Oscillations of confined fibres transported in microchannels

We investigate the trajectories of rigid fibres as they are transported in a pressure-driven flow, at low Reynolds number, in shallow Hele-Shaw cells. The transverse confinement and the resulting viscous friction on these elongated objects, as well as the lateral confinement (i.e. the presence of la...

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Bibliographic Details
Published in:Journal of fluid mechanics 2018-01, Vol.835, p.444-470
Main Authors: Nagel, M., Brun, P.-T., Berthet, H., Lindner, A., Gallaire, F., Duprat, C.
Format: Article
Language:English
Subjects:
Confinement
Elongation
Experiments
Fibers
Fluid dynamics
Fluid flow
Fluids
JFM Papers
Mathematical models
Microchannels
Oscillations
Reynolds number
Sedimentation & deposition
State (computer science)
Studies
Trajectories
Velocity
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Summary:We investigate the trajectories of rigid fibres as they are transported in a pressure-driven flow, at low Reynolds number, in shallow Hele-Shaw cells. The transverse confinement and the resulting viscous friction on these elongated objects, as well as the lateral confinement (i.e. the presence of lateral walls), lead to complex fibre trajectories that we characterize with a combination of microfluidic experiments and simulations using modified Brinkman equations. We show that the transported fibre behaves as an oscillator for which we obtain and analyse a complete state diagram.
ISSN:0022-1120
1469-7645
DOI:10.1017/jfm.2017.662