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首页> 外文期刊>International Journal of Multiphase Flow >Investigating the jamming of particles in a three-dimensional fluid-driven flow via coupled CFD-DEM simulations
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Investigating the jamming of particles in a three-dimensional fluid-driven flow via coupled CFD-DEM simulations

机译：通过耦合的CFD-DEM仿真研究三维流体驱动流中的颗粒的干扰

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摘要

The clogging of a dense stream of particles when passing through an orifice occurs ubiquitously in both natural and industrial fields. Since most of the jamming phenomena lead to the negative effects, studying and preventing jamming is of great importance. There are two typical types of jamming due to different types of driving force: (a) gravity-driven jamming and (b) fluid-driven jamming. Among these two types of jamming, the fluid-driven jamming occurs in fluid-driven particle flows, and the initial solid concentration, the fluid velocity, and the orifice-particle size ratio has been demonstrated to have effects on the occurrence of this jamming. Although the individual influence of the initial solid concentration and orifice-particle size ratio on jamming has been studied, the coupled effects of these two factors on jamming are little known. In addition, the complex effects of the fluid velocity on jamming have not been fully discussed. To address these problems, this work performs a three-dimensional simulation of the fluid-driven jamming using the coupled Computational Fluid Dynamics-Discrete Element Method (CFD-DEM) model. At first, the jamming probability under different initial conditions is studied. The jamming probability is displayed on the solid concentration-orifice size ratio plane to illustrate the coupled effects of these two factors on jamming. The simulation results show that the critical solid concentration, at which the jamming probability increases to 1, increases with the orifice-particle size ratio. This is because an orifice with a larger orifice size ratio has a greater particle discharge capacity, which allows more particles to pass through without jamming. Then, we reveal the influence of fluid velocity over a wide range on the fluid-driven jamming type, jamming probability and shape of the jamming dome. To the author's knowledge, this is the first time that the shape of the jamming dome has been related to the fluid velocity. The jamming
机译：在通过孔口时，在天然和工业领域堵塞时，在穿过孔口时堵塞致密颗粒流。由于大多数干扰现象导致负面影响，研究和预防干扰非常重要。由于不同类型的驱动力，有两种典型的干扰：（a）重力驱动的干扰和（b）流体驱动的干扰。在这两种类型的干扰中，在流体驱动的颗粒流动中发生流体驱动的干扰，并且已经证明初始固体浓度，流体速度和孔粒度比对具有对该干扰的发生影响。虽然已经研究了初始固体浓度和孔粒度比对干扰的各个影响，但是这两个因素对干扰的耦合效果很少。此外，尚未完全讨论流体速度对干扰的复杂效果。为了解决这些问题，使用耦合的计算流体动力学 - 离散元件（CFD-DEM）模型，该工作执行流体驱动干扰的三维模拟。首先，研究了不同初始条件下的干扰概率。干扰概率显示在固体浓度 - 孔口尺寸比率平面上，以说明这两个因素对干扰的耦合效果。仿真结果表明，随着孔粒径比，干扰概率增加到1的临界固体浓度增加。这是因为具有较大孔尺寸比的孔的粒子放电容量具有更大的颗粒放电容量，这允许更多的颗粒通过而不会干扰。然后，我们揭示了流体速度在宽范围内的影响，对流体驱动的干扰型，干扰圆顶的干扰概率和形状。对于提交人的知识，这是第一次表达圆顶的形状与流体速度有关。干扰

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  • 来源
  • 作者

    Sun Honglei; Xu Shanlin; Pan Xiaodong; Shi Li; Geng Xueyu; Cai Yuanqiang;

  • 作者单位

    Zhejiang Univ Inst Disaster Prevent &

    Reduct Engn &

    Protect Eng Coll Civil Engn &

    Architecture Hangzhou 310027 Zhejiang Peoples R China;

    Zhejiang Univ Res Ctr Coastal &

    Urban Geotech Engn Coll Civil Engn &

    Architecture Hangzhou Zhejiang Peoples R China;

    Zhejiang Univ Technol Inst Geotech Engn Coll Civil Engn &

    Architecture Hangzhou 31000 Zhejiang Peoples R China;

    Zhejiang Univ Technol Inst Geotech Engn Coll Civil Engn &

    Architecture Hangzhou 31000 Zhejiang Peoples R China;

    Univ Warwick Sch Engn Coventry W Midlands England;

    Zhejiang Univ Res Ctr Coastal &

    Urban Geotech Engn Coll Civil Engn &

    Architecture Hangzhou Zhejiang Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 多相流;
  • 关键词

    Jamming; CFD-DEM; Fluid-driven particle flow; Multi-particle bridging; Jamming arch; Force chain;

    机译：干扰;CFD-DEM;流体驱动的颗粒流动;多粒子桥接;干扰拱;力链;

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