A CFD Lagrangian particle model to analyze the dust dispersion problem in quarries blasts

Álvarez, J. Toraño; Álvarez, Ignacio; Lougedo, S. T.; Hevia, B. G.

doi:10.2495/mpf070021

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…The particle transport was calculated using the discrete phase model (DPM). This study used the Lagrangian discrete particle model for particle tracking, as used in many studies [20]- [22]. The problem was initially solved as a single-phase flow, and DPM was enabled.…”

Section: Methodsmentioning

confidence: 99%

The impacts of surface roughness on Indoor aerodynamics of virus-laden particles: The case of contact, deposition, and resuspension

Alhaji

2023

E3S Web of Conf.

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The increasing prevalence and high morbidity of the SARS-CoV-2 virus during the COVID-19 pandemic drew widespread global attention. Surface contact is among the most common ways for the infection to spread within people, especially in buildings and the built environment. The roughness characteristics of finishing materials used in buildings vary, affecting the surface's ability to deposit and resuspend any particles that come into contact with these interfaces. Resuspension of particles indoors may increase the risk of consequent exposure through inhalation. However, little is known about surface roughness characteristics' role in airborne transmission of virus-laden particles in building indoor environments. The study examines the impact of surface roughness characteristics on the airborne transmission of the SARS-CoV-2 virus, considering indoor aerodynamic forces and their influence on particle contact with surfaces, deposition, and resuspension. The study applies Ansys Fluent CFD simulation tools to investigate the effect of volumetric flow rates and air velocity on concentration, deposition, and resuspension. The study also employs an empirical model to estimate surface roughness characteristics' impacts on particle resuspension rate. The results indicate that particle concentration and deposition rates indoors increase with increasing volumetric airflow rates. The particle resuspension rates also decreased with the increasing surface roughness of indoor surface materials. The highest resuspension rate recorded was 3.3 x 10-6, and the lowest was 1.6 x 10-6 s-1. Therefore, the outcome provides information on the implications of surface material selection and its effects on indoor air quality, health, and virus transmission. The study will offer valuable information for building engineering and design professionals in combating airborne disease transmission due to indoor surface characteristics.

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Section: Methodsmentioning

confidence: 99%

The impacts of surface roughness on Indoor aerodynamics of virus-laden particles: The case of contact, deposition, and resuspension

Alhaji

2023

E3S Web of Conf.

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“…where A is the area below the PM10 concentration-time curve obtained by the dust collectors, V is the wind velocity in m/s and 12 is the number of disturbances per year, [8][9][10][11]22,23].…”

Section: Dust Behaviour Modellingmentioning

confidence: 99%

“…In addition, the CFD models have produced satisfactory results in the dust cloud dispersion in blasting, in open mineral storage piles, in vessel loading and unloading port systems and in preventive measures analysis against dust such as the use of barriers [7][8][9]. That is why the authors decided to apply CFD to the study of air pollution in landfill sites and to include the new LIDAR technique to this software.…”

mentioning

confidence: 90%

Prediction of particulate air pollution from a landfill site using CFD and LIDAR techniques

et al. 2010

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Landfill sites have been the most common way of eliminating solid urban waste, as well as that of public and mining wastes. Landfill sites are a constant source of environmental pollution and wind is the most important contributing factor to air pollution, due to the erosion which it produces over the landfill site surfaces, transporting dust away from the source point. This causes serious risks for human health and general dirt in the surrounding areas of the landfill site. The result of dust air pollution produced in a landfill site is analysed through CFD3D (Computational Fluid Dynamics) by joining the LIDAR (Light Detection and Ranging) technique and Ansys CFX 10.0 software. The CFD simulations determine the wind velocity distribution on the landfill site surface and the different particle threshold friction velocities which determine the dust emission in multiphase simulations (air-particles). These simulations are validated from field data obtained in three measurement programmes for each type of landfill site surface treatment which has been studied. It was determined that the superficial landfill site treatment with the lowest air pollution is tall grass and bushes. The methodology used can be applied to the dust emission calculation in the design or evaluation of other landfill sites.

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Dust barriers in open pit blasts. Multiphase Computational Fluid Dynamics (CFD) simulations

Álvarez

Lougedo

2008

WIT Transactions on Ecology and the Environment

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In the framework of the Research Project CTM2005-00187/TECNO, "Prediction models and prevention systems in the particle atmospheric contamination in an industrial environment" of the Spanish National R+D Plan of the Ministry of Education and Science, 2004-2007 period, there has been developed a CFD model to simulate the dispersion of the dust generated in blasts located in limestone quarries. The possible environmental impacts created by an open pit blast are ground vibrations, air shock waves, flying rocks and dust dispersion, being this last effect the less studied one. This is a complex phenomenon that was studied in previous successful researches through the use of several digital video recordings of blasts and the dust concentration field data measured by light scattering instruments, as well as the subsequent simulation of the dust clouds dispersion using Multiphase Computational Fluid Dynamics (CFD). CFD calculations where done using state of the art commercial software, Ansys CFX 10.0, through transitory models simultaneously using 7 different dust sizes with Lagrangian particle models crossing an Eulerian air continuous phase. This paper presents results and observations obtained through repeated simulations that virtually install physical barriers in the vicinity of the blast with the aim of diminishing the dust cloud dispersion ant the associated environmental impact. There have been tested several combinations of low and high barriers installed 100 or 200 m apart from the blasting area. Assuming full trapping of the dust in the solid barrier there are scenarios where dust retention in the model could be as high as 90%, which shows the potential use of barriers to avoid dust dispersion. Models also show the barriers shadow effect in the dust deposition area, useful for the definition of protection areas where sensible equipment or installation could be located.

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A CFD Lagrangian particle model to analyze the dust dispersion problem in quarries blasts

Cited by 3 publications

References 5 publications

The impacts of surface roughness on Indoor aerodynamics of virus-laden particles: The case of contact, deposition, and resuspension

The impacts of surface roughness on Indoor aerodynamics of virus-laden particles: The case of contact, deposition, and resuspension

Prediction of particulate air pollution from a landfill site using CFD and LIDAR techniques

Dust barriers in open pit blasts. Multiphase Computational Fluid Dynamics (CFD) simulations

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