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Pulsating electrohydrodynamic cone-jets: from choked jet to oscillating cone

Published online by Cambridge University Press:  14 November 2011

David B. Bober  and
Chuan-Hua Chen
David B. Bober
Affiliation:
Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27708, USA
Chuan-Hua Chen*
Affiliation:
Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27708, USA
*
†Email address for correspondence: [email protected]
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Abstract

Pulsating cone-jets occur in a variety of electrostatic spraying and printing systems. This paper reports an experimental study of the pulsation frequency to reconcile two models based on a choked jet and an oscillating cone, respectively. The two regimes are demarcated by the ratio of the supplied flow rate () to the minimum flow rate () required for a steady Taylor cone-jet. When , the electrohydrodynamic flow is choked at the nozzle because the intermittent jet, when on, emits mass at the minimum flow rate; the pulsation frequency in the choked jet regime is proportional to . When , the Taylor cone anchored at the nozzle experiences a capillary oscillation analogous to the Rayleigh mode of a free drop; the pulsation frequency in the oscillating cone regime plateaus to the capillary oscillation frequency, which is independent of .

JFM classification

Drops and Bubbles: Electrohydrodynamic effects
Type
Papers
Information
Journal of Fluid Mechanics , Volume 689 , 25 December 2011 , pp. 552 - 563
Copyright
Copyright © Cambridge University Press 2011

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