Numerical study on deposition of bioaerosols under different ventilation systems

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Numerical study on deposition of bioaerosols under different ventilation systems

 

Author: Ching, Chin Hung
Title: Numerical study on deposition of bioaerosols under different ventilation systems
Degree: M.Eng.
Year: 2015
Subject: Ventilation -- Mathematical models.
Air -- Microbiology.
Fluid dynamics -- Computer simulation.
Indoor air quality.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Building Services Engineering
Pages: xii, 137 pages : illustrations (some color)
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2826141
URI: http://theses.lib.polyu.edu.hk/handle/200/8232
Abstract: Everyday we come across a whole lot of microbial infection, some of which take the form of disease. On our dearest land, a quarter of the total airborne is composed different types of biological particles like pollen, fungal spores, bacterial organisms, viroids and viral micro-bodies, or pieces of plant and animal matter. Ventilation systems are the worst and major reservoir for bioaerosols dispersion in highly populated areas like Hong Kong and other more populated countries in the world, understanding the distribution and deposition of bioaerosols from the ventilation systems of buildings is therefore important.Displaced ventilation with upward system can be used as a basic system to conduct the experiment and collect the data of bioaerosols in this research. Main method used includes bioaerosols transport model and Eulerian-Lagrangian approach. We will use the same method to perform experiments with different ventilation systems and compare the results. Approach of computational fluid dynamics or (CFD - Ansys Fluid 14.0) has been applied for simulation of bioaerosols deposition to compare with the experiment results and find out whether the bioaerosols of air using CFD program is close to the reality state. Some of the influencing factors such as indoor airflow velocity, ventilation system model, bioaerosols diameter etc. synthetically in our paper will be considered. As a result, we would like to find out the distribution pattern of different indoor bioaerosols.This topic has been chosen in order to find out a suitable method of identifying the airborne particles which are composed of different biological elements like microbes, fungus etc.The gap between this study and other studies is in the approach of obtaining the avantgarde method of discriminating the airborne biological particles. The avantgarde are methods of works or discrimination that are very innovative and experimental especially with regard to airborne biological particles such as virus. Avantgarde pushes the harmful airborne biological particles primarily within the cultural realm. In this study, simulation approaches like computational fluid dynamics or in brief CFD are applied gradually for modeling the behavior of particles in indoor air and the outcomes inferred reflect the risk from infection. In most of the literatures, the approach of this method is in question, nevertheless we would base on the capacity of CFD simulations to evaluate the spatial distributions of the bioaerosol deposition in indoor atmospheres and discover the influences of chamber test have on the deposition patterns.

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