A coupled CFD-DEM study of the breakup of agglomerate impacted by high-velocity air jet

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-05-24 DOI:10.1016/j.powtec.2025.121163

Zhijian Zuo, Bingwen Feng, Tian Liu, Yuan Yang, Shuguang Gong, Jianping Zhang

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引用次数: 0

Abstract

Agglomeration of granular material is a common phenomenon in industries and exploring its high-efficiency breakup method is important to prolong the service life of equipment. In this work, simulations of the breakup of agglomerates impacted by high-velocity air jet are performed based on a coupled CFD-DEM method. Brazilian test and uniaxial compression test are used to obtain the bonding parameters of agglomerate composed of iron ore particles and lime, and the breakup experiment is conducted to validate the simulation model. The impact force exerted on particles, axial velocity, and turbulent kinetic energy along the centerline of air jet, breakup diameter and depth are used to quantify the jet flow and breakup performance. It was found that the initial debonding of particles appears at the stagnation point and a jet-drilled hole is gradually formed during the breakup process. The breakup performance increases with the increase of air inlet pressure. Results obtained indicate that the optimal attack angle and standoff for the agglomerate used in this work are 75° and 15 mm, respectively.

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高速气流冲击下团聚体破碎的CFD-DEM耦合研究

颗粒物料结块是工业生产中普遍存在的现象，探索其高效破碎方法对延长设备使用寿命具有重要意义。本文基于CFD-DEM耦合方法，对高速气流冲击下团聚体破碎过程进行了数值模拟。采用巴西试验和单轴压缩试验获得了铁矿颗粒与石灰组成的团聚体的粘结参数，并进行了破碎试验对模拟模型进行了验证。用颗粒受到的冲击力、轴向速度、沿射流中心线的湍流动能、破碎直径和深度来量化射流的流量和破碎性能。研究发现，颗粒在停滞点处出现初始脱粘，在破碎过程中逐渐形成喷钻孔。破碎性能随进气压力的增大而增大。结果表明，本研究中使用的团聚体的最佳攻角为75°，距离为15 mm。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.