The influence of air flow on maximum explosion characteristics of dust–air mixtures

Serafín, Jiří; Bebčák, Aleš; Bernatík, Aleš; Lepík, Petr; Mynarz, Miroslav; Pitt, Martin J.

doi:10.1016/j.jlp.2012.11.002

Cited by 34 publications

(9 citation statements)

References 8 publications

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“…where ρ is the air density, t is time, v → is the air velocity vector, p is the static pressure, μ is the molecular viscosity, I is the dynamic tensor, ρ g → and F → are the gravitational and external body force k T is the coefficient of heat transfer, C p is the specific heat capacity, and s T is the viscous dissipation energy. e air in the roadway is a typical turbulent flow, and the most widely used standard k-epsilon turbulence model was adopted to simulate the flow behaviour [18,19]. e turbulence kinetic energy, k and its rate of dissipation, ε, can be obtained from the following equations [20]:…”

Section: E Model Of Airflow Fieldmentioning

confidence: 99%

The Influence of Ventilation Arrangement on the Mechanism of Dust Distribution in Woxi Pithead

Zhou

et al. 2018

Shock and Vibration

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Suppressing and removing mine dust from the working face is an important task for underground mines worldwide. In this paper, a numerical study was carried out to investigate the influence of ventilation arrangement on the mechanism of dust distribution. The Woxi Pithead of Hunan Chenzhou Mining Co., Ltd, China, was used as a case study, which adopted a widely used far-pressing-near-absorption (FPNA) ventilation system. Based on the theory of gas-solid two-phase flow, the program ANSYS Fluent was utilized, and the three-dimensional airflow migration and dust diffusion numerical models were simulated. The established computational fluid dynamics (CFD) models were validated using the airflow velocity data and the dust concentration data monitored at different positions from the operating coal mine. A comprehensive sensitivity study was conducted to investigate the influence of four parameters on dust suppression, including the distance of pressure air duct outlet from working face (Lp-outlet), the distance of exhaust air duct inlet from working face (Le-inlet), the ratio of pressing air volume to lab sorption air volume (K), and the installation height of the air duct (H). The optimum ventilation layout parameters were obtained through the simulation of the wind field and dust behaviour. The results show that there were four regions during the airflow field, namely, the jet zone, the recirculation zone, the vortex zone, and the mixing zone of pressure and exhaust airflow. All four parameters were found to have an important influence on the mass concentration of dust, and the optimum ventilation layout parameters were determined to be Lp-outlet = 18 m, Le-inlet = 3 m, K = 1.2, and H = 1.6 m.

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Section: E Model Of Airflow Fieldmentioning

confidence: 99%

The Influence of Ventilation Arrangement on the Mechanism of Dust Distribution in Woxi Pithead

Zhou

et al. 2018

Shock and Vibration

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“…On a fully mechanized working face, the two-phase flow field of the gas-phase airflow and solid-phase airflow was often for a turbulent state, and the time-averaged equations of the two-phase flow field pre-and post-formation of multi-direction whirling air curtain are as follows [11][12][13]:…”

Section: Mathematical Modelmentioning

confidence: 99%

Effect of suppressing dust by multi-direction whirling air curtain on fully mechanized mining face

Nie

Liu

Wei

et al. 2016

International Journal of Mining Science and Technology

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“…However, in contrast to turbulence during flame propagation, the initial turbulence has only seen limited studies in the literature with regard to its impact on the explosion of fuel‐air mixtures. Among those reported, the majority are focused on dust or gas/dust mixtures 19–22. Only a few reports are concerned with gas‐air mixtures and they are reviewed as follows.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of the Impact of Initial Turbulence on the Explosion Behavior of Methane‐Air Mixtures

Chen

2021

Chem Eng & Technol

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The experimental parameters that significantly affect the gas explosion process were determined, investigating the pressure, temperature, and velocity in the methane‐air explosion process under quiescent and turbulent conditions. Experiments and computational fluid dynamics simulations were integrated to optimize the experimental parameters and elucidate the impact of the initial turbulence on the explosion behavior of methane‐air mixtures. Good agreement was achieved between the computed results and experimental data. For a certain CH4 concentration within the explosive limit range, an initial turbulence can increase the maximum explosion pressure and the maximum rate of the pressure rise, shorten the time to reach the maximum explosion pressure and enhance the explosion strength and destructive power of CH4‐air mixtures. Turbulent flow can significantly broaden the explosive limits of CH4‐air mixtures. The ignition delay time affects the distribution of the initial turbulence and thus the extent and severity of the explosions.

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The influence of air flow on maximum explosion characteristics of dust–air mixtures

Cited by 34 publications

References 8 publications

The Influence of Ventilation Arrangement on the Mechanism of Dust Distribution in Woxi Pithead

The Influence of Ventilation Arrangement on the Mechanism of Dust Distribution in Woxi Pithead

Effect of suppressing dust by multi-direction whirling air curtain on fully mechanized mining face

Experimental and Numerical Study of the Impact of Initial Turbulence on the Explosion Behavior of Methane‐Air Mixtures

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