Enhancing system kinetics through size segregation in granular materials

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-01-31 DOI:10.1016/j.powtec.2025.120706

Jian Guo , Guodong Wang , Yao Li

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引用次数: 0

Abstract

The segregation process is a remarkable phenomenon in granular materials found in nature, occasionally accompanied by interlayer slippage. However, their impacts on system kinetic energy remain unclear. This study aims to quantitatively analyze the relationships between interlayer slippage, kinetic energy fluctuations, and fluidity during the segregation process of granular materials using three-dimensional Discrete Element Method simulations. The simulation parameters include size ratios (S_r: 0.5–1.0), volume ratios (V_r: 0.2–0.8), and inclination slopes (δ: 10°–30°). The results show that interlayer slippage at the top significantly reduces the degree of segregation, while slippage at the bottom has a smaller effect. A positive correlation is observed between kinetic energy and the degree of segregation, with the correlation being more pronounced on steeper slopes. Moreover, minimal vertical kinetic energy fluctuations induced by segregation significantly enhance granular fluidity, whereas interlayer slippage can reduce system kinetic energy by at least 50 %. These findings indicate that the widespread segregation process observed in long-runout landslides may promote their extreme mobility and destructive power by enhancing granular fluidity. This study may provide insights into granular system dynamics and practical guidance for landslide disaster prevention and mitigation.

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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.