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Experimental study of the settling characteristics of spherical microplastics under oscillating grid turbulence
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Researchers measured the settling velocities of microplastics ranging from 50 to 5000 μm under laboratory-generated oscillating grid turbulence across roughly 6,000 samples, finding that turbulence reduces median settling speed with a minimum at moderate intensities, that velocity distributions become skewed under strong turbulence, and deriving a predictive formula with R² of 0.998.
The settling process of microplastics plays a key role in their fate in marine environments. However, the settling characteristics of microplastics in turbulent environments have not been fully elucidated. In response to this problem, the settling characteristics of microplastics (50-5000 μm) under turbulence were analyzed using an oscillating grid and a total of approximately 6000 samples. The results show that the average settling velocity of microplastics under identical turbulence is not deterministic and varies within a range because of the randomness of the occurrence of turbulent mechanisms. The fluctuation range of the settling velocities of the microplastics increases with increasing turbulent shear rate and decreases with increasing diameter. Microplastics' settling velocity follows a skewed distribution under relatively strong turbulence, leading to the proposal of median settling velocity. Turbulence reduces microplastics' median settling velocity, with the minimum occurring at relatively moderate turbulence. Turbulence mechanism occurrence depends on microplastic-turbulence coupling; relative turbulence intensity is an effective indicator. A new explicit formula for predicting median settling velocities was proposed whose R was 0.998. This study can improve the accuracy of predicting microplastic fate, thereby providing reference data for the assessment and efficient treatment of microplastic pollution.
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Using controlled flume experiments, researchers studied how turbulent flow conditions affect the transport and settling behavior of microplastic particles with varied shapes and densities, finding that turbulence intensity and particle morphology interacted to determine suspension and deposition patterns.
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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.
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Researchers studied how microplastic particles settle in turbulent river-like flow conditions compared to still water and developed a new formula to predict their behavior. They found that turbulence altered settling velocities by as much as 26% depending on particle properties, with larger, heavier particles being less influenced by water turbulence. The findings are important for building better models of how microplastics are transported and distributed in rivers and other flowing waterways.
Sedimentation of Irregular Shaped Microplastics Under Steady and Dynamic Flow Conditions
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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.
Experimental Investigation of Settling Velocity of Spherical Microplastic Particles
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This experimental study measured the settling velocities of spherical microplastic particles in water, finding that the behavior of microplastics deviates from predictions based on natural sediment particles due to their lower density and shape. Accurate settling velocity data is essential for modeling how microplastics distribute through water columns and where they accumulate in aquatic environments.
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