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滚筒端面对颗粒物料轴向混合过程影响的离散模拟

  • 侯全勋 董世杰 张泉 冯勇进 王晓宇 刘晓星
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  • 1. 中国矿业大学(北京)化学与环境工程学院,北京 100083 
    2. 中国科学院过程工程研究所多相复杂系统国家重点实验室,北京 100190 
    3. 中国石油大学(北京)重质油国家重点实验室,北京 102249 
    4. 中国科学院大学化学与化工学院,北京 100049 
    5. 核工业西南物理研究院,四川 成都 610041

收稿日期: 2019-01-11

  修回日期: 2019-03-01

  网络出版日期: 2019-10-22

基金资助

国家自然科学基金委员会与中国工程物理研究院联合基金资助;国家重点研发计划

Discrete simulation of influence of drum end-wall on axial mixing behavior of granular material

  • Quanxun HOU Shijie DONG Quan ZHANG Yongjin FENG Xiaoyu WANG Xiaoxing LIU
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  • 1. School of Chemical and Environmental Engineering, China University of Mining & Technology, Beijing 100083, China 
    2. State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China 
    3. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China 
    4. College of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China 
    5. Southwest Institute of Physics, Nuclear Industry, Chengdu, Sichuan 610041, China

Received date: 2019-01-11

  Revised date: 2019-03-01

  Online published: 2019-10-22

Supported by

National Natural Science Foundation of China and the China Academy of Engineering Physics

摘要

基于离散单元法模拟了仅颜色存在差异的两组分颗粒物料在轴径比0.3的窄滚筒中的轴向混合过程,滚筒的左侧端面固定,右侧端面可随侧壁旋转。结果表明,不同物料装载量和滚筒转速下,在达到完全混合状态前,黄红颗粒物料初始轴向界面处可能出现3种不同的径向结构:黄?红结构、红?黄?红结构和红?黄结构。红?黄?红结构和红?黄结构工况下,固定端面一侧还可出现更复杂的多层三明治结构。径向结构源自滚筒端面效应导致的颗粒轴向对流,颗粒轴向速度在切向截面上的分布决定了径向结构的类型。

本文引用格式

侯全勋 董世杰 张泉 冯勇进 王晓宇 刘晓星 . 滚筒端面对颗粒物料轴向混合过程影响的离散模拟[J]. 过程工程学报, 2019 , 19(5) : 949 -958 . DOI: 10.12034/j.issn.1009-606X.219108

Abstract

Drum has been widely used to handle granular materials in various industries such as mining, metallurgy and chemical engineering. Thorough understanding of the complex flow behavior of granular material is critical to the design, optimization and scale-up of drum apparatus. A rather short rotating drum with the ratio of axial length to diameter equal to 0.3 was focused in this work. By performing discrete element method (DEM) simulations, the axial mixing process of binary granular material in such short drum was investigated. The drum was asymmetrically operated with the left end-wall fixed and the other rotated with side wall. The particles only differed in color (yellow versus red). The yellow and red particles were initially arranged side by side axially. The simulation results indicated that the system inevitably went through a radial segregation state before attaining the full mixing state. Depending on the filling degree and rotating speed, there could be three types of radial pattern at the initial axial interface of yellow and red materials: yellow?red, red?yellow?red and red?yellow. As to cases of the latter two structures, a more complex multi-layer sandwich type radial segregation pattern could be observed in the half side close to the fixed end wall. The analyses of the axial flow structure demonstrate that the occurrence of radial pattern can be ascribed to the end-wall effect: due to the asymmetrical operation of end-walls, clear axial convection structure was formed. And the exact distribution of particle axial velocity in the transverse cross-section determined the type of radial segregation.

