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flow fields and packing states in the discharge flow of noncircular particles-A SIPHPM simulation

Particuology 2017年第6期15卷 10-21页

作者： Nan Gui Xingtuan Yang Jiyuan Tu Shengyao Jiang Institute of Nuclear and New Energy Technology. Collaborative Innovation Center of Advanced Nuclear Energy Technology. Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education. Tsinghua University Beijing 100084 China School of Engineering RMIT University. Melbourne VIC 3083. Australia

Although the discharge flow of spherical materials has been extensively explored, the effect of particle shape on discharge is still poorly understood. The present work explores the two-dimensional discharge flow fields of noncircular particles using the soft-sphere-imbedded pseudo-hard particle model method. Rectangular particles having different aspect ratios （Ra = 1, 1.5, 2-5） and regular polygonal particles hav- ing different numbers of sides （Ns = 3-8, 10） are discharged through hopper beds having different orifice widths （Di = 40, 70.77, 99.13, 125.74, 151.13 mm）. The discharge rates of differently shaped particles in different beds are consistent with Beverloo＇s relation. Moreover, the flow fields are computed and eval- uated to study the effects of Ra, Ns, and Di on particle discharge. The characteristics of particle-particle connections in the discharge process are evaluated according to the temporal evolution and spatial dis- tribution of the contact points. Additionally, the effect of the initial packing on the discharge profile is investigated. The findings help clarify the discharge of noncircular particles.

关键词： Non-spherical discharge flow Hopper Particle Discrete element method

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Effects of volumetric fraction and included angle of composite particles on the discharge of binary mixtures in hoppers

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Particuology 2020年第4期18卷 80-90页

作者： Liange Ge Nan Gui Xingtuan Yang Jiyuan Tu Shengyao Jiang Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy TechnologyKey Laboratory of Advanced Reactor Engineering and SafetyMinistry of EducationTsinghua UniversityBeijing 100084China School of Engineering RMIT UniversityMelbourneVIC 3083Australia

The discharge behavior of particles is important in many industrial applications,such as in the core of a pebble bed reactor,which uses a hopper bed filled with many large *** this work,a mixture composed of two particle types,freely discharged from a pebble bed,is simulated using the discreteelement *** is a spherical pebble of diameter equal to that of the fuel pebble of the *** other is a composite particle comprising three spherical pebbles bonded *** included angleαof the three pebbles characterized the particle conformation,which may affect the discharge behavior of the *** effects of volume fraction of the multi-sphere x(equivalent to the number fraction)on the discharge are also *** patterns,number flow rate,discharge velocity,and mean force of the mixture are computed to help in revealing discharge *** results show that increasing eitherαor x reduces the discharge flow *** and correlations give a quantitative evaluation of the independent effects ofαand *** analysis of velocity and force explains the mechanism relevant to the main influencing factorsαand *** results are helpful in gaining a better understanding of the discharge feature of binary mixtures and in providing a quantitative evaluation of the discharge behavior of the reactor core,especially adverse failure conditions.

关键词： Pebble flow Particle flow discharge flow Hopper bed Binary mixture Discrete element method

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