Particle resuspension in indoor environment
The increasing concern of the effects of particle exposure on human health has increased the attention on particle deposition and resuspension in an indoor environment. High concentrations of particulate matter less than 2.5µm in size or PM2.5 is labelled as a health hazard. Bio-organisms such as ba...
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sg-ntu-dr.10356-533182023-03-04T18:18:23Z Particle resuspension in indoor environment Yong, Cheng Hong. Zhang Hui School of Mechanical and Aerospace Engineering Wan, Man Pun DRNTU::Engineering::Mechanical engineering::Fluid mechanics The increasing concern of the effects of particle exposure on human health has increased the attention on particle deposition and resuspension in an indoor environment. High concentrations of particulate matter less than 2.5µm in size or PM2.5 is labelled as a health hazard. Bio-organisms such as bacteria, allergens, mites and spores fall within the size of 1-10µm. Resuspension of material By understanding the behaviour of particles in this size range, methods of mitigation can be devised. Two mathematical models are proposed estimate the airborne number concentration of the particles for deposition and resuspension. The deposition model allows the airborne number concentration at time, t to be estimated. The resuspension model allows an estimation of the airborne number concentration of the particles at time, t when a few parameters such as deposition velocity and resuspension rates are known. The behaviour of particles between 1-10µm in a turbulent indoor environment is also investigated in this project. The effect of the electrostatic force of attraction on particles is generally ignored in many experiments. However, it is observed to have a significant impact in the experiments on particles, especially those less than 5µm. After the anti-static spray is applied to the surface, decay constant for deposition with the fan on is observed to be reduced by up to 49.9%. The decay constant and deposition velocities are found to be higher when the fan is on as opposed to pure deposition. Bachelor of Engineering (Mechanical Engineering) 2013-05-31T05:01:15Z 2013-05-31T05:01:15Z 2013 2013 Final Year Project (FYP) http://hdl.handle.net/10356/53318 en Nanyang Technological University 93 p. application/pdf |
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DRNTU::Engineering::Mechanical engineering::Fluid mechanics Yong, Cheng Hong. Particle resuspension in indoor environment |
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The increasing concern of the effects of particle exposure on human health has increased the attention on particle deposition and resuspension in an indoor environment. High concentrations of particulate matter less than 2.5µm in size or PM2.5 is labelled as a health hazard. Bio-organisms such as bacteria, allergens, mites and spores fall within the size of 1-10µm. Resuspension of material By understanding the behaviour of particles in this size range, methods of mitigation can be devised. Two mathematical models are proposed estimate the airborne number concentration of the particles for deposition and resuspension. The deposition model allows the airborne number concentration at time, t to be estimated. The resuspension model allows an estimation of the airborne number concentration of the particles at time, t when a few parameters such as deposition velocity and resuspension rates are known. The behaviour of particles between 1-10µm in a turbulent indoor environment is also investigated in this project. The effect of the electrostatic force of attraction on particles is generally ignored in many experiments. However, it is observed to have a significant impact in the experiments on particles, especially those less than 5µm. After the anti-static spray is applied to the surface, decay constant for deposition with the fan on is observed to be reduced by up to 49.9%. The decay constant and deposition velocities are found to be higher when the fan is on as opposed to pure deposition. |
author2 |
Zhang Hui |
author_facet |
Zhang Hui Yong, Cheng Hong. |
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Final Year Project |
author |
Yong, Cheng Hong. |
author_sort |
Yong, Cheng Hong. |
title |
Particle resuspension in indoor environment |
title_short |
Particle resuspension in indoor environment |
title_full |
Particle resuspension in indoor environment |
title_fullStr |
Particle resuspension in indoor environment |
title_full_unstemmed |
Particle resuspension in indoor environment |
title_sort |
particle resuspension in indoor environment |
publishDate |
2013 |
url |
http://hdl.handle.net/10356/53318 |
_version_ |
1759856990109040640 |