particle capture
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PLoS ONE ◽  
2021 ◽  
Vol 16 (12) ◽  
pp. e0261400
Author(s):  
Alexis Espinosa-Gayosso ◽  
Marco Ghisalberti ◽  
Jeff Shimeta ◽  
Gregory N. Ivey

Recent advances in understanding the capture of moving suspended particles in aquatic ecosystems have opened up new possibilities for predicting rates of suspension feeding, larval settlement, seagrass pollination and sediment removal. Drawing on results from both highly-resolved computational fluid dynamics (CFD) simulations and existing experimental data, we quantify the controlling influence of flow velocity, particle size and collector size on rates of contact between suspended particles and biological collectors over the parameter space characterising a diverse range of aquatic ecosystems. As distinct from assumptions in previous modeling studies, the functional relationships describing capture are highly variable. Contact rates can vary in opposing directions in response to changes in collector size, an organism’s size, the size of particles being intercepted (related to diet in the case of suspension feeders), and the flow strength. Contact rates shift from decreasing to increasing with collector diameter when particles become relatively large and there is vortex shedding in the collector wake. And in some ranges of the ecologically relevant parameter space, contact rates do not increase strongly with velocity or particle size. The understanding of these complex dependencies allows us to reformulate some hypotheses of selection pressure on the physiology and ecology of aquatic organisms. We discuss the benefits and limitations of CFD tools in predicting rates of particle capture in aquatic ecosystems. Finally, across the complete parameter space relevant to real aquatic ecosystems, all quantitative estimates of particle capture from our model are provided here.


2021 ◽  
Vol 104 (6) ◽  
Author(s):  
Mengying Wang ◽  
Julio M. Ottino ◽  
Richard M. Lueptow ◽  
Paul B. Umbanhowar

Author(s):  
Zhuo Chen ◽  
Jiahua Zhu ◽  
Yufeng Peng ◽  
Ji Li ◽  
Jing Ge

2021 ◽  
Author(s):  
Lauren Romita

<div>The use of microwells is popular for a wide range of applications due to its’ ease of use. However, the seeding of conventional microwells, which are closed at the bottom, is restricted to gravitational sedimentation for cell or particle deposition and therefore require lengthy settling times to maximize well occupancy. Microfluidics has accelerated cell or particle capture through flow but is mostly limited to gravitationally-driven settling for capture into the wells. An alternative approach to conventional closed-microwells, sieved microwells supersedes reliance on gravity by using hydrodynamic forces through the open pores at the bottom of the microwells to draw targets into the wells. The aim of this thesis is to develop a rapid and high-throughput fabrication method for sieved microwells and integrate the microwells into a double-layered microfluidic device to enable crossflow trapping. The resulting device achieves an 87% well occupancy in under 10 seconds.</div>


2021 ◽  
Author(s):  
Lauren Romita

<div>The use of microwells is popular for a wide range of applications due to its’ ease of use. However, the seeding of conventional microwells, which are closed at the bottom, is restricted to gravitational sedimentation for cell or particle deposition and therefore require lengthy settling times to maximize well occupancy. Microfluidics has accelerated cell or particle capture through flow but is mostly limited to gravitationally-driven settling for capture into the wells. An alternative approach to conventional closed-microwells, sieved microwells supersedes reliance on gravity by using hydrodynamic forces through the open pores at the bottom of the microwells to draw targets into the wells. The aim of this thesis is to develop a rapid and high-throughput fabrication method for sieved microwells and integrate the microwells into a double-layered microfluidic device to enable crossflow trapping. The resulting device achieves an 87% well occupancy in under 10 seconds.</div>


2021 ◽  
Vol 25 (11) ◽  
Author(s):  
Donatien Mottin ◽  
Florence Razan ◽  
Frédéric Kanoufi ◽  
Marie-Caroline Jullien

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