Issue 3, 2004

Electroosmotic flow with Joule heating effects

Abstract

Electroosmotic flow with Joule heating effects was examined numerically and experimentally in this work. We used a fluorescence-based thermometry technique to measure the liquid temperature variation caused by Joule heating along a micro capillary. We used a caged-fluorescent dye-based microfluidic visualization technique to measure the electroosmotic velocity profile along the capillary. Sharp temperature drops close to the two ends and a high-temperature plateau in the middle of the capillary were observed. Correspondingly, concave–convex–concave velocity profiles were observed in the inlet–middle–outlet regions of a homogeneous capillary. These velocity perturbations were due to the induced pressure gradients resulting from axial variations of temperature. The measured liquid temperature distribution and the electroosmotic velocity profile along the capillary agree well with the predictions of a theoretical model developed in this paper.

Article information

Article type
Paper
Submitted
20 Nov 2003
Accepted
26 Jan 2004
First published
23 Feb 2004

Lab Chip, 2004,4, 230-236

Electroosmotic flow with Joule heating effects

X. Xuan, B. Xu, D. Sinton and D. Li, Lab Chip, 2004, 4, 230 DOI: 10.1039/B315036D

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