A numerical study on dispersion and deposition of bioaerosols in a classroom

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A numerical study on dispersion and deposition of bioaerosols in a classroom

 

Author: Nie, Xingxin
Title: A numerical study on dispersion and deposition of bioaerosols in a classroom
Degree: M.Eng.
Year: 2016
Subject: Indoor air quality.
Air -- Microbiology.
Indoor air pollution.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Building Services Engineering
Pages: x, 76 pages : color illustrations
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2917167
URI: http://theses.lib.polyu.edu.hk/handle/200/8673
Abstract: With the highly development of society, there is an increasing concerning about indoor air quality (IAQ), not only thermal comfort, but also sanitation, health and some other factors that may affect occupants feeling indoors. Among them above, as one of the most important contaminants, bioaerosols (abbreviation of biological aerosols), have drawn more and more research attentions to investigate on distribution and transport of indoor bioaerosols, because of their potential health effects and the various illness caused by them. In most studies, with the difficulties and dangers in emitting bioaerosols directly for actual measurement and research, simulation approaches such as computational fluid dynamics (CFD) are increasingly used to model particle behavior in indoor air. Better and better understanding of aerosol dynamics has been achieved, which has made a great attribution on many scientific and engineering applications. However, because of the differences of local climate and simulation site, the achievement can not be applied in all scenarios. So the existing outcomes are far away from sufficiency. This study, taking a classroom in PolyU as example, considers the ability of CFD simulation to accurately simulate spatial distributions of bioaerosols in indoor environment and explores the influence that different ventilation patterns and emission schemes of bioaerosls have on the distribution. Before the simulation, a real classroom measurement of air flow rate in POLYU is conducted to verify the reliability of the CFD simulation. In the simulation, the commercial CFD code Fluent is used, and the indoor two-phase problem is resolved by the Eulerain-Lagrangian approach, by which the air flow is modeled in a Eulerian framework, while the bioaerosols are traced individually. The airflow in the classroom is assumed to be under a well-mixed condition, although the limitation of this assumption is well-known, for the low speed situation, the well-mixed condition is sufficient accurate. The indoor ventilation rate and emission schemes of bioaerosols are demonstrated to have effects on the spatial distribution and exposure risk, which can contribute to further research and application.

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