Configurable AC electroosmotic generated in-plane microvortices and pumping flow in microchannels |
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Authors: | Shih-Hao Huang Hui-Jung Hsueh Kuo-Yung Hung |
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Affiliation: | (1) Department of Mechanical and Mechatronic Engineering, National Taiwan Ocean University, No. 2, Beining Rd., Keelung, 202-24, Taiwan, ROC;(2) Institute of Mechanical and Electrical Engineering, Mingchi University of Technology, Taipei, 243-01, Taiwan, ROC |
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Abstract: | This paper proposes the patterned AC electroosmotic flows (AC-EOF) by simply grouping discrete electrodes together to form
various electrode configurations for generation of in-plane microvortices with clockwise/counter-clockwise rotation, and pumping
flow in a microchannel. The rotational direction of in-plane microvortices and pumping flow direction can be controlled using
the same electrode pattern by simple switching of the voltages on the electrodes. Microparticle image velocimetry (μPIV) was
used to characterize the flow fields of the generated in-plane microvortices and pumping flow. The rotational strength of
microvortices and flow rates of pumping flows were found to increase with the increase of the applied voltages, and an optimal
value was achieved at an appropriately applied frequency. Moreover, the dependency of the applied voltages, frequencies, and
the heights of the measured planes on the rotational strength of in-plane microvortices between the interdigitated and discrete
electrode configurations were examined. The discrepancy in electrode geometry results in a small performance reduction, whereas
it can be compensated for the ability of switching the rotational direction of in-plane microvortices using the same device.
The configurable in-plane microvortices and pumping flow in microchannels provide the potential for micromixing applications
and for the integration into a lab-on-a-chip system. |
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