CFD–DEM simulation of the pneumatic conveying of fine particles through a horizontal slit

Zhou, Fang; Hu, Shengyong; Liu, Yingke; Liu, Chun; Xia, Tongqiang

doi:10.1016/j.partic.2014.03.015

Cited by 69 publications

(31 citation statements)

References 26 publications

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“…However, this approach requires huge computation time and is rarely employed in modelling of hydrofracking. Recently several coupled DEM/CFD simulation results were described in different hydro-mechanical engineering problems [12,30,46,58,59,62,63].…”

Section: Introductionmentioning

confidence: 99%

Simulations of hydro-fracking in rock mass at meso-scale using fully coupled DEM/CFD approach

et al. 2019

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The paper deals with two-dimensional (2D) numerical modelling of hydro-fracking (hydraulic fracturing) in rocks at the meso-scale. A numerical model was developed to characterize the properties of fluid-driven fractures in rocks by combining the discrete element method (DEM) with computational fluid dynamics (CFD). The mechanical behaviour of the rock matrix was simulated with DEM and the behaviour of the fracturing fluid flow in newly developed and preexisting fractures with CFD. The changes in the void geometry in the rock matrix were taken into account. The initial 2D hydro-fracking simulation tests were carried out for a rock segment under biaxial compression with one injection slot in order to validate the numerical model. The qualitative effect of several parameters on the propagation of a hydraulic fracture was studied: initial porosity of the rock matrix, dynamic viscosity of the fracking fluid, rock strength and preexisting fracture. The characteristic features of a fractured rock mass due to a high-pressure injection of fluid were realistically modelled by the proposed coupled approach.

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Section: Introductionmentioning

confidence: 99%

Simulations of hydro-fracking in rock mass at meso-scale using fully coupled DEM/CFD approach

et al. 2019

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“…The technology and related machines attached for physical disinfection with the advantages of convenience, high efficiency and low cost, which is a key point in research around the world [4] . Many scholars have conducted researches on the development of physical disinfection for soil [5][6][7] . The combination of mechanical and electrical technologies can be carried out through high-temperature flame, high-pressure steam and burying capsule.…”

Section: Introduction mentioning

confidence: 99%

Design and experiment of spray and rotary tillage combined disinfection machine for soil

Wang

Yang

Sun

et al. 2019

International Journal of Agricultural and Biological Engineering

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A spray and rotary tillage combined disinfection machine for soil was designed to solve the serious problems of plant diseases and insect pests, and it was divided into two operations which were soil disinfection and rotary tillage. The main structure and working principle of this machine were illustrated and analyzed. The reasonable structural parameters of the key parts of this machine were optimized, such as spraying disinfection system and rotary tillage land preparation system. To optimize the working performance and obtain better operation parameters, the orthogonal experiments were carried out to analyze the influences of three factors (forward speed of driving machine, rotational speed of rotary tillage, and working pressure) on the working performance. The mixing uniformity coefficient and the variation coefficient of spraying were selected for evaluating working performance. The range analysis and variance analysis were studied based on experimental data. The results showed that, the mixing uniformity coefficient of spraying was 93.95% and the variation coefficient was 6.01% with a working speed of 3 km/h, rotational speed of 2000 r/min and working pressure of 2.0 MPa. The machine can meet the agronomic requirements of disinfection and plowing, which was designed simply, compactly and strong applicability. The results can provide a guidance and technical support for preventing the plant diseases and insect pests, developing sustainable and ecological agriculture and improving the efficiency of compound cultivation.

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“…Meanwhile, an airtight chamber is left open, so that powder particles can be delivered to this chamber by means of pneumatic conveyance, and then be forced into fractures around borehole and block them. Furthermore, the transport and deposition characteristics of powder particles in complex coal fractures were analyzed and an ideal particle-transport model was established Hu et al, 2015;Zhou et al, 2014;Zhou et al, 2011). In addition, most of the existing sealing materials can only fill up borehole space, but hardly adapt to borehole deformation and flow into fractures around borehole.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Characterisation of mechanics and flow fields around in-seam methane gas drainage borehole for preventing ventilation air leakage: A case study

Zheng

Chen

Kizil

et al. 2016

International Journal of Coal Geology

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Coal Mine Methane (CMM) drainage via adopting in-seam horizontal boreholes is an effective way to decrease ventilation cost and production delay, ensure mining safety, reduce greenhouse gas emissions and increase the supply of energy resource.Ventilation air leakage into borehole, however, occurs frequently, which decreases the methane-drainage efficiency. Despite extensive anti-leakage method investigations, a very few studies have been focused on spraying air-proof materials on the roadway rib and optimizing borehole sealing along the borehole, along with taking the effects of sequential excavations of roadway and borehole into account. In this paper, based on data of a real coal mine, a fully coupled mathematical model was developed by incorporating coal permeability with coal mechanical properties and gas adsorption/desorption and was then implemented into a Finite Element software. This numerical simulation was used to analyse transient stress and dynamic air-leakage flow fields around the drainage borehole. Simulation results indicate that: (1) Four stress areas (І to IV) exist around the roadway based on different relief status of the tri-axial stress, and stress distributions around the borehole in those four areas are different from each other; (2) Based on different air-leakage degrees, on the roadway rib, there are four air-leakage levels around borehole. Meanwhile, there are four leakage areas along the borehole: FAA, SAA, HAA and VAA, and the optimal sealing length should be over 17m (exceeding HAA) to prevent air leakage. Air-leakage results in (2) are verified mutually with the mechanics outcomes in (1). Meanwhile, real data obtained from field experiments is introduced to validate the simulation results. All those outcomes can allow for the optimal design of the spraying area and order and borehole sealing, thus provide scientific basis for an integrated anti-air-leakage method including spraying air-proof materials on the roadway wall and sealing borehole effectively, to prevent ventilation air leakage and maximize methane drainage performance.

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CFD–DEM simulation of the pneumatic conveying of fine particles through a horizontal slit

Cited by 69 publications

References 26 publications

Simulations of hydro-fracking in rock mass at meso-scale using fully coupled DEM/CFD approach

Simulations of hydro-fracking in rock mass at meso-scale using fully coupled DEM/CFD approach

Design and experiment of spray and rotary tillage combined disinfection machine for soil

Characterisation of mechanics and flow fields around in-seam methane gas drainage borehole for preventing ventilation air leakage: A case study

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