Numerical Study of the Respiratory Aerosols Transportation in Ventilated Classroom

Abstract:

Ventilation is important for controlling the airborne transmission of infectious respiratory diseases, particularly in crowed and enclosed spaces, where exist higher risks of cross-infection. This paper studies the spatial concentration distribution and particle tracks of students talking continuously in a classroom with two air distribution methods, including mixing ventilation (MV) and displacement ventilation (DV) using CFD simulations. The classroom is occupied by 10 students with a seating arrangement of 5 rows and 2 columns. The objective of this study is to find out which ventilation mode is more effective in removing respiratory aerosols. The simulation results indicated that the displacement ventilation with the low air supply velocity magnitude and low turbulence could remove the respiratory aerosol droplets and minimize the risk of infectious effectively compared with mixing ventilation.

• Periodical: Applied Mechanics and Materials (Volumes 204-208)
• Pages: 4298-4304
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.204-208.4298
• Online since: October 2012
• Authors: Guo Hui Feng, Yi Zhang, Xin Ying Lan
• Keywords: Concentration Distribution, Displacement Ventilation, Mixing Ventilation, Particle

References

[1] Hua Qian, Yuguo Li, Nielsen P. Building and Environment. 2009, 44(8): 1651-1658.

[2] Yuguo Li, Leung G M, Tang J W. Indoor Air. 2007, 17(1): 2–18.

[3] Bin Zhao, Zhao Zhang, Xianting Li. Building and Environment. 2005, 40(8): 1032–1039.

[4] Weipeng Deng, Jinming Shen, Xiqing Tang. Building energy & environment. 2005, 24(2): 9-14. (In Chinese)

[5] Jinliang Wang, Tin-Tai Chow. Building and Environment. 2011, 46: 1993–2002.

[6] Nicas M, Nazaroff WW, Hubbard A. Journal of Occupational and Environmental Hygiene. 2005, 2(3): 143-54.