Electrical discharge in capillary break-up: controlling the charge of a droplet

Jean-Christophe Baret, Friedrich Gunther Mugele

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Abstract

We studied the detachment of sessile droplets of conductive liquids from an immersed wire by reducing the contact angle using ac electrowetting. Upon detachment, the droplets acquire a certain amount of charge, which is shown to be controlled by a dimensionless parameter alpha. alpha describes the interplay between the diverging Ohmic resistance of the breaking capillary neck and the ac frequency. In the specific configuration of the present experiment, discharging at high frequency leads to self-excited oscillations in which the droplets periodically detach from and reattach to the wire.
Original languageUndefined
Pages (from-to)016106-
JournalPhysical review letters
Volume96
Issue number1
DOIs
Publication statusPublished - 2006

Keywords

  • IR-57956
  • METIS-232831

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