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Cited 140 time in webofscience Cited 149 time in scopus
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Shape oscillation of a drop in ac electrowetting SCIE SCOPUS

Title
Shape oscillation of a drop in ac electrowetting
Authors
Oh, JMKo, SHKang, KH
Date Issued
2008-08-05
Publisher
AMER CHEMICAL SOC
Abstract
A sessile drop oscillates when an ac voltage is applied in electrowetting. The oscillation results from the timevarying electrical force concentrated on the three-phase contact line. Little is known about the feature of drop oscillation in electrowetting. In the present work, the drop oscillations are observed systematically, and a theoretical model is developed to analyze the oscillation. It is revealed that resonance occurs at certain frequencies and the oscillation pattern is significantly dependent on the applied ac frequencies. The domain perturbation method is used to derive the shape-mode equations under the assumptions of a weak viscous effect and small drop deformation. The electrical force concentrated on the three-phase contact line is approximated as a delta function, which is decomposed and substituted into each shape-mode equation as a forcing term. The theoretical results for the shape and frequency responses are compared with experimental results, which shows qualitative agreement.
URI
https://oasis.postech.ac.kr/handle/2014.oak/22608
DOI
10.1021/LA8007359
ISSN
0743-7463
Article Type
Article
Citation
LANGMUIR, vol. 24, no. 15, page. 8379 - 8386, 2008-08-05
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강관형KANG, KWAN HYOUNG
Dept of Mechanical Enginrg
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