Effect of instantaneous local solid volume fraction on hydrodynamic forces in freely evolving particle suspensions

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2024-09-26 DOI:10.1016/j.powtec.2024.120312

Ze Cao , Danesh K. Tafti

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引用次数: 0

Abstract

Particle Resolved Simulations (PRS) for freely evolving sphere suspensions at solid volume fractions (

φ

) between 0.1 and 0.4, Reynolds number

(Re)

from 10 to 300 and particle-fluid density ratios

(\frac{ρ_{s}}{ρ_{f}})

of 2, 10 and 100 are used to investigate the effect of Voronoi tessellation based particle local solid volume fraction (

φ_{v})

on particle drag and lateral forces. Findings reveal the instantaneous suspension mean drag force is positively correlated with the variance of

φ_{v}

among particles in the suspension. It is also shown that using the conditioned instantaneous

φ_{v}

of each particle in existing mean drag force correlations can significantly improve the prediction accuracy. Suspension mean lateral force ranges up to 60 % of the drag force while individual particles exhibit values as high as 90 % of the drag force. An instantaneous lateral force correlation is proposed based on suspension-averaged flow variables and

φ_{v}

Abstract Image

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瞬时局部固体体积分数对自由演化颗粒悬浮液中水动力的影响

粒子解析模拟（PRS）适用于固体体积分数（φ）在 0.1 到 0.4 之间、雷诺数 Re 在 10 到 300 之间、粒子-流体密度比 ρsρf 在 2、10 和 100 之间的自由演化球形悬浮液，用于研究基于 Voronoi 网格的粒子局部固体体积分数（φv）对粒子阻力和侧向力的影响。研究结果表明，瞬时悬浮液平均阻力与悬浮液中颗粒间 φv 的方差呈正相关。研究还表明，在现有的平均阻力相关性中使用每个颗粒的条件瞬时φv 可以显著提高预测精度。悬浮液的平均侧向力最高可达阻力的 60%，而单个颗粒的数值则高达阻力的 90%。根据悬浮物平均流动变量和 φv 提出了瞬时侧向力相关性。

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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.