On the analysis of a coarse particle free falling material stream

Esmaili, A. A.; Donohue, Timothy J.; Wheeler, Craig; McBride, William M.; Roberts, A. W.

doi:10.1016/j.minpro.2015.02.013

Cited by 21 publications

(4 citation statements)

References 12 publications

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“…Uchiyama conducted numerical simulation on the particle jet problem caused by solid particles falling into quiescent air from a slit orifice. Ansart et al have improved the Cooper experiments based on measuring entrained air, and they studied the airflow velocity distributions of falling powder by means of a particle image velocimetry system, and the results showed that the intensity and the vertical velocity fitted a Gaussian curve. , Esmaili et al studied the interaction between particles and air in free-falling of bulk materials through a series of computer simulations and experiments and measured the fluid velocity in the falling process of coarse materials using a particle image velocimetry technique, and the result of experiments was in good overall agreement with simulation results. Duan et al analyzed the correlation between the three factors of falling height, hopper outlet diameter and temperature of materials, and the dust generation rate of free-falling materials, and the research showed that the height of falling materials and the temperature had a great influence on the first fugitive dust rate, whereas the second fugitive dust rate is mainly decided by the hopper outlet diameter.…”

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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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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“…To address the dust pollution problem of belt conveyor transfer stations, the mechanism of unpowered dust suppression and the main points of design and application have been proposed, laying a foundation for studying the formation mechanism of dust suppression flow fields [7][8][9]. Fugitive dust is closely related to the wind induced by the falling of bulk materials [10], which then reacts with the falling bulk materials, forming an open space fugitive dust flow field. Scholars worldwide mostly study the diffusion characteristics of particle flow and the collision mechanism between particles and between particles and walls [11,12].…”

Section: Introductionmentioning

confidence: 99%

Flow Field Characteristics of Fugitive Dust from Grab Unloading in an Open Space

Zhang,

Meng,

Zhang

et al. 2023

Processes

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Aiming at addressing the problem of dust generated when grab is unloaded, the flow field characteristics of fugitive dust in an open space were studied and reflected its unstable and complex nonlinear dynamic process. Using coal, sand, and flour as research objects, an experimental model and measurement system for grab unloading were built, and the dust diffusion range, diffusion speed and direction, settling time, dust concentration, and induced wind velocity at different measurement points were compared. The computational fluid dynamics–discrete element method (CFD-DEM) coupling method was adopted, the discrete phase model (DPM) of dust was established, the interaction of the particle, dust, and airflow fields during the unloading process of the grab was further studied, and the distribution and diffusion laws of the induced airflow and dust were obtained. The acquisition of flow field characteristics is of great significance for controlling and guiding the orderly deposition of dust.

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“…Ansart [11,12] established a new calculation formula in order to avoid the influence of empirical parameters on the entrained air volume in the particles flow fall process. Esmail [13,14] analyzed the characteristics of the entrained air flow field caused by the particles flow fall process based on the law of volume conservation, and found that the entrained air volume can be obtained by using the cone volume formed by the particles flow fall process over time. Li [15,16] used the π theory to analyze the factors affecting the entrained air velocity at the transfer point, and obtained the empirical formula for entrained air velocity, and then used the entrained air velocity and the diffusion area to obtain formula of entrained air volume.…”

Section: Introductionmentioning

confidence: 99%

Research on the Dust Suppression Effect of Three Types of Baffles on the Particle Flow Horizontal Projectile Falling Process in Transverse Airflow

Sun

Long

et al. 2022

E3S Web Conf.

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Industrial progress is the source of social development. As one of the important links in the industrial production process, industrial particulate transportation systems such as coal, cement, mineral materials and food transportation cause a large number of dust diffuse problems, which have become the pollution source of the deterioration of the environment quality in the workplace. In the production process, the initial velocity of the conveyor belt makes the particle flow form a horizontal projectile motion, which causes the dust pollution and transverse airflow often further aggravates the dust diffusion. Firstly, the author verified the applicability of Discrete Phase Model by using experimental result. Then, this paper studies the control effect of dust emission in the particles flow horizontal projectile fall process with different types baffle and different baffle positions under transverse airflow. The results show that the semicircular baffle has a better dust suppression effect, followed by the V-shaped baffle, the straight baffle is the worst. The semicircular and V-shaped baffles are moved closer to the particles source out, the better the dust suppression effect. The dust suppression effect of the straight baffle gradually improves as the distance increases, and reaches the best at a distance of L=1 m. The research results provide a theoretical basis for ventilation dust removal design of industrial particulate transport systems.

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On the analysis of a coarse particle free falling material stream

Cited by 21 publications

References 12 publications

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

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

Flow Field Characteristics of Fugitive Dust from Grab Unloading in an Open Space

Research on the Dust Suppression Effect of Three Types of Baffles on the Particle Flow Horizontal Projectile Falling Process in Transverse Airflow

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