Granular size segregation in silos with and without inserts
Granular size segregation in silos with and without inserts
复制标题
带或不带插入件的筒仓中的粒度分离
DOI：
10.1098/rspa.2020.0242
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Davies, C. E.
中科院分区：
文献类型：
--
作者：
Cliff, A.;Fullard, L. A.;Breard, E. C.;Dufek, J.;Davies, C. E.
颗粒物料的储存是工业中的一个关键过程，这推动了对筒仓中流动的研究。不同的材料特性，如颗粒大小，可能会导致混合物的离析。这项工作旨在阐明尺寸差异的影响，并确定如何使用流量校正插入减轻隔离在筒仓排放。旋转台用于收集从三维（3D）打印筒仓中排出的芥菜种子。这是加载不同比例的双分散混合物。在料斗出口附近悬挂了一个3D打印的双锥形插入物，以评估其对流动的影响。分析样品以确定小颗粒物质的质量分数。没有插入物的实验导致与偏析一致的图案。将插入物引入筒仓消除了卸料过程中观察到的分离。离散元法模拟筒仓排放进行了插入和不插入。这些结果反映了物理实验，当与粗粒化分析互补时，解释了刀片的效果。大部分偏析发生在颗粒-空气自由表面，并由大的速度梯度驱动。在有插入件的筒仓中，自由表面处的速度梯度大大减小，因此，离析程度也大大减小。
The storage of granular materials is a critical process in industry, which has driven research into flow in silos. Varying material properties, such as particle size, can cause segregation of mixtures. This work seeks to elucidate the effects of size differences and determine how using a flow-correcting insert mitigates segregation during silo discharge. A rotating table was used to collect mustard seeds discharged from a three-dimensional (3D)-printed silo. This was loaded with bidisperse mixtures of varying proportions. A 3D-printed biconical insert was suspended near the hopper exit to assess its effect on the flow. Samples were analysed to determine the mass fractions of small particle species. The experiments without the insert resulted in patterns consistent with segregation. Introducing the insert into the silo eliminated the observed segregation during discharge. Discrete element method simulations of silo discharge were performed with and without the insert. These results mirrored the physical experiment and, when complimented with coarse graining analysis, explained the effect of the insert. Most of the segregation occurs at the grain–air free surface and is driven by large velocity gradients. In the silo with an insert, the velocity gradient at the free surface is greatly reduced, hence, so is the degree of segregation.
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筒仓中建筑材料的隔离。
影响因子：
2.5
作者：
N. Engblom;H. Saxén;R. Zevenhoven;H. Nylander;G. G. Enstad
通讯作者：
G. G. Enstad
在 3D 打印筒仓中进行混合实验；
影响因子：
5.2
作者：
L. Fullard;A. Godfrey;M. F. Manaf;C. Davies;A. Cliff;M. Fukuoka
通讯作者：
M. Fukuoka
DOI：
10.1098/rspa.2018.0462
发表时间：
2019-01
期刊：
Proceedings of the Royal Society A
影响因子：
--
作者：
L. Fullard;E. Breard;C. Davies;A. Godfrey;M. Fukuoka;A. Wade;J. Dufek;G. Lube
通讯作者：
L. Fullard;E. Breard;C. Davies;A. Godfrey;M. Fukuoka;A. Wade;J. Dufek;G. Lube
锥形质量流料斗的喷射时间 – 库仑模型和锥形模型差异
影响因子：
5
作者：
L. Fullard;C. Davies
通讯作者：
C. Davies