4.8 Article

Selective Spreading and Jetting of Electrically Driven Dielectric Films

Journal

PHYSICAL REVIEW LETTERS
Volume 107, Issue 3, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.034502

Keywords

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Funding

  1. NRF of Korea [NRF-2009-352-D00034]
  2. ARO MURI [W911NF-09-1-0476]

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We study the electrically driven spreading of dielectric liquid films in wedge-shaped gaps across which a potential difference is applied. Our experiments are in a little-studied regime where, throughout the dynamics, the electrical relaxation time is long compared to the time for charge to be convected by the fluid motion. We observe that at a critical normal electric field the hump-shaped leading edge undergoes an instability in the form of a single Taylor cone and periodic jetting ensues, after which traveling waves occur along the trailing thin film. We propose a convection-dominated mechanism for charge transport to describe the observed dynamics and rationalize the viscosity dependence of the self-excited dynamics.

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