Details
| Original language | English |
|---|---|
| Article number | 115783 |
| Journal | Environmental research |
| Volume | 228 |
| Early online date | 5 Apr 2023 |
| Publication status | Published - 1 Jul 2023 |
Abstract
The settling velocities of 66 microplastic particle groups, having both regular (58) and irregular (eight) shapes, are measured experimentally. Regular shapes considered include: spheres, cylinders, disks, square plates, cubes, other cuboids (square and rectangular prisms), tetrahedrons, and fibers. The experiments generally consider Reynolds numbers greater than 10 2, extending the predominant range covered by previous studies. The present data is combined with an extensive data set from the literature, and the settling velocities are systematically analyzed on a shape-by-shape basis. Novel parameterizations and predictive drag coefficient formulations are developed for both regular and irregular particle shapes, properly accounting for preferential settling orientation. These are shown to be more accurate than the best existing predictive formulation from the literature. The developed method for predicting the settling velocity of irregularly-shaped microplastic particles is demonstrated to be equally well suited for natural sediments in the Appendix.
Keywords
- Microplastic particles, Non-buoyant, Settling velocity
ASJC Scopus subject areas
- Environmental Science(all)
- Biochemistry, Genetics and Molecular Biology(all)
- Biochemistry
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In: Environmental research, Vol. 228, 115783, 01.07.2023.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Settling velocity of microplastic particles having regular and irregular shapes
AU - Goral, Koray Deniz
AU - Guler, Hasan Gokhan
AU - Eltard Larsen, Bjarke
AU - Carstensen, Stefan
AU - Christensen, Erik Damgaard
AU - Kerpen, Nils B
AU - Schlurmann, Torsten
AU - Fuhrman, David R
N1 - Funding Information: This research has been financially supported by the Independent Research Fund Denmark project MPCOAST: MicroPlastic transport processes in the COASTal environment, grant no. 0136-00227B . The second author additionally acknowledges financial support from The Scientific and Technical Research Council of Turkey (TUBITAK) under the 2219 International Postdoctoral Research Fellowship Programme . This support is greatly appreciated.
PY - 2023/7/1
Y1 - 2023/7/1
N2 - The settling velocities of 66 microplastic particle groups, having both regular (58) and irregular (eight) shapes, are measured experimentally. Regular shapes considered include: spheres, cylinders, disks, square plates, cubes, other cuboids (square and rectangular prisms), tetrahedrons, and fibers. The experiments generally consider Reynolds numbers greater than 10 2, extending the predominant range covered by previous studies. The present data is combined with an extensive data set from the literature, and the settling velocities are systematically analyzed on a shape-by-shape basis. Novel parameterizations and predictive drag coefficient formulations are developed for both regular and irregular particle shapes, properly accounting for preferential settling orientation. These are shown to be more accurate than the best existing predictive formulation from the literature. The developed method for predicting the settling velocity of irregularly-shaped microplastic particles is demonstrated to be equally well suited for natural sediments in the Appendix.
AB - The settling velocities of 66 microplastic particle groups, having both regular (58) and irregular (eight) shapes, are measured experimentally. Regular shapes considered include: spheres, cylinders, disks, square plates, cubes, other cuboids (square and rectangular prisms), tetrahedrons, and fibers. The experiments generally consider Reynolds numbers greater than 10 2, extending the predominant range covered by previous studies. The present data is combined with an extensive data set from the literature, and the settling velocities are systematically analyzed on a shape-by-shape basis. Novel parameterizations and predictive drag coefficient formulations are developed for both regular and irregular particle shapes, properly accounting for preferential settling orientation. These are shown to be more accurate than the best existing predictive formulation from the literature. The developed method for predicting the settling velocity of irregularly-shaped microplastic particles is demonstrated to be equally well suited for natural sediments in the Appendix.
KW - Microplastic particles
KW - Non-buoyant
KW - Settling velocity
UR - http://www.scopus.com/inward/record.url?scp=85152093401&partnerID=8YFLogxK
U2 - 10.1016/j.envres.2023.115783
DO - 10.1016/j.envres.2023.115783
M3 - Article
C2 - 37028533
VL - 228
JO - Environmental research
JF - Environmental research
SN - 0013-9351
M1 - 115783
ER -