Ejection times from a conical mass flow hopper – Coulomb and conical model differences
Ejection times from a conical mass flow hopper – Coulomb and conical model differences
复制标题
锥形质量流料斗的喷射时间 – 库仑模型和锥形模型差异
DOI：
10.1016/j.apm.2015.08.005
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发表时间：
2016
影响因子：
5
通讯作者：
C. Davies
中科院分区：
文献类型：
--
作者：
L. Fullard;C. Davies
采用应力场理论对散装固体粉末在质量流料斗-料仓系统中的流动进行了建模。提出了两种常用的模型：库仑模型和圆锥模型。假定速度场与径向坐标的平方成反比。这种简化使我们能够推导出系统中应力场和速度场的表达式。给出了两种模型的抛射时间和停留时间分布，并指出了两种模型之间的差异。特别是，我们发现两种模型的预测差异很大，这对粉末在系统中流动时的排出和混合具有重要意义。本文还对影响库仑模型和圆锥模型预测差异的一些建模参数进行了敏感性分析。这项工作的大部分是基于内德曼（1992）。
The flow of a bulk solid powder through a mass flow hopper-silo system is modelled using stress field theory. Two common models are presented, the Coulomb and the conical model. The assumption is made that the velocity field is inversely proportional to the square of the radial coordinate. This simplification allows us to derive expressions for the stress and velocity fields in the system. The ejection times and residence time distributions for the two models are presented and the differences between the two models are shown. In particular, we find that the predictions of the two models differ greatly which has important implications for discharge and mixing as the powder flows through the system. A sensitivity analysis is also performed on some of the modelling parameters which affect the predicted differences between the Coulomb and conical models. Much of this work is based on Nedderman (1992).