Aggregation of Fibers by Waves

Verhille, Gautier; Gal, Patrice Le

doi:10.1007/978-3-319-78193-8_8

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…Under the assumption of negligibleṙ/r, where r is the radial coordinate of the particle, they carry our an order-of-magnitude analysis to show that the so-called oscillatory counter-centrifugation occurs for a given vortex pulsation threshold, which is function of the kinematic viscosity, the particle radius and the particleto-fluid density ratio. The results of Xu and Nadim [18], experimentally confirmed by [19] (who investigated the agglomeration of fiber particles in periodic flows), have been further generalized by Romanò [20], who showed that the Coriolis forces, responsible of reverting the centrifugation, lead to a rather more complex phenomenon termed Oscillatory Switching Centrifugation (OSC). In fact, Ref.…”

Section: Introductionmentioning

confidence: 78%

Particle Coherent Structures in Confined Oscillatory Switching Centrifugation

Romanò

2021

Crystals

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A small spherical rigid particle in a cylindrical cavity is considered. The harmonic rotation of the cavity wall drives the background flow characterized by the Strouhal number Str, assumed as the first parameter of our investigation. The particle immersed in the flow (assumed Stokesian) has a Stokes number St=1 and a particle-to-fluid density ratio ϱ which is assumed as the second parameter of this study. Building on the theoretical understanding of the recently discovered oscillatory switching centrifugation for inertial particles in unbounded flows, we investigate the effect of a confinement. For the first time we study how the presence of a wall affects the particle trajectory in oscillatory switching centrifugation dynamics. The emergence of two qualitatively different particle attractors is characterized for particles centrifuged towards the cavity wall. The implication of two such classes of attractors is discussed focusing on the application to microfluidics. We propose some strategies for exploiting the confined oscillatory switching centrifugation for selective particle segregation and for the enhancement of particle interaction events.

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Section: Introductionmentioning

confidence: 78%

Particle Coherent Structures in Confined Oscillatory Switching Centrifugation

Romanò

2021

Crystals

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“…However, it would be difficult to remove the balls without removing the stranded leaf litter, which is known to protect beaches against erosion 48 , provide nutrients for dune plants 29 and feed beach arthropod communities 49 . On the other hand, the dense outward shell of the EG 32,42 , the refractory character of their lignocellulosic fibers 50 and their low N content 51 provide them with a high stiffness and resistance to degradation. Thus, the probability of a plastic debris being disentangled and degraded and/or backwashed may be relatively low.…”

Section: Resultsmentioning

confidence: 99%

Seagrasses provide a novel ecosystem service by trapping marine plastics

Sánchez-Vidal

Canals

Haan

et al. 2021

Sci Rep

122

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There is strong evidence that the seafloor constitutes a final sink for plastics from land sources. There is also evidence that part of the plastics lying on the shallow seafloor are washed up back to the shoreline. However, little is known on the natural trapping processes leading to such landwards return. Here we investigate microplastics and larger plastic debris within beached seagrass remains including balls (aegagropilae) made of natural aggregates of vegetal fibers intertwined by seawater motion. We found up to 1470 plastic items per kg of plant material, which were mainly composed of negatively buoyant polymer filaments and fibers. Our findings show that seagrass meadows promote plastic debris trapping and aggregation with natural lignocellulosic fibers, which are then ejected and escape the coastal ocean. Our results show how seagrasses, one of the key ecosystems on Earth in terms of provision of goods and services, also counteract marine plastic pollution. In view of our findings, the regression of seagrass meadows in some marine regions acquires a new dimension.

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Aggregation of Fibers by Waves

Cited by 2 publications

References 5 publications

Particle Coherent Structures in Confined Oscillatory Switching Centrifugation

Particle Coherent Structures in Confined Oscillatory Switching Centrifugation

Seagrasses provide a novel ecosystem service by trapping marine plastics

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