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.Q12.1
Abstract: Q12.00001 : Double emulsion droplet breakup under DC electric field*
12:50 PM–1:03 PM
(Korea Advanced Institute of Science and Technology)
Muhammad Salman Abbasi
We studied experimentally, theoretically, and numerically how electrohydrodynamic deformation and breakup of double emulsion droplets occurs under DC electric field. Experiments show that there are four distinct modes of breakup depending on the viscosity ratio, electrical conductivity ratio, permittivity ratio, and volume ratio of the core to shell liquid. The breakup modes are classified such as a unidirectional breakup mode, two different bidirectional breakup modes, and a tip-streaming breakup mode. In order to investigate the dynamics of core droplet migration and the thin film drainage of shell liquid, theoretical studies are performed aided by numerical simulation. For droplet breakup, sufficiently large Maxwell stresses (∼εE2) are essential in comparison with the capillary pressure (∼γ/rc) of the core. During breakup, the Plateau’s criteria and geometry effect are critical factor determining the breakup modes. We believe that this study could provide impacts for the comprehension of double emulsion droplet functionalities in various applications including drug delivery, material science, biological and chemical engineering.
*This work was supported by the National Research Foundation of Korea (NRF) (2017R1A2B2006964).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.Q12.1
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