Investigation into the transport, behaviour and deposition of combustion aerosols from transport sources

Burchill, Michael (2011) Investigation into the transport, behaviour and deposition of combustion aerosols from transport sources. PhD thesis, Queensland University of Technology.

Abstract

The deterioration of air quality is a significant issue in large and growing cities. This work investigates particulate emissions from transport, the largest source of air pollution in cities today. Emitters such as busy roads and diesel trains are investigated, with specific reference to the evolution of particles over time and distance. Diesel trains are investigated as an alternative to road traffic in investigating evolutionary processes. Higher emissions and solitary sources mean that the emitted plume can be observed over time in a single location. These results represent the first investigation of the evolution of fine and ultrafine aerosol particles from this type of source. Aerosols near a busy road are investigated, with the result that a dependence of total number concentration on distance from the road is shown to be related to the fragmentation of nanoparticle clusters. Local meteorological conditions are also monitored and humidity is shown to vary with distance from the road in a nonmonotonic way. Particles from a busy road were also examined using a scanning electron microscope, with the intention of understanding the make up of the emitted aerosol plume. It was determined that due to significant surface behaviour post-deposition, this method of analysis could not directly classify airborne pollutants. Some interesting results were obtained however, particularly in terms of composite particles and the analysis of deposited patterns. This thesis introduces new work in terms of the analysis of diesel train particulate emissions, as well as adding further evidence towards the fragmentation process of aerosol evolution in both background concentrations and emitted aerosol plumes.

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129 since deposited on 27 Mar 2012
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ID Code: 49383
Item Type: QUT Thesis (PhD)
Supervisor: Jaatinen, Esa & Bostrom, Thor
Keywords: combustion aerosols, particle evolution, total number concentration, diesel trains, fragmentation, condensation, humidity, micrometeorology, deposition, surface diffusion
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Institution: Queensland University of Technology
Deposited On: 27 Mar 2012 06:34
Last Modified: 27 Mar 2012 06:34

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