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Issue 3, 2004
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Electroosmotic flow with Joule heating effects

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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.

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Publication details

The article was received on 20 Nov 2003, accepted on 26 Jan 2004 and first published on 23 Feb 2004


Article type: Paper
DOI: 10.1039/B315036D
Citation: Lab Chip, 2004,4, 230-236

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    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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