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Dynamics of a Compound Droplet Under the Combined Influence of Electric Field and Shear Flow by Borthakur, Manash Pratim (author);Nath, Binita (author);Biswas, Gautam (author) is a Engineering article available to read on EtoBox.

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We present a numerical investigation on the dynamics of a compound droplet under the combined influence of an applied electric field and shear flow. The paper is carried out by solving the electro-hydrodynamic equations in a two-dimensional framework, and the interface is captured using a volume-of-fluid approach. Both perfect dielectric as well as leaky dielectric fluids are considered. For the case of dielectric fluids, the deformation of both the inner and outer interfaces can be modulated by either variation of the permittivity contrast between the fluids or the applied field strength. The nature of the polarization forces acting at both the interfaces can be either compressive or tensile depending on the magnitude of the permittivity ratio. The investigations for leaky dielectric fluids reveal that the ratio of electrical permittivity and conductivity between the two phases plays a critical role in deciding the magnitude of deformation and orientation of the compound droplet. The variation of charge accumulated at the interfaces modifies the behavior of the Coulombic forces thereby fundamentally altering the droplet deformation and orientation characteristics. Furthermore, it

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Author

Borthakur, Manash Pratim (author);Nath, Binita (author);Biswas, Gautam (author)

Publisher

American Physical Society (APS)

Published

2021

Language

EN

Field

Engineering (Physical Sciences)