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  AC electrified jets in a flow-focusing device: Jet length scaling.

Castro-Hernández, E., García-Sánchez, P., Alzaga-Gimeno, J., Tan, S. H., Baret, J.-C., & Ramos, A. (2016). AC electrified jets in a flow-focusing device: Jet length scaling. Biomicrofluidics, 10(4): 043504. doi:10.1063/1.4954194.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-9774-5 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-3D58-7
Genre: Journal Article

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http://aip.scitation.org/doi/10.1063/1.4954194 (Publisher version)
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 Creators:
Castro-Hernández, E., Author
García-Sánchez, P., Author
Alzaga-Gimeno, J., Author
Tan, S. H., Author
Baret, Jean-Christophe1, Author              
Ramos, AA., Author
Affiliations:
1Group Micro- and nanostructures in two-phase fluids, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063302              

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Free keywords: Fluid jets; Fluid drops; Electric fields; Electrodes; Convection currents
 Abstract: We use a microfluidic flow-focusing device with integrated electrodes for controlling the production of water-in-oil drops. In a previous work, we reported that very long jets can be formed upon application of AC fields. We now study in detail the appearance of the long jets as a function of the electrical parameters, i.e., water conductivity, signal frequency, and voltage amplitude. For intermediate frequencies, we find a threshold voltage above which the jet length rapidly increases. Interestingly, this abrupt transition vanishes for high frequencies of the signal and the jet length grows smoothly with voltage. For frequencies below a threshold value, we previously reported a transition from a well-behaved uniform jet to highly unstable liquid structures in which axisymmetry is lost rather abruptly. These liquid filaments eventually break into droplets of different sizes. In this work, we characterize this transition with a diagram as a function of voltage and liquid conductivity. The electrical response of the long jets was studied via a distributed element circuit model. The model allows us to estimate the electric potential at the tip of the jet revealing that, for any combination of the electrical parameters, the breakup of the jet occurs at a critical value of this potential. We show that this voltage is around 550 V for our device geometry and choice of flow rates.

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Language(s): eng - English
 Dates: 2016-06-152016-07
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1063/1.4954194
 Degree: -

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Title: Biomicrofluidics
Source Genre: Journal
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Publ. Info: -
Pages: 11 Volume / Issue: 10 (4) Sequence Number: 043504 Start / End Page: - Identifier: -