Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session Q12: Drops: Electric Field Effects
12:50 PM–3:26 PM,
Tuesday, November 20, 2018
Georgia World Congress Center
Room: B217
Chair: Yuan-Nan Young, New Jersey Institute of Technology
Abstract ID: BAPS.2018.DFD.Q12.12
Abstract: Q12.00012 : Effects of surfactant transport on the electro-deformation of viscous drops
3:13 PM–3:26 PM
Presenter:
Herve Nganguia
(Indiana University of Pennsylvania)
Authors:
Herve Nganguia
(Indiana University of Pennsylvania)
On Shun Pak
(Santa Clara University)
Yuan-nan Young
(New Jersey Inst of Tech)
The mode of deformation, described by the flow circulation in a leaky dielectric drop, also contributes to the non-trivial deformation. For counter-clockwise circulation, we found leaky dielectric drops consistently yield larger deformation compared to perfectly conducting drops. The deformations result from the non-linear coupling between surfactant concentration and transport: higher surfactant concentrations yield larger (smaller) deformation with strong convective (diffusive) flows. For clockwise circulation, the deformation decreases (increases) with increasing surfactant concentration when convection (diffusion) dominates. We show that in this case conducting drops can yield larger deformations compared to leaky dielectric drops at moderate to high surfactant concentration. Finally, we look at the transient evolution of the drop shape, and discuss novel findings that have yet to be disseminated.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.Q12.12
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