THESIS
2019
xviii, 146 pages : illustrations (some color) ; 30 cm
Abstract
Resuspension is a process where deposited particles become airborne through
entraining and then suspending in air. The high particle concentration can have adverse effect
on health such as respiratory disease. Understanding the resuspension process can benefit the
mitigation of particle concentration. In addition, the resuspension process can be found in many
industrial applications. In this study, resuspension of solid particle and liquid droplet from a
dusty surface is investigated, this is because dust is ubiquitous in our daily lives and it favors
the resuspension process. To understand the resuspension from dusty surfaces, it is essential to
study the properties of surface dust. The characterization of the dust deposit for different dust
loadings and particle sizes were fi...[
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Resuspension is a process where deposited particles become airborne through
entraining and then suspending in air. The high particle concentration can have adverse effect
on health such as respiratory disease. Understanding the resuspension process can benefit the
mitigation of particle concentration. In addition, the resuspension process can be found in many
industrial applications. In this study, resuspension of solid particle and liquid droplet from a
dusty surface is investigated, this is because dust is ubiquitous in our daily lives and it favors
the resuspension process. To understand the resuspension from dusty surfaces, it is essential to
study the properties of surface dust. The characterization of the dust deposit for different dust
loadings and particle sizes were first investigated. The mean and root-mean-square of the
surface roughness were the characteristics of the dust deposit and the mean of the surface
roughness was used to determine the type of deposit, such as monolayer, intermediate, and
multilayer. After the classification of the deposit type, the solid particle resuspension from the
dusty surface in a wind tunnel was studied. First, for a 2 g/m
2 dust loading surface, the dust
particles resuspended significantly with increasing friction velocity compared to other dust
loadings. With respect to particle resuspension, the remaining fraction decreased substantially
with increasing dust loading. A log-normal adhesion force was utilized to analyse the
experimental result. The detachment of glycerol droplet with different dust loadings was also
investigated experimentally in the wind tunnel. It was found that the critical friction velocity
of 0 g/m
2 dust loading was greater than the critical friction velocity of the surfaces with dust particles. The dust particles enable the resuspension process takes place more easily.
Understanding the resuspension process can help to reduce indoor aerosol concentration and
enhance the performance of industrial applications.
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