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Hydrodynamic flows in electrowetting SCIE SCOPUS

Title
Hydrodynamic flows in electrowetting
Authors
Ko, SHLee, HKang, KH
Date Issued
2008-02-05
Publisher
AMER CHEMICAL SOC
Abstract
Hydrodynamic flows are generated inside a droplet in electrowetting when an ac voltage is applied. To discover the characteristics and origin of the flows, we investigated the flow pattern for a sessile droplet for various needle-electrode positions, electrolyte concentrations, and applied electrical frequencies. Two distinct types of flows were observed under current experimental conditions. In the typical experimental condition, a quite fast flow appears in the low-frequency range of about 10 Hz to 15 kHz. A different type of flow is observed in the high-frequency range of about 35 to 256 kHz, but this frequency range depends significantly on the electrolyte concentration. Most typically, the flow directions are different for the two flows. A shape oscillation of a droplet was observed in the low-frequency range by a high-speed camera. The flow in the low-frequency range is insensitive to the conductivity of the solution and may be caused by the interfacial oscillation of the droplet. The flow at high frequency is very sensitive to the conductivity of the solution and electrode position, so the high-frequency flow is believed to be caused by some electrohydrodynamic effect.
Keywords
REYNOLDS-NUMBER; DROP OSCILLATIONS; VIBRATION; DRIVEN; SPHERE; FILMS; WATER
URI
https://oasis.postech.ac.kr/handle/2014.oak/22964
DOI
10.1021/LA702455T
ISSN
0743-7463
Article Type
Article
Citation
LANGMUIR, vol. 24, no. 3, page. 1094 - 1101, 2008-02-05
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강관형KANG, KWAN HYOUNG
Dept of Mechanical Enginrg
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