Removal dynamics of airborne road dust in a ventilated airspace
Journal
Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering
Journal Volume
37
Journal Issue
6
Pages
1009 - 1027
Date Issued
2002
Date
2002
Author(s)
Abstract
We derive a simple linear dynamic equation to describe the removal mechanisms of airborne road dust from a ventilated airspace. The dynamic equation is sufficiently to take into account the simultaneous removal effects of turbulent coagulation, turbulent diffusive deposition, gravitational sedimentation, and airflow pattern within a ventilated airspace. Three dimensionless parameters TC, TD, and GS that characterize the relative effects of turbulent coagulation, turbulent diffusive deposition and gravitational settling, respectively, in a ventilated airspace were introduced to generalize the removal dynamics of airborne road dust. An environmental chamber test was carried out not only to determine the particle size distributions but also to verify the removal dynamics of airborne road dust in a ventilated airspace. Our results demonstrate that there is no significant variation for particle size distributions of road dust obtained from urban and suburban areas in north Taiwan region and both followed a lognormal distribution with average geometric mean diameter of 1.08 ± 0.02 μm and geometric standard deviation of 2.59 ± 0.03. Measured values match the simulated values with an r2 value of 0.93, whereas the overall RMSE value of 2.36 ± 1.05 mg m-3 is low, indicating that the ability to predict the removal dynamics of airborne road dust within a ventilated airspace using an average particle size based linear equation. Effects of TC, TD, GS, and various ventilation systems on the time-dependent road dust concentrations are also justified.
Subjects
Coagulation
Deposition
Particle size distribution
Road dust
Ventilation
SDGs
Other Subjects
Coagulation; Deposition; Diffusion; Dynamics; Environmental chambers; Gravitational effects; Linear equations; Particle size analysis; Airborne road dust; Dust abatement; air pollution; air quality; article; dust; dynamics; mathematical model; particle size; sedimentation; suspended particulate matter; Taiwan; turbulent flow; waste disposal; air; air conditioning; city; exhaust gas; indoor air pollution; theoretical model; Air Movements; Air Pollution, Indoor; Cities; Dust; Models, Theoretical; Particle Size; Vehicle Emissions; Ventilation; Air Movements; Cities; Dust; Particle Size; Vehicle Emissions
Type
journal article
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