Meso-scale numerical analysis of the role of Van der Waals adhesion and static friction in fluidized beds of fine solids

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-02-15 DOI:10.1016/j.powtec.2025.120763

Youssef Badran , Dorian Dupuy , Bruno Blais , Vincent Moureau , Renaud Ansart , Jamal Chaouki , Olivier Simonin

引用次数: 0

Abstract

This article explores the effect of Van der Waals force and static friction on the fluidization of fine solids using CFD-DEM simulations. The results show that both Van der Waals adhesion and static friction contribute to the pressure-drop hysteresis phenomenon. These results also demonstrate that to predict the homogeneous expansion of the bed across the range of velocities from the minimum required for fluidization to the minimum for bubbling, it is necessary to take into account the Van der Waals adhesion. The generated CFD-DEM dataset can guide the development of solid stress closures for two-fluid models to incorporate the effects of Van der Waals adhesion and static friction on fluidization hydrodynamics, allowing for the prediction of hysteresis in bed pressure drop at the macro-scale.

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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.