Study on the control effect of exhaust hood on entrained air during particles flow falling and wall collision process

IF 2.4 3区工程技术

Granular Matter Pub Date : 2025-01-03 DOI:10.1007/s10035-024-01501-8

Hongfa Sun, Qingzhuo Feng, Jibo Long, Hao Hu

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Abstract

The air entrainment caused by the transportation, loading and unloading of industrial bulk materials is the main cause of dust diffusion. Local exhaust is the most effective means to control the diffusion of industrial pollutants. In order to study the flow field disturbance and control effect of the exhaust hood on the entrained air. First, a numerical model was established for the exhaust hood to control the air entrainment caused by the particle flow falling and hitting the wall. Secondly, the numerical model was verified using experimental data. Finally, the control of entrained air by the exhaust hood was analysed using a coupled CFD-DEM method, with the exhaust air velocity, the exhaust hood size and the exhaust hood position as variables. The results showed that the best effect on entrained air control was achieved when the exhaust air velocity was 7.5 m/s, the exhaust hood diameter was 125 mm, and the position of the exhaust hood was flush with the secondary wall impact point of the particles flow. The relative velocity recovery coefficient is pioneered to analyze the degree of influence of the three variables on the flow field of entrained air. It was found that the exhaust hood size has the greatest influence on the entrainment air velocity distribution, followed by the exhaust wind speed, and the least impact is the position of the exhaust hood.

Graphical Abstract

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排风罩对颗粒流落和壁面碰撞过程中夹带空气的控制效果研究

工业散料运输、装卸过程中产生的夹带空气是粉尘扩散的主要原因。局部排气是控制工业污染物扩散的最有效手段。为了研究排气罩的流场扰动及对夹带空气的控制效果。首先，建立了排风罩控制颗粒流下落撞击壁面引起的夹带气流的数值模型。其次，用实验数据对数值模型进行了验证。最后，以排风速度、排风罩尺寸和排风罩位置为变量，采用CFD-DEM耦合方法对排风罩的夹带风控制进行了分析。结果表明，当排风速度为7.5 m/s，排风罩直径为125 mm，排风罩位置与颗粒流二次壁撞击点齐平时，控制夹带风效果最佳。首创了相对速度恢复系数来分析这三个变量对夹带气流流场的影响程度。研究发现，排风罩尺寸对夹带气流速度分布影响最大，排风风速次之，排风罩位置影响最小。图形抽象

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.