ABSTRACT 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.

中文翻译：

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水平气流诱导槽内颗粒流化特性

摘要 沟槽是管道构件中常见的一种结构。在工程应用中，它经常会积聚颗粒，从而可能导致部件故障。本研究的目的是研究这些积累的颗粒在承受高架气流时的流化。对五个流入速度和五个挡板高度进行了实验。首先介绍和分析粒子涌动。粒子涌动的发生取决于无量纲交叉高度和流动的雷诺数。此外，波动的持续时间约为整个流化期的 10%–20%。还开发了一个 MATLAB 程序来获取凹槽下游监测窗口中的粒子数。结果表明，浪涌期间监测到的粒子数量保持稳定。