Electroosmotic flow with Joule heating effects was examined numerically and experimentally in a micro capillary. Fluorescence-based thermometry and velocimetry techniques were employed to visualize the liquid temperature and the electroosmotic velocity profile, respectively. 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 the homogeneous capillary. The measured liquid temperature distributions and electroosmotic velocity profiles along the capillary agree well with the predictions of a theoretical model developed in this paper.

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