Numerical simulation and experimental study of microplastic transport under open channel shear flow: Roles of particle physical properties and flow velocities

IF 6.2 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Ecotoxicology and Environmental Safety Pub Date : 2024-11-15 DOI:10.1016/j.ecoenv.2024.117308

Lulu He , Jianhao Jiang , Shiwei Zheng , Nazhen Yu , Yan Zhu , Wei Han

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Abstract

Microplastic (MP) transport patterns under open channel shear flow remain unclear. This study investigates the transport laws of MPs at various flow velocities, MP densities, sizes and concentrations in the U-shaped experimental flume and the numerical flume based on Lattice Boltzmann Method (LBM). The results indicate that the average horizontal particle velocity and the transport distances of Polyvinyl chloride (PVC) and Polystyrene (PS) particles increase with the average cross-sectional flow velocity, while the average vertical particle velocity decreases with it. The total average particle velocity closely matches the average vertical particle velocity, regardless of the variation in MP size, density and concentration. Formula-based analysis reveals that the acceleration of spherical MP transport mainly depends on the particle size and its consequent relative drag force term (RDFT) under the conditions with a single type of MP particles, but on the particle density and its consequent RDFT and relative gravity term (RGT) in the case concerning different types of MP particles with identical particle sizes. The average horizontal particle velocity maximum of PVC and PS are both strongly correlated with the average flow velocity maximum in the cross-section. This correlation lowers with the MP particle size and concentration, and is independent of MP density. Our findings can provide reference for the prevention and control of MP pollution in rivers.

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明渠剪切流下微塑料迁移的数值模拟和实验研究：颗粒物理性质和流速的作用。

明渠剪切流下的微塑料（MP）输运模式仍不清楚。本研究在 U 型实验水槽和基于晶格玻尔兹曼法（LBM）的数值水槽中研究了不同流速、不同密度、尺寸和浓度的微塑料（MP）的输运规律。结果表明，聚氯乙烯（PVC）和聚苯乙烯（PS）颗粒的平均水平流速和传输距离随平均横截面流速的增加而增加，而平均垂直颗粒流速则随之减小。无论聚氯乙烯（PVC）和聚苯乙烯（PS）颗粒的尺寸、密度和浓度如何变化，颗粒的总平均速度都与颗粒的平均垂直速度密切相关。基于公式的分析表明，在单一类型 MP 颗粒的条件下，球形 MP 的传输加速度主要取决于颗粒大小及其随之产生的相对阻力项（RDFT），而在颗粒大小相同的不同类型 MP 颗粒的条件下，则取决于颗粒密度及其随之产生的相对阻力项和相对重力项（RGT）。PVC 和 PS 的平均水平颗粒速度最大值与横截面上的平均流速最大值密切相关。这种相关性随着 MP 颗粒大小和浓度的增加而降低，与 MP 密度无关。我们的研究结果可为河流中 MP 污染的防治提供参考。

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

Ecotoxicology and Environmental Safety 环境科学-毒理学

CiteScore

12.10

自引率

5.90%

发文量

1234

审稿时长

88 days

期刊介绍： Ecotoxicology and Environmental Safety is a multi-disciplinary journal that focuses on understanding the exposure and effects of environmental contamination on organisms including human health. The scope of the journal covers three main themes. The topics within these themes, indicated below, include (but are not limited to) the following: Ecotoxicology、Environmental Chemistry、Environmental Safety etc.