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    Long-range electrothermal fluid motion in microfluidic systems

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    ACEF-MS2.pdf
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    Final Accepted Manuscript
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    Author
    Lu, Yi cc
    Ren, Qinlong
    Liu, Tingting
    Leung, Siu Ling
    Gau, Vincent
    Liao, Joseph C.
    Chan, Cho Lik
    Wong, Pak Kin
    Affiliation
    Univ Arizona, Dept Aerosp & Mech Engn
    Univ Arizona, Coll Med
    Issue Date
    2016-07
    Keywords
    AC electrothermal flow
    Electrokinetics
    Microfluidics
    Buoyancy
    Computational fluid dynamics
    
    Metadata
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    Publisher
    PERGAMON-ELSEVIER SCIENCE LTD
    Citation
    Long-range electrothermal fluid motion in microfluidic systems 2016, 98:341 International Journal of Heat and Mass Transfer
    Journal
    International Journal of Heat and Mass Transfer
    Rights
    Copyright © 2016 Elsevier Ltd. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    AC electrothermal flow (ACEF) is the fluid motion created as a result of Joule heating induced temperature gradients. ACEF is capable of performing major microfluidic operations, such as pumping, mixing, concentration, separation and assay enhancement, and is effective in biological samples with a wide range of electrical conductivity. Here, we report long-range fluid motion induced by ACEF, which creates centimeter-scale vortices. The long-range fluid motion displays a strong voltage dependence and is suppressed in microchannels with a characteristic length below similar to 300 mu m. An extended computational model of ACEF, which considers the effects of the density gradient and temperature-dependent parameters, is developed and compared experimentally by particle image velocimetry. The model captures the essence of ACEF in a wide range of channel dimensions and operating conditions. The combined experimental and computational study reveals the essential roles of buoyancy, temperature rise, and associated changes in material properties in the formation of the long-range fluid motion. Our results provide critical information for the design and modeling of ACEF based microfluidic systems toward various bioanalytical applications. (C) 2016 Elsevier Ltd. All rights reserved.
    Note
    Available online 25 March 2016; 24 Month Embargo.
    ISSN
    00179310
    DOI
    10.1016/j.ijheatmasstransfer.2016.03.034
    Version
    Final accepted manuscript
    Sponsors
    This work was supported in part by the National Institutes of Health (R44AI088756 and DP2OD007161). The authors would like to thank Jose Miguel Valdez and Minqing Li for their valuable discussion and suggestions.
    Additional Links
    http://linkinghub.elsevier.com/retrieve/pii/S0017931015300806
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.ijheatmasstransfer.2016.03.034
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