柱状和球形颗粒在锥形布料盘表面的运动特性
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摘要
采用离散元法(DEM)对柱状和球形颗粒在开槽前后正锥形布料盘表面的运动过程进行数值模拟,研究颗粒在锥形布料盘表面的运动速度、布撒轨迹,并探讨开槽前后布料盘直径、转速以及颗粒形状对运动过程的影响。结果表明:颗粒出盘的水平、竖直速率随布料盘转速和直径的增大而增大;柱状颗粒出盘的水平、竖直速率略大于球形颗粒;布料盘开槽后颗粒的过槽率随布料盘转速的增大而减小,随布料盘直径的增大而增大;柱状颗粒的过槽率大于球形颗粒;布料盘开槽后颗粒出盘的水平、竖直速率大于开槽前。
Discrete element method (DEM) was used to simulate their motion characteristics of cylindrical and spherical particles on the surface of conical distributor which was slotted before and after. Velocity and trajectory of the particles on the surface of conical distributor were studied. The effects of particle shape,diameter and rotational speed of the distributor being slotted before and after on the motion were studied. The results show that horizontal and vertical velocity of particles out of the distributor increase with the increase of rotating speed and diameter of the distributor. Horizontal and vertical velocity of the cylindrical particle is slightly faster than that of the spherical particle. Rate of the through-slot particle decreases with the increase of the rotational speed of the distributor and increases with the increase of diameter of the distributor. Besides,rate of the cylindrical through-slot particle is higher than that of the spherical particle. Horizontal and vertical velocity of particle out of the slotted distributor is higher than those of none-slotted one.
Discrete element method (DEM) was used to simulate their motion characteristics of cylindrical and spherical particles on the surface of conical distributor which was slotted before and after. Velocity and trajectory of the particles on the surface of conical distributor were studied. The effects of particle shape,diameter and rotational speed of the distributor being slotted before and after on the motion were studied. The results show that horizontal and vertical velocity of particles out of the distributor increase with the increase of rotating speed and diameter of the distributor. Horizontal and vertical velocity of the cylindrical particle is slightly faster than that of the spherical particle. Rate of the through-slot particle decreases with the increase of the rotational speed of the distributor and increases with the increase of diameter of the distributor. Besides,rate of the cylindrical through-slot particle is higher than that of the spherical particle. Horizontal and vertical velocity of particle out of the slotted distributor is higher than those of none-slotted one.
引文
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[3]GENNES P G. Granular matter:a tentative view[J]. Reviews of Modern Physics,1999,71(2):374-382.
[4]王勤辉,杨秋辉,吴学成,等.多相流中颗粒旋转运动特性的研究进展[J].化工学报,2011,62(9):2381-2390.
[5]GUI N,YANG X T,TU J Y,et al. Numerical simulation of tetrahedral particle mixing and motion in rotating drums[J]. Particuology,2018,(39):1-11.
[6]李艳洁,吴腾,林剑辉,等.基于离散元法的贯入圆锥对沙土颗粒运动特性分析[J].农业工程学报,2012,28(24):55-61.
[7]潘兵,刘雪东,刘文明,等.基于离散元法的催化剂密相装填过程数值模拟[J].中国粉体技术,2011(6):32-37.
[8]王志龙.摆动循环流化床内颗粒运动特性的研究[D].西安:西安理工大学,2015.
[9]MA L C,WEI L B,PEI X Y,et al. CFD-DEM simulations of particle separation characteristic in centrifugal compounding force field[J].Powder Technology,2019(343):11-18.
[10]许晶,刘雪东,仇康.文丘里粉体喷射器内部颗粒运动特性的联合仿真[J].中国粉体技术,2016,22(4):39-43.
[11]XU J,LIU X D,PAN M J. Numerical and experimental studies on transport properties of powder ejector based on double venturi effect[J].Vacuum,2016(134):92-98.
[12]TONO K, IENAGA S. Catalyst packing method and device therefore:JP10043576[P]. 1998-02-17.
[13]FENG Y Q,XU B H,ZHANG S J,et al. Discrete particle simulation of gas fluidization of particle mixtures[J]. Aiche Journal,2010,50(8):1713-1728.
[14]WU H,GUI N,YANG X,et al. Numerical simulation of heat transfer in packed pebble beds:CFD-DEM coupled with particle thermal radiation[J]. International Journal of Heat and Mass Transfer,2017,110(5):393-405.
[15]李斌,于洋,马梦祥,等.三维喷动床内异径干湿颗粒混合特性数值模拟[J].化工学报,2017,68(12):4545-4555.
[16]陈程,刘雪东,罗召威,等.旋转流化床粉体混合机混合效果数值模拟和实验验证[J].化工进展,2018,37(9):3294-3302.
[17]文愿运,刘马林,刘荣正,等.颗粒离散单元法数值模拟与典型实验对比研究[J].中国粉体技术,2015,21(3):1-5.
[18]马明祥.差异旋转运动中惯性力作用的试验研究[D].乌鲁木齐:新疆农业大学,2013.