Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session ZC20: Drops: Impact on Liquids
12:50 PM–3:00 PM,
Tuesday, November 21, 2023
Room: 146C
Chair: Isaac Jackiw, Massachusetts Institute of Technology
Abstract: ZC20.00010 : Capillary retraction of a slender fiber into a driven and confined microfluidic droplet*
2:47 PM–3:00 PM
Presenter:
Grégoire CLEMENT
(ESPCI)
Authors:
Grégoire CLEMENT
(ESPCI)
Matthieu Labousse
(ESPCI)
Joshua D McGraw
(ESPCI Paris)
This study therefore aims to explore a visco-elasto-capillary relaxation starting from a model non-equilibrium state. For this purpose, the dynamic retraction of a slender fiber into a moving droplet was observed. We have experimentally witnessed such a phenomenon in droplet/fiber pairs prepared in biphasic microfluidic devices under pressure-driven flow. We observed two distinct dynamics depending on the sense of retraction of the fiber compared to the direction of the external-phase flow, and depending on the relative viscosity of the droplet and external phases. Using a minimal model considering an energy balance between the surface energy of the fiber and viscous dissipation, the observed capillary retraction dynamics can be described.
*The authors benefited from the financial support of the Agence Nationale de la Recherche (ANR) under grants of the of the Institut Pierre-Gilles de Gennes (Equipex ANR-10-EQPX-34 and Labex ANR-10-LABX-31), and PSL Research University (Idex ANR-10-IDEX-0001-02), along with funding from PSL-QLife Pre-Maturation and Maturation grants.
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