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Gandhi P, Kuhnhold A. The effect of particle geometry and initial configuration on the phase behavior of twisted convex n-prisms. SOFT MATTER 2024; 20:5351-5358. [PMID: 38913010 DOI: 10.1039/d4sm00585f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/25/2024]
Abstract
We study the phase behavior of twisted convex n-prisms with n = 3 and 4, via Monte Carlo simulations. Biaxial phases, in untwisted prisms, can be induced by choosing specific geometries of the prisms. However, due to the convexity of the twisted particles, a strong twisting disables the formation of biaxial phases and stabilizes uniaxial nematic and smectic phases. Using the increased volume of the twisted convex particles, we define an effective aspect ratio of the twisted prisms and find a homogeneous phase behavior across the geometry of the prisms' cross-section and even across different shapes of the cross-section. In this representation biaxial phases are found for large aspect ratios, while the low aspect ratio behavior can be compared to the hard cylinder phase diagram. For 3-prisms with a small base angle, we show the influence of the initial configuration; a polar initial configuration results in a (polar) splay nematic phase, whereas a non-polar initial configuration results in a biaxial phase.
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Affiliation(s)
- Poshika Gandhi
- Institute of Physics, University of Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany.
| | - Anja Kuhnhold
- Institute of Physics, University of Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany.
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Ma H, Zhou L, Liu Z, Chen M, Xia X, Zhao Y. A review of recent development for the CFD-DEM investigations of non-spherical particles. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2022.117972] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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3
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Zhang J, Xie C, Cao L, Zhou H, Li C, Wang L. Determination of physical and interaction parameters of green pepper (Zanthoxylum armatum): Investigation of the mechanism of significant factors against the repose angle. Lebensm Wiss Technol 2022. [DOI: 10.1016/j.lwt.2022.113409] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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4
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Zhang Z, Liu Y, Zheng B, Sun P, Li R. Discharge Characteristics of Different Shaped Particles from an Inclined Bottom Rectangular Hopper. ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 2022. [DOI: 10.1007/s13369-021-05584-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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5
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Self-similarity of density and velocity profiles in a 2D hopper flow of elliptical particles: Discrete element simulation. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2022.117338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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6
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Discharge of vibrated granular silo: A grain scale approach. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2021.11.042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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7
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El-Emam MA, Zhou L, Shi W, Han C. Performance evaluation of standard cyclone separators by using CFD–DEM simulation with realistic bio-particulate matter. POWDER TECHNOL 2021. [DOI: 10.1016/j.powtec.2021.03.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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8
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Preud’homme N, Opsomer E, Vandewalle N, Lumay G. Effect of grain shape on the dynamics of granular materials in 2D rotating drum. EPJ WEB OF CONFERENCES 2021. [DOI: 10.1051/epjconf/202124906002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We experimentally investigate the effect of the grain shape on the flow of granular material. The grain shape is modified to highlight the effect of grain circularity on granular flow in a 2D rotating drum. Using a laser cutter, we create particles with decreasing circularity. We observe that the effect of grain shape depends on the rotation speed of the drum. For high rotation speed, granular flow is influenced by the packing’s dilatancy whereas, at low rotation speed, packing fraction seems to influence flowing dynamics. We link these two measurements to grain shape in order to explain its effect on granular flow.
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Pascot A, Marouazi G, Kiesgen De Richter S. Discharge of a granular silo under mechanical vibrations. EPJ WEB OF CONFERENCES 2021. [DOI: 10.1051/epjconf/202124903037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
In this paper, we study the flow rate of model granular material in a silo under the influence of mechanical vibrations. Experimental measurements and discrete element simulations (DEM) are performed in a quasi-2D silo. The influence on the flow rate of the opening size and the vibration applied on the entire silo is studied. Two distinct regimes are evidenced, governed by the Froude number Fr and the relative frequency Ω. In the first regime, a decreased flow rate is observed when increasing the vibration intensity. This behavior is explained by the presence of reorganizations induced by the vibration, leading to a more homogeneous but also slower flow. In the second regime, an increased flow rate is evidenced when increasing the vibration intensity. We find this behavior comes from the intermittent nature of the flow, where the flow rate is directly controlled by the propagation of shock waves all along the silo.
