Movement characteristics of mixed alfalfa and awnless brome seeds within a Venturi conveyor based on CFD-DEM

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-02-01 DOI:10.1016/j.powtec.2025.120735

Yangyang Liao, Xiaoyi Zhou, Yong You, Decheng Wang, Yunting Hui

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引用次数: 0

Abstract

The movement characteristics of mixed alfalfa and awnless brome seeds within a Venturi conveyor of an air-blown centralized seeding system were studied by using the CFD-DEM coupling method. A Venturi conveyor with curved tube structure was designed based on the principle of the brachistochrone curve, and the impact of various structural and working parameters on seed movement characteristics and airflow distribution was investigated. The results showed that the stability and uniformity of seed supply and transport of designed curvilinear feed tube were better than that of conventional linear tube, and the 50 mm mixed tube design significantly reduced the number of collisions between seeds and the tube wall, thereby enhancing transport performance. For a 1:1 ratio of alfalfa to awnless brome seeds, the optimal airflow velocity ranged from 24 to 28 m/s, and the suitable seed feeding rate was 1500–3000 seeds/s. When the ratio was adjusted to 1:2, the suitable airflow velocity was between 20–24 m/s, and the suitable seed feeding rate was 3000–4500 seeds/s. Bench tests confirmed that the optimized Venturi conveyor effectively improved its operational performance. The study outcomes contribute to a better understanding of the motion characteristics of mixed seeds in Venturi tubes and lay the groundwork for further device structure optimization.

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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.