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Oscillations of a Sessile Droplet in Contact and Non-contact Modes Under an AC Electric Field

Sunder, Shyam (2017) Oscillations of a Sessile Droplet in Contact and Non-contact Modes Under an AC Electric Field. In: 5th International and 41st National Conference on Fluid Mechanics and Fluid Power, DEC 12-14, 2014, Indian Inst Technol Kanpur, Kanpur, INDIA, pp. 1565-1574.

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Official URL: http://dx.doi.org/10.1007/978-81-322-2743-4_149


In the present work we numerically investigate the oscillations of a sessile conducting droplet in the contact and non-contact modes under an alternating electric field. We show that the oscillations in the non-contact mode, where the needle electrode remains away from the drop, are caused by the electric forces due to charge accumulation at the apex of the drop. In the contact mode case, where the needle remains dipped inside the drop, the electric charge accumulates at the drop surface just above the dielectric coating with a maximum value near the three phase contact line. These charges push the three phase contact line outwards with an oscillatory force which leads to drop oscillations. We also observe that higher needle voltage (similar to 1 kV) is required for the non-contact mode while considerably less potential (similar to 10 V) is enough for the contact mode to cause drop oscillations.

Item Type: Conference Proceedings
Additional Information: Copy right for this article belongs to the SPRINGER-VERLAG BERLIN, HEIDELBERGER PLATZ 3, D-14197 BERLIN, GERMANY
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Depositing User: Id for Latest eprints
Date Deposited: 08 Mar 2017 09:52
Last Modified: 08 Mar 2017 09:52
URI: http://eprints.iisc.ac.in/id/eprint/56299

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