Hydrodynamic flows in electrowetting.

Hydrodynamic flows in electrowetting. Research Abstract Details 

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Hydrodynamic flows in electrowetting. Abstract Text:

Sung Hee Ko,Horim Lee,Kwan Hyoung Kang,Sung Hee Ko,Horim Lee,Kwan Hyoung Kang,

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.

Hydrodynamic flows in electrowetting. Publishing Authors By Initials

SH Ko,H Lee,KH Kang,SH Ko,H Lee,KH Kang,

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Hydrodynamic flows in electrowetting. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Langmuir : the ACS journal of surfaces and colloid

VOLUME: 24

Page Numbers: 1094-101

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ISSN: 0743-7463

DAY: 5

MONTH: 01

YEAR: 2008

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LANGUAGE: eng

NlmUniqueID: 9882736

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AFFILIATION: Department of Mechanical Engineering, Pohang University of Science and Technology, San 31, Hyoja-dong, Pohang 790-784, South Korea.

Country: United States

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MEDLINETA: Langmuir

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