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Settling Behaviors of Microplastic Disks in the Acceleration Processes in Stagnant Water
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This IAHR-affiliated study examined the settling behavior of disk-shaped microplastic particles in the acceleration phase in stagnant water, contributing experimental data on the hydrodynamics of non-spherical plastic particles in freshwater environments. Understanding how different microplastic shapes sink is essential for modeling their transport and deposition in rivers and lakes.
The International Association for Hydro-Environment Engineering and Research (IAHR), founded in 1935, is a worldwide independent organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application.
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Settling behaviors of microplastic disks in acceleration fall
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Researchers studied the settling behavior of disk-shaped microplastics during free-fall in water, using high-speed imaging to track the orientation and velocity of particles as they descended. Disk-shaped particles exhibited oscillating and tumbling motions that slowed settling compared to spheres of equivalent mass, with implications for predicting microplastic transport and deposition in aquatic environments.
Evaluation of the Effects of Particle Characteristics on the Terminal Settling Velocities of Microplastics in Stagnant Waters using CFD
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This study used computational fluid dynamics to simulate the terminal settling velocities of microplastic particles with different shapes, sizes, and densities in still water. Results showed that particle shape, particularly deviation from a sphere, significantly affects how fast microplastics sink in aquatic systems.
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Researchers conducted experiments to study how irregularly shaped microplastic particles settle under both steady and turbulent water flow conditions, finding that shape significantly affects sinking rates in ways not captured by models designed for spherical particles. Improved understanding of how real-world plastic particle shapes affect transport is needed for accurate environmental fate modeling.
Settling velocity of irregularly shaped microplastics under steady and dynamic flow conditions
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The settling velocities of irregularly shaped microplastics were measured under both still water and dynamic flow conditions, finding that shape strongly affected settling speed and that turbulence caused non-spherical particles to orient and settle differently than spheres, with implications for predicting microplastic vertical transport in rivers and coastal waters.
Empirical Shape-Based Estimation of Settling Microplastic Particles Drag Coefficient
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This study experimentally measured the settling behavior of flat square microplastic particles in water, finding that shape significantly affects sinking speed and drag compared to spherical particles. Understanding how microplastic shapes influence settling is essential for modeling where plastics accumulate in rivers and ocean sediments.
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