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Computational Study of Gas-Solid Flow in a Horizontal Stepped Pipeline

机译：水平阶梯管道气固流动的计算研究

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摘要

In this paper, the mechanism governing the particle-fluid flow characters in the stepped pipeline is studied by the combined discrete element method (DEM) and computational fluid dynamics (CFD) model (CFD-DEM) and the two fluid model (TFM). The mechanisms governing the gas-solid flow in the horizontal stepped pipeline are investigated in terms of solid and gas velocity distributions, pressure drop, process performance, the gas-solid interaction forces, solid-solid interaction forces, and the solid-wall interaction forces. The two models successfully capture the key flow features in the stepped pipeline, such as the decrease of gas velocity, solid velocity, and pressure drop, during and after the passage of gas-solid flow through the stepped section. What is more important, the reason of the appearance of large size solid dune and pressure surge phenomena suffered in the stepped pipeline is investigated macroscopically and microscopically. The section in which the blockage problem most likely occurs in the stepped pipeline is confirmed. The pipe wall wearing problem, which is one of the most common and critical problems in pneumatic conveying system, is analysed and investigated in terms of interaction forces. It is shown that the most serious pipe wall wearing problem happened in the section which is just behind the stepped part.
机译：在本文中，通过组合的离散元件方法（DEM）和计算流体动力学（CFD）模型（CFD-DEM）和两个流体模型（TFM）研究了管道中逐步管道中的粒子流体流量的机制。在固体和气体速度分布，压降，工艺性能，气体固体相互作用力，固体相互作用力和固体壁相互作用方面，研究了管道中的气体固体流动的机制。 。这两种模型成功地捕获了阶梯管道中的钥匙流特征，例如气体速度，固体速度和压降的降低，在气固流过阶梯部分的过程中。更重要的是，在阶梯管道中遭受的大尺寸固体沙丘和压力浪涌现象的出现的原因进行了宏观和微观地研究。确认了堵塞问题最有可能发生在阶梯管道中的部分。管壁磨损问题是气动输送系统中最常见和最严重的问题之一，并在相互作用方面进行研究。结果表明，在台阶部分后面的部分中发生了最严重的管壁磨损问题。

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  • 来源
    《Mathematical Problems in Engineering》 |2019年第19期|2545347.1-2545347.15|共15页
  • 作者

    Li Zhengquan; Chu Kaiwei; Pan Renhu; Yu Aibing; Yang Jiaqi;

  • 作者单位

    Jiangxi Univ Sci & Technol Int Res Inst Minerals Met & Mat Ganzhou 341000 Peoples R China|Monash Univ Lab Simulat & Modelling Particulate Syst Chem Engn Melbourne Vic 3800 Australia;

    Shandong Univ Sch Qilu Transportat Jinan 250002 Shandong Peoples R China;

    Fujian Longking Corp Longyan 364000 Peoples R China;

    Monash Univ Lab Simulat & Modelling Particulate Syst Chem Engn Melbourne Vic 3800 Australia|Fujian Longking Corp Longyan 364000 Peoples R China;

    Jiangxi Univ Sci & Technol Int Res Inst Minerals Met & Mat Ganzhou 341000 Peoples R China;

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