CFD-DEM coupled study on the characteristics of entrained air and particles dispersion during the particles flow impacting on a heap surface process

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-03-17 DOI:10.1016/j.powtec.2025.120940

Hongfa Sun , Siliang Zhou , Jibo Long , Li Zeng

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Abstract

The process of loading and unloading bulk materials is common in industrial production. This process has become a major source of dust fugitive in industrial plants. In order to understand its dust production mechanism, this paper establishes a physical model of particles flow impacting on the material heap. The CFD-DEM coupling method is validated using experimental data. The effects of heap angle, particle velocity, and hopper outlet diameter on the characteristics of entrained airflow and particle motion are analyzed. The index of ‘entrained flux’ is proposed to assess the influence range of entrained air at the material heap tail. The results indicate that the entrained air velocity exhibits a Gaussian distribution along the normal direction of the material heap surface, with significant fluctuations at the upper part of the material heap and the formation of vortex motion at the material heap tail. The magnitude of the entrained flux is primarily influenced by the location of the vortex, which gradually moves away from the material heap as particle velocity and hopper outlet diameter increase. Conversely, as the heap angle increases, the vortex movement tends to approach the material heap. An objective weighting method is used to analyze the influence weights of the entrained flux, revealing that particle velocity has the highest weight of 39 %, while the hopper outlet diameter has the lowest weight of 26 %.

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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.