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Particle capture by a circular cylinder in the vortex-shedding regime

Published online by Cambridge University Press:  19 September 2013

Alexis Espinosa-Gayosso ,
Marco Ghisalberti ,
Gregory N. Ivey  and
Nicole L. Jones
Alexis Espinosa-Gayosso*
Affiliation:
School of Environmental Systems Engineering, University of Western Australia, Crawley, WA 6009, Australia UWA Oceans Institute, University of Western Australia, Crawley, WA 6009, Australia
Marco Ghisalberti
Affiliation:
School of Environmental Systems Engineering, University of Western Australia, Crawley, WA 6009, Australia
Gregory N. Ivey
Affiliation:
School of Environmental Systems Engineering, University of Western Australia, Crawley, WA 6009, Australia UWA Oceans Institute, University of Western Australia, Crawley, WA 6009, Australia
Nicole L. Jones
Affiliation:
School of Environmental Systems Engineering, University of Western Australia, Crawley, WA 6009, Australia UWA Oceans Institute, University of Western Australia, Crawley, WA 6009, Australia
*
†Email address for correspondence: Alexis.Espinosa-Gayosso@uwa.edu.au
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Abstract

Particle capture, whereby suspended particles contact and adhere to a solid surface (a ‘collector’), is an important mechanism for a range of environmental processes including suspension feeding by corals and ‘filtering’ by aquatic vegetation. In this paper, we use two- and three-dimensional direct numerical simulations to quantify the capture efficiency ( $\eta $ ) of low-inertia particles by a circular cylindrical collector at intermediate Reynolds numbers in the vortex-shedding regime (i.e. for $47\lt \mathit{Re}\leq 1000$ , where $\mathit{Re}$ is the collector Reynolds number). We demonstrate that vortex shedding induces oscillations near the leading face of the collector which greatly affect the quantity and distribution of captured particles. Unlike in steady, low- $\mathit{Re}$ flow, particles directly upstream of the collector are not the most likely to be captured. Our results demonstrate the dependence of the time-averaged capture efficiency on $\mathit{Re}$ and particle size, improving the predictive capability for the capture of particles by aquatic collectors. The transition to theoretical high-Reynolds-number behaviour (i.e.  $\eta \sim {\mathit{Re}}^{1/ 2} $ ) is complex due to comparatively rapid changes in wake conditions in this Reynolds number range.

JFM classification

Biological Fluid Dynamics: Biological Fluid Dynamics Boundary Layers: Boundary layer structure

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Type
Papers
Information
Journal of Fluid Mechanics , Volume 733 , 25 October 2013 , pp. 171 - 188
Copyright
©2013 Cambridge University Press 

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