| Issue |
EPL
Volume 119, Number 6, September 2017
|
|
|---|---|---|
| Article Number | 64003 | |
| Number of page(s) | 7 | |
| Section | Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics | |
| DOI | https://doi.org/10.1209/0295-5075/119/64003 | |
| Published online | 14 December 2017 | |
Migration reversal of soft particles in vertical flows
Theoretische Physik I, Universität Bayreuth - 95440 Bayreuth, Germany
Received: 13 June 2017
Accepted: 13 November 2017
Non-neutrally buoyant soft particles in vertical microflows are investigated. We find for light soft particles in downward Poiseuille flow cross-streamline migration (CSM) to off-center streamlines and for heavy particles CSM to the center. In both cases a reversal of the vertical flow direction and the related shear gradient causes a reversal of the migration direction. This gravitational driven CSM of soft particles occurs also in linear shear flows: heavy (light) particles migrate antiparallel (parallel) to the shear gradient. The surprising, flow-induced migration (reversal) is characterized by simulations and analytical approximations, confirming our plausible explanation of the effect. This might be applied for separating particles.
PACS: 47.57.ef – Sedimentation and migration / 83.50.-v – Deformation and flow / 47.15.G- – Low-Reynolds-number (creeping) flows
© EPLA, 2017
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