Experimental study of dust emission: Comparison between high-temperature and ambient-temperature materials

Wang, Yi; Duan, Mengjie; Ren, Xinrong; Qu, Xinrui; Cao, Yingxue; Yang, Yang; Fan, Hang; Chu, Zongkun

doi:10.1016/j.powtec.2016.08.014

Cited by 15 publications

(3 citation statements)

References 21 publications

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“…Due to the mutual coupling between the hot airflow and the particles, these hightemperature particles often show different diffusion characteristics in comparison to normal temperature particles. 3,4 Studies have shown particle agglomerates produced by hot working processes typically range in size from 0.05 μm to 20 μm. 5 Amongst them, particles with a size smaller than pollutants, and has important guiding significance for ensuring the health of operators and reducing damage to the environment.…”

Section: Introductionmentioning

confidence: 99%

A numerical research on transient transport of high-temperature particles associated with air gouging process

Han,

Zhuang,

Zhang

et al. 2024

Indoor and Built Environment

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The high-temperature particles produced by air gouging processes are common pollutants in cleaning workshops, which could endanger workers’ health. In this research, a two-way coupled Eulerian-Lagrangian method based on discrete phase modelling (DPM) was used to investigate the transport characteristics of high-temperature particles generated from air gouging processes. The particle group in the movement was divided into core zone and boundary zone, and the kinetic mechanism of particles in different zones was analysed. The results show particles in the boundary zone are more susceptible to the vortex entrainment effect than particles in the core zone, and some particles could be moved from the vortex diffusion zone to the vortex recirculation zone. The smaller the particle size, the better the followability to the hot airflow. The slower the temperature decay of particles, the more significant the thermophoresis effect, which could enhance the diffusion behaviour of the small particles. By analysing the average residence time of particles in the breathing zone, the influence of different factors on the average vertical diffusion height [Formula: see text] of particles is summarized, and a nonlinear regression prediction model of [Formula: see text] is established. The results can contribute to health risk assessment and industrial ventilation design.

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Section: Introductionmentioning

confidence: 99%

A numerical research on transient transport of high-temperature particles associated with air gouging process

Han,

Zhuang,

Zhang

et al. 2024

Indoor and Built Environment

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“…Ullmann et al , thoroughly studied the dust emission from belt conveyor transfer points and reviewed, compared and analyzed different calculation formulas and current design methods. Wang et al , conducted an experimental study on the characteristics and dust generation rate of materials at different temperatures in the process of free falling, which showed that the first fugitive dust rate increased with the temperature increased. Wangchai et al studied the experimental material flow and the subsequent discrete element method simulation in the rotating drum of two dustiness testers …”

Section: Introductionmentioning

confidence: 99%

Research on the Influencing Factors and Prediction Model of Impact Airflow in the Process of Unloading of an Ore Pass Based on a Coupled Computational Fluid Dynamics and Discrete Element Method

Wang

2021

ACS Omega

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In this paper, a coupled computational fluid dynamics and discrete element method (CFD-DEM) is used to numerically simulate the energy transfer of the ore falling process and the change law of impact airflow velocity under different influencing factors. The results are as follows: the total drag force is an important factor that determines the impact airflow velocity. The greater the total drag force, the greater the impact airflow velocity. The impact airflow velocity increases with the increase of mass flow rate and discharge height and decreases with the increase of ore size, and it is found that the discharge height has the greatest impact on the impact airflow velocity, the ore size is the second, and the mass flow rate is the smallest. Therefore, in the allowable range of mine production, the discharge height should be appropriately reduced. The mathematical model of the impact airflow velocity is obtained by multivariate nonlinear regression on the experimental results of orthogonal experiments.

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“…In the literature, many experimental studies on the discharge of a silo were conducted. Some of these were dedicated to the characterization of the granular flow inside the silo [3][4][5] and others on the quantification and understanding of the mechanisms responsible of the granular jet spreading [6][7][8][9][10][11]. These studies showed that the flow rate of induced air into the stream is one of the key to the granular jet expansion.…”

Section: Introductionmentioning

confidence: 99%

Eulerian modelling of the powder discharge of a silo: Attempting to shed some light on the origin of jet expansion

Audard

Fede

Belut³

et al. 2021

Powder Technology

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Powder discharging from a silo provokes an emission of dust. To understand and prevent this source of danger, 3D simulations of a silo discharge were performed using an Euler-Euler approach. The impact of the coupling between the flow inside the silo and the granular jet in free-fall is analyzed. Results show that the solid mass flow rate is correctly predicted and that gas back-flowing at the hopper exhaust appears responsible for the formation of a fluctuating and radially expanding jet. However, the radial expansion of the free-falling jet is underestimated. Stochastic fluctuations of the particles velocity at the hopper exhaust are introduced to evaluate their effect on the downstream development of the free-falling jet. These fluctuations are found capable of generating a development of the jet similar to that observed experimentally. This suggests that the granular flow conditions at the hopper exhaust are responsible for the further dispersion of powder.

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Experimental study of dust emission: Comparison between high-temperature and ambient-temperature materials

Cited by 15 publications

References 21 publications

A numerical research on transient transport of high-temperature particles associated with air gouging process

A numerical research on transient transport of high-temperature particles associated with air gouging process

Research on the Influencing Factors and Prediction Model of Impact Airflow in the Process of Unloading of an Ore Pass Based on a Coupled Computational Fluid Dynamics and Discrete Element Method

Eulerian modelling of the powder discharge of a silo: Attempting to shed some light on the origin of jet expansion

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