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Effect of lognormal particle size distributions of non-spherical particles on hopper discharge characteristics. Chem Eng Res Des 2020. [DOI: 10.1016/j.cherd.2020.09.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Pascot A, Gaudel N, Antonyuk S, Bianchin J, Kiesgen De Richter S. Influence of mechanical vibrations on quasi-2D silo discharge of spherical particles. Chem Eng Sci 2020. [DOI: 10.1016/j.ces.2020.115749] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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12
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Investigation of discharge characteristics of rod-shaped particles in a hopper: Experimental and numerical studies using polygonal/polyhedral DEM. ADV POWDER TECHNOL 2020. [DOI: 10.1016/j.apt.2020.08.024] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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13
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Wang S, Zhuravkov M, Ji S. Granular flow of cylinder-like particles in a cylindrical hopper under external pressure based on DEM simulations. SOFT MATTER 2020; 16:7760-7777. [PMID: 32744286 DOI: 10.1039/c9sm02435b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Granular flow is widely found in nature or industrial production. Although the external driving force significantly affects the dynamic behavior of a granular system, a large number of numerical simulations have been conducted to study granular flows driven by gravity. In this study, a superquadric equation was used to construct spherical and cylindrical elements, and the flow processes of granular materials under external pressure were simulated by the discrete element method. To examine the validity of the DEM model, the Janssen effect of spherical particles, the static packing of cylindrical particles and the flow process of spherical particles under external pressure are simulated and compared with the previous experimental and theoretical results. Subsequently, the effects of blockiness, orifice diameter, and particle friction on the flow characteristics are investigated. Results show that the flow rate of spherical particles increases as the external pressure and opening diameter increase or the particle friction decreases. However, the flow rate of cylindrical particles decreases as the blockiness parameter increases, and the external pressure has little effect on the flow rate of the cylindrical particles when the blockiness parameter is greater than 4. Furthermore, the external pressure causes a change in the flow pattern of granular systems. In a gravity-driven granular flow, cylindrical particles appear in funnel flow, and spherical particles in both mass and funnel flows. In a pressure-driven granular flow, spherical particles appear in mass flow, and cylindrical particles in both mass and funnel flows. The critical height of the transition between mass and funnel flows decreases with increasing external pressure and eventually reaches a steady state. Meanwhile, the critical height increases with the blockiness parameter, which indicates that more cylindrical than spherical particles appear in funnel flow. Finally, the basic flow characteristics of granular materials under external pressure are further analyzed by the velocity uniformity index, the normal contact force between particles, and the bottom pressure. Overall, the numerical results are useful for understanding the changes in the flow characteristics of spherical and cylindrical granular materials under external pressure, and further provide guidance for the appropriate design and optimization of cylindrical hoppers.
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Affiliation(s)
- Siqiang Wang
- State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116023, China.
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Luo X, Zhao L, Zhang M, Dong H. DEM study on the effects of pellet characteristics on particle flow in rectangular hopper. POWDER TECHNOL 2020. [DOI: 10.1016/j.powtec.2020.06.027] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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15
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Calibration of the discrete element method: Strategies for spherical and non-spherical particles. POWDER TECHNOL 2020. [DOI: 10.1016/j.powtec.2020.01.076] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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16
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Lin J, Chen H, Liu L. Impact of polydispersity of particle shape and size on percolation threshold of 3D particulate media composed of penetrable superellipsoids. POWDER TECHNOL 2020. [DOI: 10.1016/j.powtec.2019.10.054] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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17
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The effect of particle shape on porosity of swelling granular materials: Discrete element method and the multi-sphere approximation. POWDER TECHNOL 2020. [DOI: 10.1016/j.powtec.2019.09.036] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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18
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Lattanzi AM, Stickel JJ. Hopper flows of mixtures of spherical and rod‐like particles via the multisphere method. AIChE J 2019. [DOI: 10.1002/aic.16882] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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19
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Naderi S, Zhang M. An integrated framework for modelling virtual 3D irregulate particulate mesostructure. POWDER TECHNOL 2019. [DOI: 10.1016/j.powtec.2019.07.089] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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20
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Ge L, Gui N, Yang X, Tu J, Jiang S. Effects of aspect ratio and component ratio on binary-mixed discharging pebble flow in hoppers. POWDER TECHNOL 2019. [DOI: 10.1016/j.powtec.2019.07.045] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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21
