Fluid flow and mixing within drops in AC electrowetting

P. García-Sánchez; A. Ramos; F. Mugele

Fluid flow and mixing within drops in AC electrowetting

P. García-Sánchez^*, A. Ramos, F. Mugele

^*Corresponding author for this work

Physics of Complex Fluids

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

Abstract

Electrowetting generates flow patterns inside drops when AC voltages are employed. For AC frequencies around the drop eigenfrequency (typically O(1kHz) or less), capillary waves emanate from the contact line giving rise to a net motion in the bulk of the drop. This flow can be described by a capillary wave-driven Stokes drift. At higher AC frequencies (above 10kHz, depending on liquid conductivity) electrical currents generate nonuniform Joule heating, giving rise to temperature gradients and, consequently, gradients in conductivity and permittivity. We show how the electric field acting on these gradients can generate fluid flow (Electrothermally induced flows).

Original language	English
Title of host publication	14th International Conference on Miniaturized Systems for Chemistry and Life Sciences 2010, MicroTAS 2010
Pages	2101-2103
Number of pages	3
Volume	3
Publication status	Published - 1 Dec 2010
Event	14th International Conference on Miniaturized Systems for Chemistry and Life Sciences, µTAS 2010 - Groningen, Netherlands Duration: 3 Oct 2010 → 7 Oct 2010 Conference number: 14

Conference

Conference	14th International Conference on Miniaturized Systems for Chemistry and Life Sciences, µTAS 2010
Abbreviated title	MicroTAS 2010
Country/Territory	Netherlands
City	Groningen
Period	3/10/10 → 7/10/10

Keywords

Electrothermal flows
Electrowetting
Microfluidics
Mixing

Cite this

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title = "Fluid flow and mixing within drops in AC electrowetting",

abstract = "Electrowetting generates flow patterns inside drops when AC voltages are employed. For AC frequencies around the drop eigenfrequency (typically O(1kHz) or less), capillary waves emanate from the contact line giving rise to a net motion in the bulk of the drop. This flow can be described by a capillary wave-driven Stokes drift. At higher AC frequencies (above 10kHz, depending on liquid conductivity) electrical currents generate nonuniform Joule heating, giving rise to temperature gradients and, consequently, gradients in conductivity and permittivity. We show how the electric field acting on these gradients can generate fluid flow (Electrothermally induced flows).",

keywords = "Electrothermal flows, Electrowetting, Microfluidics, Mixing",

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year = "2010",

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day = "1",

language = "English",

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TY - GEN

T1 - Fluid flow and mixing within drops in AC electrowetting

AU - García-Sánchez, P.

AU - Ramos, A.

AU - Mugele, F.

N1 - Conference code: 14

PY - 2010/12/1

Y1 - 2010/12/1

N2 - Electrowetting generates flow patterns inside drops when AC voltages are employed. For AC frequencies around the drop eigenfrequency (typically O(1kHz) or less), capillary waves emanate from the contact line giving rise to a net motion in the bulk of the drop. This flow can be described by a capillary wave-driven Stokes drift. At higher AC frequencies (above 10kHz, depending on liquid conductivity) electrical currents generate nonuniform Joule heating, giving rise to temperature gradients and, consequently, gradients in conductivity and permittivity. We show how the electric field acting on these gradients can generate fluid flow (Electrothermally induced flows).

AB - Electrowetting generates flow patterns inside drops when AC voltages are employed. For AC frequencies around the drop eigenfrequency (typically O(1kHz) or less), capillary waves emanate from the contact line giving rise to a net motion in the bulk of the drop. This flow can be described by a capillary wave-driven Stokes drift. At higher AC frequencies (above 10kHz, depending on liquid conductivity) electrical currents generate nonuniform Joule heating, giving rise to temperature gradients and, consequently, gradients in conductivity and permittivity. We show how the electric field acting on these gradients can generate fluid flow (Electrothermally induced flows).

KW - Electrothermal flows

KW - Electrowetting

KW - Microfluidics

KW - Mixing

UR - http://www.scopus.com/inward/record.url?scp=84884308336&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:84884308336

SN - 9781618390622

VL - 3

SP - 2101

EP - 2103

BT - 14th International Conference on Miniaturized Systems for Chemistry and Life Sciences 2010, MicroTAS 2010

T2 - 14th International Conference on Miniaturized Systems for Chemistry and Life Sciences, µTAS 2010

Y2 - 3 October 2010 through 7 October 2010

ER -

Fluid flow and mixing within drops in AC electrowetting

Abstract

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Keywords

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