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Electrohydrodynamics of particle-covered drops

Published online by Cambridge University Press:  16 June 2014

Malika Ouriemi  and
Petia M. Vlahovska
Malika Ouriemi*
Affiliation:
School of Engineering, Brown University, Providence, RI 02906, USA
Petia M. Vlahovska
Affiliation:
School of Engineering, Brown University, Providence, RI 02906, USA
*
†Permanent address: IFPEN, Solaize, BP 3, 69360, France. Email address for correspondence: malika.ouriemi@ifpen.fr
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Abstract

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We experimentally investigate the effect of surface-absorbed colloidal particles on the dynamics of a leaky dielectric drop in a uniform DC electric field. Depending on the particle polarizabilty, coverage and the electrical field intensity, particles assemble into various patterns such as an equatorial belt, pole-to-pole chains or a band of dynamic vortices. The particle structuring changes droplet electrohydrodynamics: under the same conditions where a particle-free drop would be a steady oblate spheroid, the belt can give rise to unsteady behaviours such as sustained drop wobbling or tumbling. Moreover, particle chaining can be accompanied by prolate drop deformation and tip-streaming.

JFM classification

Complex Fluids: Colloids Drops and Bubbles: Drops
Type
Papers
Information
Journal of Fluid Mechanics , Volume 751 , 25 July 2014 , pp. 106 - 120
Copyright
© 2014 Cambridge University Press 

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Ouriemi et al. supplementary material

Belt formation by Polyethylene (Pe) spheres. Coverage=35%. Ca=0.18

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Video 1.9 MB
Supplementary material: PDF

Ouriemi et al. supplementary material

Supplementary figures

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Ouriemi et al. supplementary material

Belt destabilization and formation of a dynamic sinusoid by Polyethylene (Pe) particles. Coverage=35%. Ca=1.36

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Video 1.6 MB

Ouriemi et al. supplementary material

Wobbling of a drop covered with aluminum (Al) particles. Coverage=48%. Ca=3.43

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Video 1.1 MB

Ouriemi et al. supplementary material

Tumbling of a drop covered with aluminum (Al) particles. Coverage=48%. Ca=3.74

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Video 1.1 MB

Ouriemi et al. supplementary material

Drum-like shape deformation of a drop covered with glass (G) particles. Coverage=91%. Ca=1.83

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Video 1.3 MB

Ouriemi et al. supplementary material

Drum-like shape deformation and implosion of a drop covered with glass (G) particles. Coverage=91%. Ca=2.62

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Video 1.2 MB

Ouriemi et al. supplementary material

Drum-like shape deformation and implosion of a drop covered with aluminum (Al) particles. Coverage=48%. Ca=5.84

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Video 519.4 KB