Session D20: Focus Session: Microfluidics and Nanofluidics III - Pattern Formation and Droplets

2:30 PM–5:30 PM, Monday, March 3, 2014
Room: 405

Sponsoring Units: DPOLY DFD GSNP
Chair: John Royer, NIST

Abstract ID: BAPS.2014.MAR.D20.1

Abstract: D20.00001 : Whipping of electrified jets

2:30 PM–3:06 PM

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  Alberto Fernandez-Nieves
    (Physics. Georgia Tech)

Whipping is a non-axisymmetric instability characteristic of electrified jets. It is exploited in electrospinning to reduce the average diameter of the fibers that result in this process. In air, it usually manifests in a chaotic fashion and thus, its structure and properties have been hard to quantify experimentally. We show that by applying electric fields to coflowing liquids, we can generate steady-state whipping structures. This allows for a detailed characterization of this non-axisymmetric instability. In addition, we will also discuss other emission regimes not typically seen in electrospray.

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