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Prediction of flow patterns during silo discharges using a finite element approach and its preliminary experimental verification

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Particuology 2015年第1期13卷 42-49页

作者： S.Ding H.Li J.Y.Ooi J.M.Rotter Faculty of Science and Engineering University of AgderGrimstadand Tel-TekPorsgrunnNorway School of Material & Mineral Resources Xi'an University of Architecture & Technology Institute for Infrastructure and Environment School of EngineeringUniversity of Edinburgh

Obtaining a reliable discharge of particulate solids from a storage silo is a prerequisite to securing oper- ational adequacy in solids handling processes. If a silo is poorly designed, an unreliable interrupted discharge often occurs. In this study, an in-house finite element （FE） program was modified to predict the particulate solids flow patterns during discharges from silos, and the effect of a double-cone insert on such flow patterns. In FE modeling, a Eulerian approach was adopted with an assumption of steady-state flow-a state that greatly facilitated investigations on the effects of double-cone inserts on the flow of particulate solids. Predictions were carried out on whether the discharge was in mass flow or funnel flow, associated with the inclination angle of the silo＇s hopper. Predicted results were in agreement with the Jenike Chart, and proved that an upper lateral pressure ratio value gave a better critical hopper half angle to achieve mass flow （EN 1991-4, 2006）. The shape and size of the stagnant zone were further discussed to address the flow channel boundary between the flowing and static solids if the discharge was in a funnel pattern. Results also showed the effects of a double-cone insert on the flow patterns which con- verted silos from funnel flow to mass flow up to a certain hopper inclination angle and would improve the flow pattern even for shallower angles. Experiments were carried out to verify some of the predicted results. Some qualitative comparisons were made between the predicted results and experimental mea- surements, which indicated that further efforts are needed in predicting the shape of the stagnant zone （flow channel boundary） during funnel flow discharges.

关键词： Discharge pattern flow boundary Double-cone insert FE analysis Preliminary verification

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CFD-DEM modelling of suffusion in multi-layer soils with different fines contents and impermeable zones

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第1期24卷 6-19页

作者： Pei WANG Ying GE Tuo WANG Qi-wei LIU Shun-xiang SONG Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityKowloonHong KongChina College of Civil Engineering Hunan UniversityChangsha 410082China

Suffusion in broadly graded granular soils is caused by fluid flow and is a typical cause of *** studies of it have mainly focused on suffusion in homogeneous soil *** this study,the coupled discrete element method(DEM)and computational fluid dynamics(CFD)approach is adopted to model suffusion in multi-layered soils with different fines contents,and soils with one or more impermeable *** parameters of the CFD-DEM model are first calibrated with the classic Ergun test and a good match with experiment is *** suffusion in multi-layered soils with different fines contents and impermeable zones is simulated and *** simulation results show that,for soils with multiple layers,the cumulative eroded mass is mainly determined by the fines content of the bottom *** general,the higher the fines content of the bottom soil layer,the higher the cumulative eroded *** addition,suffusion is more severe if the fines content of the layer above is *** zones inside soil specimens can increase the flow velocity around those zones,facilitating the migration of fine particles and intensifying suffusion.

关键词： Suffusion Layered soils flow boundary Impermeable zones Computational fluid dynamics-discrete element method(CFD-DEM)

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