Abstract In dense pneumatic conveying, flow blockage is a severe problem in the horizontal pipe, so accelerating the collapse velocity of blockage can improve the efficiency of powder transportation. In this paper, we offered a new method of the pipe-rotation mechanism and focused on the effect of this method on blockage collapse from collapse velocity, mass flow rate, and the change of the particle region. The physical model developed is horizontal pipe-rotation geometry at a uniform rotational speed of 0, 150, 300, 450, and 600 rpm, respectively. Then we used a computational fluid dynamics and discrete element method (CFD-DEM) model to investigate a single slug of particles passing through these geometries. The results show that collapse velocity and the mass flow rate increase with increasing rotational speed, which proves that the pipe-rotation mechanism can accelerate the collapse of flow blockage evidently. Moreover, the pipe-rotation mechanism changes the particle region significantly, which is polarized in the lower half of the pipe. It is trusted that the findings reported in this paper well serve as a helping source for further studies toward dense pneumatic conveying.

中文翻译：

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水平管内堵流坍塌的一种新方法：管道旋转机制

摘要 在密集气力输送中，水平管道中的流动堵塞是一个严重的问题，因此加快堵塞的坍塌速度可以提高粉体输送效率。在本文中，我们提出了一种管道旋转机制的新方法，并从坍塌速度、质量流量和颗粒区域的变化重点研究了该方法对堵塞坍塌的影响。开发的物理模型是水平管道旋转几何体，均匀旋转速度分别为 0、150、300、450 和 600 rpm。然后，我们使用计算流体动力学和离散元方法 (CFD-DEM) 模型来研究通过这些几何形状的单个颗粒。结果表明，坍塌速度和质量流量随着转速的增加而增加，这证明管道旋转机制可以明显加速流动阻塞的崩溃。此外，管道旋转机制显着改变了粒子区域，在管道的下半部分极化。可以相信，本文中报告的发现很好地作为进一步研究密集气力输送的帮助来源。