Direct numerical simulation of settling hydrodynamics in system of bidisperse spherical particles

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-03-03 DOI:10.1016/j.powtec.2025.120844

Muhammad Faraz Khan, Adnan Hamid, Muhammad Nadeem, Atta Ullah

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Abstract

In this study, direct numerical simulations with an enhanced Smooth Profile Method was employed to investigate the settling dynamics of bidisperse spherical particles undergoing gravitational sedimentation. Under the influence of gravity, large particles composed of joint smaller spherical beads settle in a Newtonian fluid. The concentration ratio effect of large to small particles within Stokes regime was studied. The overall system volume fraction φ is maintained at 0.1, while the volume fraction of large particles, denoted as ϕ, is varied from 0.001 to 0.5. The simulation results reveal notable changes in the radial distribution function. The height of the first peak decreases upon increase in the of large particles concentration. Meanwhile, a second peak emerges and progressively grows in prominence. The average system sedimentation velocity of the exhibits an increasing trend with an increase in ϕ. The drag coefficient of the system decreases as ϕ increases. It is also observed that the temporal auto correlation function in axial direction intensifies as increase in ϕ.

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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.