Please use this identifier to cite or link to this item: http://dx.doi.org/10.14279/depositonce-8450
Main Title: A flowing pair of particles in inertial microfluidics
Author(s): Schaaf, Christian
Rühle, Felix
Stark, Holger
Type: Article
Language Code: en
Abstract: A flowing pair of particles in inertial microfluidics gives important insights into understanding and controlling the collective dynamics of particles like cells or droplets in microfluidic devices. They are applied in medical cell analysis and engineering. We study the dynamics of a pair of solid particles flowing through a rectangular microchannel using lattice Boltzmann simulations. We determine the inertial lift force profiles as a function of the two particle positions, their axial distance, and the Reynolds number. Generally, the profiles strongly differ between particles leading and lagging in flow and the lift forces are enhanced due to the presence of a second particle. At small axial distances, they are determined by viscous forces, while inertial forces dominate at large separations. We identify cross-streamline pairs as stable fixed points in the lift force profiles and argue that same-streamline configurations are only one-sided stable. Depending on the initial conditions, the two-particle lift forces in combination with the Poiseuille flow give rise to three types of unbound particle trajectories, called moving-apart, passing, and swapping, and one type of bound trajectory, where the particles perform damped oscillations towards the cross-stream line configuration. The damping rate scales with Reynolds number squared, since inertial forces are responsible for driving the particles to their steady-state positions.
URI: https://depositonce.tu-berlin.de/handle/11303/9391
http://dx.doi.org/10.14279/depositonce-8450
Issue Date: 23-Jan-2019
Date Available: 30-Apr-2019
DDC Class: 530 Physik
Sponsor/Funder: DFG, 163436311, SFB 910: Kontrolle selbstorganisierender nichtlinearer Systeme: Theoretische Methoden und Anwendungskonzepte
TU Berlin, Open-Access-Mittel - 2019
License: https://creativecommons.org/licenses/by/3.0/
Journal Title: Soft Matter
Publisher: Royal Society of Chemistry
Publisher Place: Cambridge
Volume: 15
Issue: 9
Publisher DOI: 10.1039/C8SM02476F
Page Start: 1988
Page End: 1998
EISSN: 1744-6848
ISSN: 1744-683X
Appears in Collections:FG Statistische Physik weicher Materie und biologischer Systeme » Publications

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