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research article

Interface-induced recirculation within a stationary microfluidic drop

Lee, Sungyon
•
Gallaire, Francois  
•
Baroud, Charles N.
2012
Soft Matter

We study the flow within a stationary drop in a Hele-Shaw cell. The experiments are performed in a microfluidic channel, whose surface is patterned with a single hole that serves to anchor the drop while the outer fluid continues to flow. The recirculation pattern is found to be localized near the liquid-liquid interface for all conditions, with most of the fluid motion taking place in the curved rim of the droplet. In contrast, the drop's central region remains nearly stationary. This flow pattern corresponds to a three-dimensional recirculation on the drop surface, with the fluid moving in the direction of the outer flow on the central plane and in the opposite direction closer to the boundaries. The different velocities scale linearly with the outer fluid velocity for all geometries studied. However, the velocity on the interface is found to be lower than the driving velocity even in the case of a gas bubble, pointing to the effect of surface stresses as the underlying retardation and recirculation mechanism. This motivates the development of a Marangoni model to account for the surfactant accumulation around the downstream stagnation point. The model displays good qualitative agreement with the experimental observations for many viscosity ratios and geometries but for a well-chosen surfactant accumulation.

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Type
research article
DOI
10.1039/c2sm26044a
Web of Science ID

WOS:000310829300026

Author(s)
Lee, Sungyon
Gallaire, Francois  
Baroud, Charles N.
Date Issued

2012

Publisher

Royal Society of Chemistry

Published in
Soft Matter
Volume

8

Issue

41

Start page

10750

End page

10758

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LFMI  
Available on Infoscience
February 27, 2013
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/89863
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