Mechanism of Segregation of Differently Shaped Particles in Filling Containers
Mechanism of Segregation of Differently Shaped Particles in Filling Containers
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灌装容器中不同形状颗粒的偏析机理
DOI：
10.1021/i260070a006
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发表时间：
1979
期刊：
影响因子：
--
通讯作者：
K. Shinohara
中科院分区：
文献类型：
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作者：
K. Shinohara
本文分析了贮液容器充填过程中颗粒按形状分离的机理。理论方法是基于作者以前提出的尺寸偏析效应的筛选模型。角状颗粒的夹带，通过流动层聚集在流动层和固定层之间的堆的界面上，表征了形状偏析过程。角状颗粒沉积在中心进料点附近，形成V形区域。虽然这种模式类似于尺寸偏析，但两种过程的机制不同。在本分析中，观察到的偏析模式解释了不同的初始混合比的饲料颗粒，饲料的速度，和容器的顶角。偏析的颗粒混合物由于大小的差异是众所周知的，但很少有资料报道的影响，颗粒形状的偏析在一个存储容器（Denburg和Bauer，1964年）。主要原因之一在于，尽管可以用数学方法来表达颗粒形状（Cheng和萨顿，1971），但很难将颗粒的物理行为与它们的数学形状定义联系起来。事实上，颗粒形状在几何学上与尺寸不可分，在运动学上与表面摩擦效应不可分。在粒子集合体内的偏析的情况下，形状影响粒子的移动性
The mechanism by which particles segregate according to shape during the filling of storage vessels is analyzed. The theoreticalapproach is based on a screening model proposed previously by the author for size segregation effects. The entrainment of angular particles, which have percolated through the flowing layer to collect at the interface between the flowingand stationary layers of the heap, characterizes the shape segregation process. Angular particles are deposited near the central feed point and form a V-shaped zone. While this pattern is similar to that resulting from size segregation, the mechanism of the two processes is different. In the present analysis, the segregation patterns observed are explained for various initial mixing ratios of feed particles, rates of feed, and apex angles of the vessel.The segregation of particle mixtures due to size dif-ferences is well known, but little information has been reported on the effects of particle shape on segregation within a storage vessel (Denburg and Bauer, 1964). One of the main reasons lies inthe fact that, though it may be possible to express particle shape mathematically (Cheng and Sutton, 1971), it is difficult to relate the physical behavior of particles to their mathematical shape definition. As a matter of fact, particle shape is not separable from size geometrically nor is it separable from surface frictional effects kinematically. In the case of segregation within a particle assembly, shape affects particle mobility