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  Breakup length of AC electrified jets in a microfluidic flow-focusing junction

Castro-Hernández, E., Garćia-Sánchez, P., Tan, S. H., Gañán-Calvo, A. M., Baret, J.-C., & Ramos, A. (2015). Breakup length of AC electrified jets in a microfluidic flow-focusing junction. Microfluidics and Nanofluidics, 19(4), 787-794. doi:10.1007/s10404-015-1603-3.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-398F-3 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-E324-4
Genre: Journal Article

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 Creators:
Castro-Hernández, E., Author
Garćia-Sánchez, P., Author
Tan, Say Hwa1, Author              
Gañán-Calvo, A. M., Author
Baret, Jean-Christophe1, Author              
Ramos, A., Author              
Affiliations:
1Max Planck Research Group Droplets, Membranes and Interfaces, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063290              

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Free keywords: AC electric field; Flow focusing; Microfluidics; Jet
 Abstract: Electroactuation of liquid–liquid interfaces offers promising methods to actively modulate droplet for - mation 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 drop - let 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 maxi - mize 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.

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Language(s): eng - English
 Dates: 2015-06-072015-10
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: BibTex Citekey: castro_MiNa_2015
DOI: 10.1007/s10404-015-1603-3
 Degree: -

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Title: Microfluidics and Nanofluidics
Source Genre: Journal
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Publ. Info: -
Pages: - Volume / Issue: 19 (4) Sequence Number: - Start / End Page: 787 - 794 Identifier: ISSN: 1613-4982