Numerical study of wall normal stress and discharging characteristics for gravity blending silo

IF 2.8 3区工程技术 Q1 MATHEMATICS, INTERDISCIPLINARY APPLICATIONS

Computational Particle Mechanics Pub Date : 2023-03-15 DOI:10.1007/s40571-023-00570-5

Jiawei Zhou, Chong Fu, Shu Jiang, Yanhua Wang, Xiaohui Liu, Linjian Shangguan

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Abstract

In this work, the wall normal stress and the discharging characteristics of the granular material of gravity blending silo were numerically studied. The simulation accuracy of wall stress distribution and the granular discharge capability were separately verified by experiment. The over pressure and loss pressure phenomena during discharging, the redistribution of the wall normal stress of silo with internal blending pipe, and the influence of blending opening parameters on the performance of the discharge were examined. The results showed that: (1) the maximum over pressure values of transient pressure peak and stable wall normal stress during discharging were not more than 5 times and 2 times of the static pressure values, respectively. The inner blending pipes could dramatically reduce the over pressure. (2) The inner blending pipes could also disorganize wall stress and produce pressure screening effect. The mean values of dimensionless pressure for the four simulated blending pipe locations were all approximately 0.65. (3) The closer the opening of the blending pipe to the granular surface, the larger the discharging mean mass flow rate. (4) The vibration blending pipe could gently improve the granular flow capability. The controlled amplitude conditions had a better impact on the flow capability than the vibration frequency.

Graphical abstract

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重力混合筒仓壁正应力及出料特性的数值研究

本文对重力混合料仓的壁正应力和颗粒物料的出料特性进行了数值研究。通过实验分别验证了壁面应力分布和颗粒排出能力模拟的准确性。研究了出料过程中的过压和失压现象、内配管筒仓壁正应力的重新分布以及配管开口参数对出料性能的影响。结果表明:(1)放电过程中瞬态压力峰值和稳定壁正应力的最大超压值分别不大于静压值的5倍和2倍。内配管可以显著降低超压。(2)内配管还能分散管壁应力，产生压力筛选作用。4个模拟混合管位置的无量纲压力平均值均接近0.65。(3)混合管开口越靠近颗粒表面，出料平均质量流量越大。(4)振动掺混管能温和地提高颗粒流动能力。控制振幅条件对流动能力的影响优于振动频率条件。图形抽象

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来源期刊

Computational Particle Mechanics Mathematics-Computational Mathematics

CiteScore

5.70

自引率

9.10%

发文量

期刊介绍： GENERAL OBJECTIVES: Computational Particle Mechanics (CPM) is a quarterly journal with the goal of publishing full-length original articles addressing the modeling and simulation of systems involving particles and particle methods. The goal is to enhance communication among researchers in the applied sciences who use "particles'''' in one form or another in their research. SPECIFIC OBJECTIVES: Particle-based materials and numerical methods have become wide-spread in the natural and applied sciences, engineering, biology. The term "particle methods/mechanics'''' has now come to imply several different things to researchers in the 21st century, including: (a) Particles as a physical unit in granular media, particulate ﬂows, plasmas, swarms, etc., (b) Particles representing material phases in continua at the meso-, micro-and nano-scale and (c) Particles as a discretization unit in continua and discontinua in numerical methods such as Discrete Element Methods (DEM), Particle Finite Element Methods (PFEM), Molecular Dynamics (MD), and Smoothed Particle Hydrodynamics (SPH), to name a few.