微米颗粒在湍流中团聚的建模与模拟:圆柱扰动和颗粒性质的影响

IF 4.3 3区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Shuang Wang, Lin Mu, Chu Wang, Xue Li, Jun Xie, Yan Shang, Hang Pu and Ming Dong*, 
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引用次数: 0

摘要

燃煤产生的飞灰是PM2.5的主要来源之一,因此燃煤锅炉的颗粒物去除技术越来越受到重视。紊流凝聚已成为提高环境中细颗粒物去除效率的有力工具,引起了人们对其研究的兴趣。我们的研究细致地考察了圆柱涡尾迹对颗粒流动、团聚模式以及流体与颗粒之间动力学的影响。通过采用一种新颖的混合计算方法,将离散元法(DEM)与大涡模拟(LES)相结合,我们能够准确地模拟粒子-粒子相互作用。研究的重点是了解不同直径(2、5、10和20 μm)、密度(2,500、5,000、7,500和10,000 kg·m-3)和表面能(0.01、0.1和1 J·m-2)的颗粒在过渡剪切层流动条件下的表现。我们的研究结果表明,颗粒倾向于聚集在较低涡度的区域,由于它们对湍流力的弹性,较大和较密的颗粒表现出更高的聚集效率。相反,随着对剪切力的敏感性增加,密度较低的颗粒形成较小的团聚体。此外,研究发现,更高的表面能增强附着力,导致形成更大的团聚体。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Modeling and Simulation of Micron Particle Agglomeration in a Turbulent Flow: Impact of Cylindrical Disturbance and Particle Properties

The fly ash generated by coal combustion is one of the main sources of PM2.5, so the particulate matter removal technology of coal-fired boilers is receiving increasing attention. Turbulent agglomeration has emerged as a powerful tool for improving the efficiency of removing fine particulates from environments, sparking interest in its study. Our research meticulously investigated the influence of cylindrical vortex wakes on particle flow, agglomeration patterns, and the dynamics between fluids and particles. By employing a novel hybrid computational approach that integrates the discrete element method (DEM) with large Eddy simulation (LES), we were able to accurately simulate particle–particle interactions. The study focused on understanding how particles with different diameters (2, 5, 10, and 20 μm), densities (2,500, 5,000, 7,500, and 10,000 kg·m–3), and surface energies (0.01, 0.1, and 1 J·m–2) behaved within transitioning shear layer flow conditions. Our findings revealed that particles tended to congregate in areas of lower vorticity, with larger and denser particles demonstrating greater agglomeration efficiency due to their resilience against turbulent forces. Conversely, particles of lower density formed smaller agglomerates as their susceptibility to shear forces increased. Additionally, the study discovered that higher surface energies enhance adhesion, leading to the formation of larger agglomerates.

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来源期刊
ACS Omega
ACS Omega Chemical Engineering-General Chemical Engineering
CiteScore
6.60
自引率
4.90%
发文量
3945
审稿时长
2.4 months
期刊介绍: ACS Omega is an open-access global publication for scientific articles that describe new findings in chemistry and interfacing areas of science, without any perceived evaluation of immediate impact.
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