We investigate the electrohydrodynamics of an initially spherical droplet under the influence of an external alternating electric field by conducting axisymmetric numerical simulations using a charge‐conservative volume‐of‐fluid based finite vol...
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https://www.riss.kr/link?id=O112849826
2020년
-
0173-0835
1522-2683
SCI;SCIE;SCOPUS
학술저널
1953-1960 [※수록면이 p5 이하이면, Review, Columns, Editor's Note, Abstract 등일 경우가 있습니다.]
0
상세조회0
다운로드다국어 초록 (Multilingual Abstract)
We investigate the electrohydrodynamics of an initially spherical droplet under the influence of an external alternating electric field by conducting axisymmetric numerical simulations using a charge‐conservative volume‐of‐fluid based finite vol...
We investigate the electrohydrodynamics of an initially spherical droplet under the influence of an external alternating electric field by conducting axisymmetric numerical simulations using a charge‐conservative volume‐of‐fluid based finite volume flow solver. The mean amplitude of shape oscillations of a droplet subjected to an alternating electric field for leaky dielectric fluids is similar to the steady‐state deformation under an equivalent root mean squared direct electric field for all possible electrical conductivity ratio (Kr) and permittivity ratio (S) of the droplet to the surrounding fluid. In contrast, our simulations for weakly conducting media show that this equivalence between alternating and direct electric fields does not hold for Kr≠S. Moreover, for a range of parameters, the deformation obtained using the alternating and direct electric fields is qualitatively different, that is, for low Kr and high S, the droplet becomes prolate under alternating electric field but deforms to an oblate shape in the case of the equivalent direct electric field. A parametric study is conducted by varying the time period of the applied alternating electric field, the permittivity and the electrical conductivity ratios. It is observed that while increasing Kr has a negligible effect on the deformation dynamics of the droplet for Kr<S, it enhances the deformation of the droplet when Kr>S for both alternating and direct electric fields. We believe that our results may be of immense consequence in explaining the morphological evolution of droplets in a plethora of scenarios ranging from nature to biology.
Editorial Board: Electrophoresis 23'20
Front Cover: Voltage control for microchip capillary electrophoresis analyses
Contents: Electrophoresis 23'20