Article
Breakup length of AC electrified jets in a microfluidic flow‑focusing junction
Author/s | Castro Hernández, Elena De
![]() ![]() ![]() ![]() ![]() ![]() ![]() García Sánchez, Pablo ![]() ![]() ![]() ![]() ![]() ![]() ![]() Tan, Say Hwa Gañán-Calvo, Alfonso M. ![]() ![]() ![]() ![]() ![]() ![]() ![]() Baret, Jean-Christophe Ramos Reyes, Antonio ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
Department | Universidad de Sevilla. Departamento de Ingeniería Aeroespacial y Mecánica de Fluidos Universidad de Sevilla. Departamento de Electrónica y Electromagnetismo |
Publication Date | 2015-06 |
Deposit Date | 2022-06-06 |
Published in |
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Abstract | Electroactuation of liquid-liquid interfaces
offers promising methods to actively modulate droplet
formation in droplet-based microfluidic systems. Here,
flow-focusing junctions are coupled to electrodes to control
droplet ... Electroactuation of liquid-liquid interfaces offers promising methods to actively modulate droplet formation in droplet-based microfluidic systems. Here, flow-focusing junctions are coupled to electrodes to control droplet production in the well-known jetting regime. In this regime, a convective instability develops leading to droplet formation at the end of a thin and uniform, long liquid finger. We show that in AC electric fields the jet length is a function of both the magnitude of the applied voltage and the electrical parameters such as the frequency of the AC field and the conductivity of the dispersed phase.We explain that dependency using a simple transmission line model along the liquid jet. An optimum frequency to maximize the liquid ligament length is experimentally observed. Such length simply cannot be obtained by other means under the same operating conditions, in the absence of the AC signal. At low frequency, we reach a transition from a well-behaved, uniform jet brought about near the optimum frequency to highly unstable liquid structures in which axisymmetry is lost rather abruptly |
Funding agencies | European Research Council (ERC) Ministerio de Economía y Competitividad (MINECO). España Junta de Andalucía |
Project ID. | FP7/2007-2013 /ERC Grant Agreement 306385– SofI
![]() FIS2011-25161 ![]() P11-FQM -7919 ![]() |
Citation | Castro Hernández, E.D., García Sánchez, P., Tan, S.H., Gañán-Calvo, A.M., Baret, J. y Ramos Reyes, A. (2015). Breakup length of AC electrified jets in a microfluidic flow‑focusing junction. Microfluidics and Nanofluidics, 19 (4), 787-794. |
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