期刊
MARINE POLLUTION BULLETIN
卷 176, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2022.113449
关键词
Microplastics; Terminal settling velocity; Drag coefficient; Sphericity; Non-spherical particles; Particle Reynolds number
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- China Scholarship Council (CSC) [202006240062]
In this study, the settling process of microplastic particles in water bodies was investigated, and a new formula for the drag coefficient and settling velocity of microplastic particles was developed. The new formula showed smaller errors and improved accuracy in predicting the motion behavior of microplastics.
Microplastic (MP) settling process is important for the transport of microplastic particles (MPs, < 5 mm) in water bodies. However, for the control parameter of the drag coefficient (C-d), no generalized formula has been pro-posed for MPs of different shapes and materials. In this study, a total of 1343 MP settling data were collected from the literature. It was found that the drag law for perfect spheres cannot reasonably predict C-d for MPs with particle Reynolds number of 1-10(3). A new formula for C-d was developed by introducing the dimensionless particle diameter (d(*)) and two shape descriptors. The absolute error of the new formula is 15.2%, smaller than those (42.5-72.8%) of other existing formulas. Moreover, an explicit model was developed for MP settling velocity by correlating C-d, d(*), and shape descriptors, with lower absolute error (8.8%) than those (15.4-77.2%) of existing models.
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