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Electrothermal flows generated by alternating and rotating electric fields in microsystems

Electrothermal flows generated by alternating and rotating electric fields in microsystems
Electrothermal flows generated by alternating and rotating electric fields in microsystems
Electrothermal motion in an aqueous solution arises from the action of an electric field on inhomogeneities in the liquid induced by temperature gradients. The temperature field can be produced by the applied electric field through Joule heating, or caused by external sources, such as strong illumination. Electrothermal flows in microsystems are usually observed at applied signal frequencies around 1 MHz and voltages around 10 V. In this work, we present self-similar solutions for the motion of an aqueous solution in a constant temperature gradient placed on top of: (a) two coplanar electrodes subjected to an a.c. potential difference, and (b) four coplanar electrodes subjected to a four-phase a.c. signal, generating a rotating field. The first case produces two-dimensional rolls whereas the second case produces a liquid whirl. Finally, we present experimental results of electrothermal liquid flows generated by alternating and rotating electric fields under strong illumination, and these experiments are compared to the analytical solutions. The induced rotating flow could be used in the mixing of analytes and of liquids in microsystems.
0022-1120
415-433
González, Antonio
3121380d-cafa-4347-8a10-51491d5ed0ca
Ramos, Antonio
511ab594-f312-45ce-b7ff-ef348fd9b559
Morgan, Hywel
de00d59f-a5a2-48c4-a99a-1d5dd7854174
Green, Nicolas G
d9b47269-c426-41fd-a41d-5f4579faa581
Castellanos, Antonio
aa989a75-63b0-4f3e-a36b-370545034d7b
González, Antonio
3121380d-cafa-4347-8a10-51491d5ed0ca
Ramos, Antonio
511ab594-f312-45ce-b7ff-ef348fd9b559
Morgan, Hywel
de00d59f-a5a2-48c4-a99a-1d5dd7854174
Green, Nicolas G
d9b47269-c426-41fd-a41d-5f4579faa581
Castellanos, Antonio
aa989a75-63b0-4f3e-a36b-370545034d7b

González, Antonio, Ramos, Antonio, Morgan, Hywel, Green, Nicolas G and Castellanos, Antonio (2006) Electrothermal flows generated by alternating and rotating electric fields in microsystems. Journal of Fluid Mechanics, 564, 415-433. (doi:10.1017/S0022112006001595).

Record type: Article

Abstract

Electrothermal motion in an aqueous solution arises from the action of an electric field on inhomogeneities in the liquid induced by temperature gradients. The temperature field can be produced by the applied electric field through Joule heating, or caused by external sources, such as strong illumination. Electrothermal flows in microsystems are usually observed at applied signal frequencies around 1 MHz and voltages around 10 V. In this work, we present self-similar solutions for the motion of an aqueous solution in a constant temperature gradient placed on top of: (a) two coplanar electrodes subjected to an a.c. potential difference, and (b) four coplanar electrodes subjected to a four-phase a.c. signal, generating a rotating field. The first case produces two-dimensional rolls whereas the second case produces a liquid whirl. Finally, we present experimental results of electrothermal liquid flows generated by alternating and rotating electric fields under strong illumination, and these experiments are compared to the analytical solutions. The induced rotating flow could be used in the mixing of analytes and of liquids in microsystems.

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Published date: 15 September 2006
Organisations: Electronics & Computer Science

Identifiers

Local EPrints ID: 355535
URI: https://eprints.soton.ac.uk/id/eprint/355535
ISSN: 0022-1120
PURE UUID: f3d82688-ba41-4179-9186-ead1e880019e
ORCID for Hywel Morgan: ORCID iD orcid.org/0000-0003-4850-5676
ORCID for Nicolas G Green: ORCID iD orcid.org/0000-0001-9230-4455

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Date deposited: 22 Oct 2013 13:43
Last modified: 17 Sep 2019 00:52

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Contributors

Author: Antonio González
Author: Antonio Ramos
Author: Hywel Morgan ORCID iD
Author: Nicolas G Green ORCID iD
Author: Antonio Castellanos

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