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Breakup of a Multiple Emulsion Drop in a Uniform Electric Field

✍ Scribed by Jong-Wook Ha; Seung-Man Yang

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 235 KB
Volume: 213
Category: Article
ISSN: 0021-9797
DOI: 10.1006/jcis.1999.6117

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✦ Synopsis

The steady deformation and breakup of emulsion drops in a uniform electric field are considered experimentally. Due to the low volume fraction of inner drops, the emulsions can be effectively assumed as Newtonian fluids with spatial nonuniformity. The measurements of the electrical properties show that the oilin-water (o/w) emulsion drop behaves like a conducting drop. On the other hand, the water-in-oil (w/o) emulsion drops can be regarded as inhomogeneous leaky dielectric drops. It is found that the viscosity ratio is not an important parameter within the small deformation limit and breakup mode of the o/w emulsion drops. In the case of w/o emulsion drops, however, the breakup mode depends on the viscosity ratio. Inherent nonuniformity of the emulsion drops makes drop more deformable and unstable. The tipstreaming is the dominant breakup mode of o/w emulsion drops when the nonuniformity of drop phase is appreciable.

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