The flow blockage of the horizontal pipe is a severe problem in dense pneumatic conveying; accelerating the collapse of blockage can improve the efficiency of powder transportation. In this paper, the pipe‐rotation mechanism was proposed for the first time, and its effect on blockage collapse was preliminarily discussed. A horizontal pipe‐rotation geometry with a linear variation of rotating speed was established, and the rotational speed was 0, 150, 300, 450, and 600 rpm, respectively. The collapsing process of a single slug passing through the rotating horizontal pipe was simulated by using the Computational fluid dynamics (CFD)‐discrete element method (DEM) model. The change of mass at the bottom of the pipe and gas velocity distribution was studied. It was found that, in the prophase of flow, centrifugal force is more dominant than circumferential friction; in the anaphase of flow, the opposite is true. In terms of gas velocity distribution and pressure distribution, pipe rotation with different speeds has the same action law to flow blockage collapse. Moreover, 300 rpm was found to be the optimal speed in our study, instead of the faster ones. It is trusted that the method reported in this paper will serve as a helping source for the upcoming studies towards the slug collapse of dense‐phase pneumatic conveying.

中文翻译：

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旋转机制下阻流塌陷时管底质量和气体速度分布的研究

在密集的气动输送中，水平管的流动阻塞是一个严重的问题。加速堵塞的破坏可以提高粉末运输的效率。本文首次提出了管道旋转机理，并初步探讨了其对堵塞塌陷的影响。建立了具有线性变化的转速的水平管道旋转几何形状，转速分别为0、150、300、450和600 rpm。使用计算流体动力学（CFD）-离散元方法（DEM）模型来模拟单个弹头穿过旋转水平管的塌陷过程。研究了管道底部的质量变化和气体速度分布。发现在流动的前期，离心力比周向摩擦更重要；在流动后期，情况恰恰相反。在气体速度分布和压力分布方面，不同速度的管道旋转具有相同的作用规律，以防止堵塞。此外，我们的研究发现300 rpm是最佳速度，而不是更快的速度。值得信赖的是，本文报道的方法将为即将开展的有关密相气力输送段塞塌陷的研究提供帮助。