Numerical Simulation Study on Spatial Diffusion Behavior of Non-Point Source Fugitive Dust under Different Enclosure...

Area of Science:

• Environmental Engineering
• Air Pollution Control
• Computational Fluid Dynamics

Background:

• Fugitive dust from municipal road construction poses significant health risks to workers and residents.
• Ambient air pollution from construction sites is a major environmental concern.

Purpose of the Study:

• To analyze the diffusion behavior of fugitive dust under various enclosure heights using a computational model.
• To evaluate the effectiveness of enclosures in mitigating dust spread to residential areas.

Main Methods:

• Utilized a gas-solid two-phase flow model to simulate dust diffusion dynamics.
• Analyzed the impact of different enclosure heights and wind loads on dust dispersion.
• Quantified particulate matter concentration reduction in simulated residential zones.

Main Results:

• Enclosures demonstrate significant physical blocking and reflux effects, effectively restraining dust diffusion.
• An enclosure height of 3-3.5m reduced particulate matter concentration below 40 μg/m³ in most residential areas.
• Dust particle diffusion height above enclosures (2-3.5m) was concentrated between 1.5-2m at wind speeds of 1-5 m/s.

Conclusions:

• Enclosures are a scientifically validated method for controlling construction dust.
• Provides data-driven recommendations for optimal enclosure and sprinkler heights to minimize air pollution impacts.
• Offers strategies to improve air quality in residential areas adjacent to construction sites and safeguard public health.