An approximate consideration on the mechanism of gravity flow of particles through an aperture of a storage vessel on the basis of a block-flow model
An approximate consideration on the mechanism of gravity flow of particles through an aperture of a storage vessel on the basis of a block-flow model
复制标题
基于块流模型的颗粒重力流通过储存容器孔径的机理的近似思考
DOI：
10.1016/0009-2509(74)85017-7
复制
发表时间：
1974
影响因子：
4.7
通讯作者：
T. Tanaka
中科院分区：
文献类型：
--
作者：
K. Shinohara;T. Tanaka
提出了一个模型，特别适用于粘性粉末的颗粒的重力流。首先通过描述容器内固体压力的分布和通过计算孔上方圆柱形块的“流动性”来估计流动准则。一个流量方程是从块上的动态力平衡得到的，它给出了在放电块中的加速度和速度分布。当负载从一种状态切换到另一种状态时，看似稳定的流动实际上是快速波动的流动。模型计算结果解释了料斗排料中的几种常见现象，所述方法为设计提供了明确的依据。
A model is proposed for the gravity flow of particles that is particularly applicable to cohesive powders. The flow criterion is first estimated by describing the distribution of solids pressure within a vessel and by calculating the ‘flowability’ of a cylindrical block above the aperture. A flow rate equation is derived from a dynamic force balance on the block which gives an acceleration and a velocity profile in the discharging block. The seemingly steady flow is in fact a rapidly fluctuating one as the loading switches from one state to another. Computed results from the model explain several well known phenomena in particle discharge from hoppers and the method described gives a clear basis for design.