianren Fan3

1 School of Aeronautics and Astronautics, Zhejiang University, Hangzhou 310027, China
2 Department of Building Services Engineering, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
3 State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China




Numerical investigations of the transport and distribution of airborne particles in a test chamber were carried out with drift-flux model. Although factors such as the configuration of the flow field and gravitational settling can influence the distribution of particle concentration, the results show that the walls can play an important role in particle dispersion when the velocity gradient of air flow at the walls is high. The high gradient of the air flow velocity at the walls can lead to particle accumulation near the walls, which can significantly improve the particle concentration. The walls can also influence the particle distribution in vertical space, along with gravitational settling.



Keywords: Drift-flux model; Wall effect; Indoor airborne particle; Transport; Distribution.



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