Effect of particle shape on the discharge from a mono-layer hopper

IF 2.9 3区工程技术

Granular Matter Pub Date : 2025-04-01 DOI:10.1007/s10035-025-01517-8

Muhammad Ahmed Hanif, Diego Maza, Devaraj van der Meer

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Abstract

In this work, we performed experiments with spheres, rice-shaped particles with different aspect ratios, and macaroni-shaped particles in a quasi-two-dimensional hopper, where the thickness was adjusted to the minor dimensions of the particles such that a mono-layered system is created. We quantitatively investigate the vertical velocity and solid fraction profiles at the orifice and determine how these are influenced by the slope of the hopper. Interestingly, where the hopper angle hardly influences the velocity profile for rice-shaped particles, the magnitude of the velocity profile increases for spherical particles and decreases for macaroni particles with the steepness of the hopper. The spheres have flat solid fraction profiles for all hopper angles, but a transition from flat to dome-shaped profiles is observed with decreasing hopper steepness for all non-spherical particles. The discharge rate determined by integrating the product of the velocity and solid fraction profiles has good agreement with the experimentally measured discharge rate for all particle shapes.

Graphical Abstract

Experimental images of discharge of (a) spheres, (b) rice (a_s), (c) rice (a_l), and (d) macaroni particles. (e) Discharge rate of different particle shapes with hopper angles.

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颗粒形状对单层料斗出料量的影响

在这项工作中，我们在准二维漏斗中对球体、具有不同宽高比的大米形状颗粒和通心粉形状颗粒进行了实验，其中厚度被调整为颗粒的较小尺寸，从而创建了单层系统。我们定量地研究垂直速度和固体分数分布在孔，并确定这些是如何受到漏斗的坡度的影响。有趣的是，当料斗角度对米状颗粒的速度分布几乎没有影响时，球形颗粒的速度分布的大小随着料斗的陡度而增加，而通心粉状颗粒的速度分布的大小则随着料斗的陡度而减少。对于所有漏斗角度，球体都具有平坦的固体分数轮廓，但对于所有非球形颗粒，随着漏斗陡度的减小，可以观察到从平坦到圆顶形状轮廓的转变。对速度和固相分数曲线积的积分所确定的放电速率与实验测量的所有颗粒形状的放电速率都有很好的一致性。图形摘要(a)球体，(b)大米（as）， (c)大米（al）， (d)通心粉颗粒的实验图像。(e)不同颗粒形状随料斗角度的出料率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Granular Matter MATERIALS SCIENCE, MULTIDISCIPLINARY-MECHANICS

CiteScore

4.30

自引率

8.30%

发文量

期刊介绍： Although many phenomena observed in granular materials are still not yet fully understood, important contributions have been made to further our understanding using modern tools from statistical mechanics, micro-mechanics, and computational science. These modern tools apply to disordered systems, phase transitions, instabilities or intermittent behavior and the performance of discrete particle simulations. >> Until now, however, many of these results were only to be found scattered throughout the literature. Physicists are often unaware of the theories and results published by engineers or other fields - and vice versa. The journal Granular Matter thus serves as an interdisciplinary platform of communication among researchers of various disciplines who are involved in the basic research on granular media. It helps to establish a common language and gather articles under one single roof that up to now have been spread over many journals in a variety of fields. Notwithstanding, highly applied or technical work is beyond the scope of this journal.