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

    Author(s)
    Castro-Hernandez, Elena
    Garcia-Sanchez, Pablo
    Alzaga-Gimeno, Javier
    Tan, Say Hwa
    Baret, Jean-Christophe
    Ramos, Antonio
    Griffith University Author(s)
    Tan, Say Hwa H.
    Year published
    2016
    Metadata
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    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 ...
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    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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    Journal Title
    Biomicrofluidics
    Volume
    10
    DOI
    https://doi.org/10.1063/1.4954194
    Subject
    Classical physics
    Fluid mechanics and thermal engineering
    Other engineering
    Nanotechnology
    Publication URI
    http://hdl.handle.net/10072/124029
    Collection
    • Journal articles

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