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The effects of electrostatic forces on the distribution of drops in a channel flow: Two-dimensional oblate drops

dc.contributor.authorFernández, Arturoen_US
dc.contributor.authorTryggvason, Gretaren_US
dc.contributor.authorChe, Judyen_US
dc.contributor.authorCeccio, Steven L.en_US
dc.date.accessioned2011-11-15T15:57:42Z
dc.date.available2011-11-15T15:57:42Z
dc.date.issued2005-09en_US
dc.identifier.citationFernández, Arturo; Tryggvason, Gretar; Che, Judy; Ceccio, Steven L. (2005). "The effects of electrostatic forces on the distribution of drops in a channel flow: Two-dimensional oblate drops." Physics of Fluids 17(9): 093302-093302-15. <http://hdl.handle.net/2027.42/87286>en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/87286
dc.description.abstractNumerical simulations are used to examine the effect of an electrostatic field on an emulsion of drops in a channel. The leaky-dielectric theory of Taylor is used to find the electric field, the charge distribution on the drop surface, and the resulting forces. The Navier-Stokes equations are solved using a front-tracking/finite-volume technique. Depending on the ratios of conductivity and permittivity of the drop fluid and the suspending fluid the drops can become oblate or prolate. In addition to normal forces that deform the drops, tangential forces can induce a fluid motion either from the poles of the drops to their equator or from the equator to the poles. In this paper we focus on oblate drops, where both the dielectrophoretic and the electrohydrodynamic interactions of the drops work together to “fibrate” the emulsion by lining the drops up into columns parallel to the electric field. When the flow through the channel is slow, the fibers can extend from one wall to the other. As the flow rate is increased the fibers are broken up and drops accumulate at the channel walls. For high enough flow rate, when the drop interactions are dominated by the fluid shear, the drops remain in suspension. Only two-dimensional systems are examined here, but the method can be used for fully three-dimensional systems as well.en_US
dc.publisherThe American Institute of Physicsen_US
dc.rights© The American Institute of Physicsen_US
dc.titleThe effects of electrostatic forces on the distribution of drops in a channel flow: Two-dimensional oblate dropsen_US
dc.typeArticleen_US
dc.subject.hlbsecondlevelPhysicsen_US
dc.subject.hlbtoplevelScienceen_US
dc.description.peerreviewedPeer Revieweden_US
dc.contributor.affiliationumDepartment of Mechanical Engineering and Applied Mechanics. University of Michigan, Ann Arbor, Michigan 48109en_US
dc.contributor.affiliationotherDepartment of Mechanical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, Massachusetts 01609en_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/87286/2/093302_1.pdf
dc.identifier.doi10.1063/1.2043147en_US
dc.identifier.sourcePhysics of Fluidsen_US
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dc.owningcollnamePhysics, Department of


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