Discontinuous meniscus location in tapered capillaries driven by pressure difference and dielectrophoretic forces

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Abstract

We calculate the meniscus location in tapered capillaries under the influence of pressure difference and dielectrophoretic forces with and without gravity. We find that the meniscus location can be a discontinuous function of the pressure difference or the applied voltage and that the meniscus can "jump" to one end or another of the capillary. Phase diagrams are given as a function of the pressure and voltage, depending on the geometrical parameters of the system. We further consider a revision of the dielectric rise under dielectrophoretic force in wedge capillaries and in the case of electrowetting, where the dielectrophoretic force is a small perturbation. Finally, we also find discontinuous liquid-gas interface location in the case of liquid penetration into closed volumes.

Original languageEnglish
Pages (from-to)8028-8034
Number of pages7
JournalLangmuir
Volume23
Issue number15
DOIs
StatePublished - 17 Jul 2007

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