Segregation of Construction Materials in Silos. Part 2: Identification of Relevant Segregation Mechanisms
Segregation of Construction Materials in Silos. Part 2: Identification of Relevant Segregation Mechanisms
复制标题
筒仓中建筑材料的隔离。
DOI：
10.1080/02726351.2011.552097
复制
发表时间：
2012
影响因子：
2.5
通讯作者：
G. G. Enstad
中科院分区：
文献类型：
--
作者：
N. Engblom;H. Saxén;R. Zevenhoven;H. Nylander;G. G. Enstad
在不同规模的筒仓中对商业干矿物基建筑产品和类似这些产品的混合物进行了分离研究，结果分为两部分。这项工作包括第二部分，其中通过小规模（0.5 m3）实验确定了在筒仓中处理建筑材料的相关隔离机制。通过对堆的上层取样，确定了充填时颗粒的径向分布，研究了不同初始条件对卸料时偏析的影响，并用示踪颗粒识别了总体卸料流型。结果表明，混合料的质量主要取决于充填时引起的偏析和放电流型，即在放电时没有明显的偏析机制。在小型筒仓中进行的实验结果在中型（20立方米）和大型（70立方米）中都得到了证实。基于这些结果，我们认为在筒仓中处理的商业建筑材料的离析是由埋置、流化和气流效应共同引起的。
The segregation of commercial dry mineral-based construction products and a mixture resembling these has been investigated in silos of different scale, and the results are presented in two parts. This work encompasses the second part, where the relevant segregation mechanisms for the handling of construction materials in silos have been identified through experiments in small scale (0.5 m3). The radial distribution of the particles at filling was determined by sampling from the upper layers of the heap and the influence of different initial conditions on the segregation at discharge was investigated, the overall discharge flow pattern being identified with tracer particles. The results imply that the quality of the mixture is mainly determined by the segregation induced at filling and by the discharge flow pattern, that is, no segregation mechanisms are active to a significant degree at discharge. The findings from the experiments in the small silo were confirmed both in intermediate (20 m3) and large (70 m3) scale. Based on these results, it is suggested that segregation of commercial construction materials handled in silos is caused by a combination of embedding, fluidization, and air-current effects.