Session MN: Micro Fluids VI

8:00 AM–10:10 AM, Tuesday, November 25, 2008
Room: 201

Chair: Jonathan Posner, Arizona State University

Abstract ID: BAPS.2008.DFD.MN.4

Abstract: MN.00004 : Intrinsically Pulsating Electrohydrodynamic Cone-Jets

8:39 AM–8:52 AM

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  Menghan Chiang
    (Duke University)

  Shenren Xu
    (Duke University)

  Chuan-Hua Chen
    (Duke University)

When the flow rate of an electrohydrodynamic cone-jet is self-regulated, the jet typically pulsates intrinsically due to the imbalance between the liquid supplied to the cone and that discharged through the jet. We used high-speed microscopic imaging and oscilloscopic current measurements to characterize these intrinsic pulsations. The measured kHz-range pulsation frequency compares favorably to a model we developed drawing an analogy between pulsating cone-jet on a supported meniscus and that on an isolated charged drop. The scaling law is expected to be applicable to electrohydrodynamic drop formation and miniaturized electrospray systems.

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