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- W2941882160 abstract "In this thesis, I study the collective behavior and self-organization of immiscible siliconeoil drops in a castor oil medium. Castor oil is a “leaky dielectric” and the siliconeoil drops interact with each other due to electrohydrodynamic forces induced by animposed electric field. The strength and the range of the hydrodynamic interactionsare modulated by changing amplitude and frequency of the electric field, respectively,in a small capacitor.The result of the electrohydrodynamic forces is to induce flows that induce dropmotions, deformations and breakup. I study the effect of cell thickness, d, on the sizedistribution and dynamics of silicone oil drops in presence of an external DC electricfield. I also investigate the effect of dimensionality by varying the cell thickness, d, andobservation of drop dynamics as well as the observation of an electrohydrodynamicallydriven convective instability. For the first time, to our knowledge, two-roll structures,with a lateral size that is half the cell thickness, are observed experimentally. Further,this instability is also seen in castor oil medium, in the absence of any liquid-liquidand solid-liquid interfaces, indicating the importance of electrokinetic effects.Next, I constrain the motion of silicone oil drops in 2D, using dielectrophoretictraps, in order to create a 2D droplet crystal. By driving this crystal with frequencytunableelectrohydrodynamic forces, I construct a amplitude-frequency phase diagramfor the non-equilibrium order to disorder phase transition of silicone oil drops in castor oil medium. The pure order-to-disorder behaviour is observed for a amplitudefrequencyregime where no breakup events occur but the hydrodynamic flows arestrong enough to deform and partially unpin the droplets from their trap potential.Finally, an examination of the underlying flows using tracer particles revealsanomalous superdiffusive motion with power law scaling of t3/2. The underlying probabilitydistribution for these anomalous motions is non-Gaussian and has the formexp(-( x2 )δ/2 4Kγt3/2At short times, it is a simple exponential decay (i.e. δ = 1),while at longer times the distribution is consistent with δ = 1.4.This system exhibits non-equilibrium self-organization that is frequency- andamplitude-tunable, that will not only allow more detailed comparisons with detailedtheory and simulation in the future. Moreover, it has been demonstrated as a modelsystem for studying self-organization with tunable hydrodynamic interactions." @default.
- W2941882160 created "2019-05-03" @default.
- W2941882160 creator A5051674652 @default.
- W2941882160 date "2018-07-13" @default.
- W2941882160 modified "2023-09-27" @default.
- W2941882160 title "Electrohydrodynamics: a study of collectivebehavior and self-organization of an oil-in-oilemulsion" @default.
- W2941882160 hasPublicationYear "2018" @default.
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