THESIS
2015
xii, 151, that is xiv, 151 pages : illustrations ; 30 cm
Abstract
Aerosol removal is a process demanded by industries for product recovery and
particulate matter emission control. Acoustics induced aerosol manipulation
was limited to agglomeration. The aims of this study were to extend the capability
from agglomeration to enhancing deposition. Subsequently, providing
an alternative system, which had comparative advantages over traditional
removal methods. An acoustics aerosols removal system was proposed and
studied in this thesis. The system was engineered to enhance the depositions
of aerosols as they were transported through an acoustic field in an air channel.
The augmentation was facilitated by acoustic streaming, a second order
acoustic effect previously neglected in the field of acoustic aerosol manipulation.
This phenomenon, along wi...[
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Aerosol removal is a process demanded by industries for product recovery and
particulate matter emission control. Acoustics induced aerosol manipulation
was limited to agglomeration. The aims of this study were to extend the capability
from agglomeration to enhancing deposition. Subsequently, providing
an alternative system, which had comparative advantages over traditional
removal methods. An acoustics aerosols removal system was proposed and
studied in this thesis. The system was engineered to enhance the depositions
of aerosols as they were transported through an acoustic field in an air channel.
The augmentation was facilitated by acoustic streaming, a second order
acoustic effect previously neglected in the field of acoustic aerosol manipulation.
This phenomenon, along with acoustic radiation force, were initially
affirmed by visualisation. Experimental studies were perform to validate the
effectiveness of aerosol removal by the above-mentioned mechanisms.
Aerosol depositions and agglomerations were observed by quantitatively
analysed. Experimental results concluded that input aerosol characteristics
and acoustic field patterns substantially influenced the aerosol removal efficiency
of the system. The computational approach was chosen to establish a
framework for the optimisation of the system. Its capabilities complimented
the limitations in the experiments. Simulated particle dynamics and acoustic
field patterns were analysed and new underlying governing dimensionless
parameters, near-wall vorticity magnitude and deposition cell ratios, were
identified.
This thesis reported results that validated the feasibility of the proposed
system as an alternative aerosol removal technique; it served as an essential
educational tool for future researches conducted in the acoustics-aerosol manipulation
field and prospective applications in industries.
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