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DEM analysis of the flow and friction of spherical particles in steel silos with corrugated walls. POWDER TECHNOL 2019. [DOI: 10.1016/j.powtec.2019.07.072] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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22
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Han Y, Jia F, Li G, Liu H, Li J, Chen P. Numerical analysis of flow pattern transition in a conical silo with ellipsoid particles. ADV POWDER TECHNOL 2019. [DOI: 10.1016/j.apt.2019.06.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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23
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24
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Xia Y, Lai Z, Westover T, Klinger J, Huang H, Chen Q. Discrete element modeling of deformable pinewood chips in cyclic loading test. POWDER TECHNOL 2019. [DOI: 10.1016/j.powtec.2018.12.072] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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25
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Ma H, Zhao Y, Cheng Y. CFD-DEM modeling of rod-like particles in a fluidized bed with complex geometry. POWDER TECHNOL 2019. [DOI: 10.1016/j.powtec.2018.12.066] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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26
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Kumar R, Patel CM, Jana AK, Gopireddy SR. Prediction of hopper discharge rate using combined discrete element method and artificial neural network. ADV POWDER TECHNOL 2018. [DOI: 10.1016/j.apt.2018.08.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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27
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Wang S, Fan Y, Ji S. Interaction between super-quadric particles and triangular elements andits application to hopper discharge. POWDER TECHNOL 2018. [DOI: 10.1016/j.powtec.2018.08.026] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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28
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Investigating the fluidization of disk-like particles in a fluidized bed using CFD-DEM simulation. ADV POWDER TECHNOL 2018. [DOI: 10.1016/j.apt.2018.06.017] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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29
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Ma H, Zhao Y. CFD-DEM investigation of the fluidization of binary mixtures containing rod-like particles and spherical particles in a fluidized bed. POWDER TECHNOL 2018. [DOI: 10.1016/j.powtec.2018.06.034] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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30
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Effects of rotation speed and rice sieve geometry on turbulent motion of particles in a vertical rice mill. POWDER TECHNOL 2018. [DOI: 10.1016/j.powtec.2017.11.048] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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31
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32
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Peng L, Zou Z, Zhang L, Zhu Q, Li H. GPU-based discrete element simulation on flow stability of flat-bottomed hopper. Chin J Chem Eng 2018. [DOI: 10.1016/j.cjche.2017.07.021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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33
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34
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Wei H, Zan L, Li Y, Wang Z, Saxén H, Yu Y. Numerical and experimental studies of corn particle properties on the forming of pile. POWDER TECHNOL 2017. [DOI: 10.1016/j.powtec.2017.08.051] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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35
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Toson P, Khinast JG. Impulse-based dynamics for studying quasi-static granular flows: Application to hopper emptying of non-spherical particles. POWDER TECHNOL 2017. [DOI: 10.1016/j.powtec.2017.03.016] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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36
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37
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A parametric evaluation of powder flowability using a Freeman rheometer through statistical and sensitivity analysis: A discrete element method (DEM) study. Comput Chem Eng 2017. [DOI: 10.1016/j.compchemeng.2016.11.034] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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38
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Yan P, Zhang J, Fang Q, Zhang Y, Fan J. 3D numerical modelling of solid particles with randomness in shape considering convexity and concavity. POWDER TECHNOL 2016. [DOI: 10.1016/j.powtec.2016.06.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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39
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Zhong W, Yu A, Liu X, Tong Z, Zhang H. DEM/CFD-DEM Modelling of Non-spherical Particulate Systems: Theoretical Developments and Applications. POWDER TECHNOL 2016. [DOI: 10.1016/j.powtec.2016.07.010] [Citation(s) in RCA: 334] [Impact Index Per Article: 41.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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40
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Gui N, Yang X, Jiang S, Tu J, Fan J. Extended HPM-DEM coupled simulation of drainage of square particles in a 2D hopper flow. AIChE J 2016. [DOI: 10.1002/aic.15191] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Nan Gui
- 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 P.R. China
| | - Xingtuan Yang
- 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 P.R. China
| | - 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 P.R. China
| | - Jiyuan Tu
- 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 P.R. China
- School of Aerospace, Mechanical & Manufacturing Engineering; RMIT University; Melbourne VIC 3083 Australia
| | - Jianren Fan
- State Key Laboratory of Clean Energy Utilization; Zhejiang University; Hangzhou 310027 P.R. China
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