Fluidization characteristics of particles in a groove induced by horizontal air flow
Fluidization characteristics of particles in a groove induced by horizontal air flow
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水平气流诱导沟槽内颗粒流态化特性
DOI：
10.1016/j.powtec.2020.01.022
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发表时间：
2020-03-01
影响因子：
5.2
通讯作者：
Li, Yi
中科院分区：
文献类型：
--
作者：
Lin, Zhe;Liu, Zhenxing;Li, Yi
沟槽是管道构件中常见的结构形式。在工程应用中，它经常会积聚颗粒，从而可能导致部件失效。这项研究的目的是研究这些积累的颗粒在头顶气流中的流态化。实验分五种进水速度和五种挡板高度进行。首次提出并分析了粒子涌动现象。颗粒涌动的发生取决于无因次交叉高度和流动的雷诺数。涌浪持续时间约占整个流态化周期的10%-20%。还开发了一个MatLab程序来获得凹槽下游监测窗口中的颗粒物数量。结果表明，在涌浪期间监测到的颗粒物数量保持稳定。喘振过程结束和开始之间的粒子数下降随着斯托克斯数的增加呈指数增加。(C)2020爱思唯尔B.V.保留所有权利。
The groove is a common structure existing in pipeline components. In engineering applications, it often accumulates particles and thus may lead to component failure. The aim of this study is to investigate fluidization of these accumulated particles when subjected to an overhead airflow. Experiments were performed for five inflow velocities and five baffle heights. Particle surging is presented and analyzed for the first. The occurrence of particle surging depends on the non-dimensional crossing height and the Reynolds number of the flow. Moreover, the duration of surges is about 10%-20% of the whole fluidization period. A MATLAB program was also developed to obtain the number of particles in a monitoring window downstream of the groove. The results demonstrate that the number of monitored particles during a surge holds steady. The drop in particle number between the end and the beginning of the surge process increases exponentially with Stokes number. (c) 2020 Elsevier B.V. All rights reserved.