参考文献

[1]Arntz M M H D, Otter W K D, Beeftink H H, et al.The influence of end walls on the segregation pattern in a horizontal rotating drum[J].Granular Matter, 2013, 15(1):25-38 [2]Arntz M M H D, Otter W K D, Briels W J, et al.Granular mixing and segregation in a horizontal rotating drum: A simulation study on the impact of rotational speed and fill level[J].Aiche Journal, 2010, 54(12):3133-3146 [3]Chen P, Ottino J M, Lueptow R M.Granular axial band formation in rotating tumblers: a discrete element method study[J].New Journal of Physics, 2016, 13(5):055021- [4]Staron L, Phillips J C.Segregation time-scale in bi-disperse granular flows[J].Physics of Fluids, 2014, 26(3):147-158 [5]Aranson I S, Tsimring L S.Patterns and collective behavior in granular media: Theoretical concepts[J].Review of Modern Physics, 2008, 78(2):641-692 [6]Dury C M, Ristow G H.Radial segregation through axial migration[J].Epl., 1999, 48(1):60-65 [7]Kuo H P, Hsu R C, Hsiao Y C.Investigation of axial segregation in a rotating drum[J].Powder Technology, 2005, 153(3):196-203 [8]Donald M B, Roseman B.Mixing and demixing of solid particles, Part Ⅰ, Mechanisms in a horizontal drum mixer.[J]., 1962, 7:749-753 [9]Gupta S D, Khakhar D V, Bhatia S K.Axial segregation of particles in a horizontal rotating cylinder[J].Chemical Engineering Science, 1991, 46(5–6):1513-1517 [10]Hill K M, Kakalios J.Reversible axial segregation of binary mixtures of granular materials[J].Physical Review E, 1994, 49(49):R3610-R3613 [11]Hill K M, Kakalios J.Reversible axial segregation of rotating granular media[J].Physical Review E, 1995, 52(4):4393-4400 [12]Zik O, Levine D, Lipson S G, et al.Rotationally induced segregation of granular materials[J].Physical Review Letters, 1994, 73(73):644-647 [13]Santomaso A, Olivi M, Canu P.Mechanisms of mixing of granular materials in drum mixers under rolling regime[J].Chemical Engineering Science, 2004, 59(16):3269-3280 [14]Santomaso A, Olivi M, Canu P.Mixing kinetics of granular materials in drums operated in rolling and cataracting regime[J].Powder Technology, 2005, 152(1):41-51 [15]Santomaso A C, Petenò L, Canu P.Radial segregation driven by axial convection[J].Epl., 2006, 75(4):576-582 [16]Dury C M, Ristow G H, Moss J L, et al.Boundary Effects on the Angle of Repose in Rotating Cylinders[J].Physical Review E Statistical Physics Plasmas Fluids & Related Interdisciplinary Topics, 2012, 57(4):4491-4497 [17]Pohlman N A, Ottino J M, Lueptow R M.End-wall effects in granular tumblers: From quasi-two-dimensional flow to three-dimensional flow[J].Physical Review E Statistical Nonlinear & Soft Matter Physics, 2006, 74(3 Pt 1):031305- [18]Cui Z, Zhao Y, Chen Y, et al.Transition of axial segregation patterns in a long rotating drum[J].Particuology, 2014, 13(2):128-133 [19]Chen P, Ottino J M, Lueptow R M.Subsurface granular flow in rotating tumblers: a detailed computational study[J].Physical Review E Statistical Nonlinear & Soft Matter Physics, 2008, 78(1):021303- [20]Chen P, Ottino J M, Lueptow R M.Onset mechanism for granular axial band formation in rotating tumblers[J].Physical Review Letters, 2010, 104(18):188002- [21]Liu X, Ge W, Xiao Y, et al.Granular flow in a rotating drum with gaps in the side wall[J].Powder Technology, 2008, 182(2):241-249 [22]Guo Y, Curtis J S.Discrete element method simulations for complex granular flows[J].Annual Review of Fluid Mechanics, 2015, 47(1):21-46 [23]Gui N, Fan J.Numerical study of heat conduction of granular particles in rotating wavy drums[J]. [J]., 2015, 84:740-751 [24]孙其诚, 刘晓星, 张国华, 等.密集颗粒物质的介观尺度研究综述[J].力学进展, 2017, 47(8):263-308 [25]Sun Q C, Liu X X, Zhang G H, et al.The mesoscopic structures of dense granular materials[J].Mechanical Progress, 2017, 47(8):263-308 [26]Kruyt N P, Ye M, Zeilstra C, et al.Longitudinal and transverse mixing in rotary kilns: A discrete element method approach[J].Chemical Engineering Science, 2005, 60(15):4083-4091 [27]Khan Z S, Morris S W.Subdiffusive axial transport of granular materials in a long drum mixer[J].Physical Review Letters, 2005, 94(4):048002- [28]Richard N T P.Diffusion of a granular pulse in a rotating drum[J].Physical Review E Statistical Nonlinear & Soft Matter Physics, 2006, 73(1):041301- [29]Boateng A A, Barr P V .Granular flow behaviour in the transverse plane of a partially filled rotating cylinder[J].[J]., 1997, 330:233-249 [30]Alizadeh E, Dubé O, Bertrand F, et al.Characterization of Mixing and Size Segregation in a Rotating Drum by a Particle Tracking Method[J].Aiche Journal, 2013, 59(6):1894-1905 [31]Yang S, Cahyadi A, Wang J, et al.DEM study of granular flow characteristics in the active and passive regions of a three-dimensional rotating drum[J].Aiche Journal, 2016, 62(11):3874-3888 [32]Khakhar D V, Mccarthy J J, Ottino J M.Radial segregation of granular mixtures in rotating cylinders[J].Physics of Fluids, 1997, 9(12):3600-3614 [33]Aranson I S, Tsimring L S.Patterns and collective behavior in granular media: Theoretical concepts[J].Reviews of Modern Physics, 2006, 78(2):641-692 [34]Zhu H P, Zhou Z Y, Yang R Y, et al.Discrete particle simulation of particulate systems: A review of major applications and findings[J].Chemical Engineering Science, 2008, 63(23):5728-5770
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