Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session A36: Suspensions: Confined Flows
8:00 AM–9:57 AM,
Sunday, November 18, 2018
Georgia World Congress Center
Room: B408
Chair: Roseanna Zia, Stanford University
Abstract ID: BAPS.2018.DFD.A36.1
Abstract: A36.00001 : Universal behavior of mirror-symmetric particles in confined Stokes flow*
8:00 AM–8:13 AM
Presenter:
Rumen Nikolaev Georgiev
(Delft University of Technology)
Authors:
Rumen Nikolaev Georgiev
(Delft University of Technology)
Bram Bet
(Utrecht University)
Sela Samin
(Utrecht University)
William E Uspal
(Max Planck Institute for Intelligent Systems, Max Planck Institute for Intelligent Systems)
Rene van Roij
(Utrecht University)
Burak Eral
(Delft University of Technology)
Deeper understanding of particle motion in microfluidic devices would unlock novel technologies for continuous, high throughput separation of distinctly-shaped particles such as cells and crystal polymorphs. Particles interact hydrodynamically with each other or with confining walls, thus altering their trajectory. These hydrodynamic interactions strongly depend on particle shape and can be tuned to guide a particle along a specific path. We focus on particles with a single mirror plane, produced via stop flow lithography in a shallow, quasi-2D microfluidic channel. A particle lags the surrounding flow due to strong confinement from the horizontal channel walls. Regardless of their exact shape, all studied particles have identical modes of motion: exponentially-decaying in-plane rotation and cross-streamline migration along a bell-shaped path. Both modes are characterized by timescales, unique to a particle’s geometry. Scaling rotation and translation of all considered shapes by their respective timescales, yields a single trajectory, universal to mirror-symmetric particles. We propose a minimalistic qualitative model capable of predicting the trajectory of various particles with one mirror plane in a shallow microfluidic flow.
*HBE acknowledges funding from NWO Veni program.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.A36.1
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