ac electrokinetic manipulations of particles and fluids are important techniques in the development of lab-on-a-chip technologies. Most of these systems involve planar micro-electrode geometries, generating high strength electric fields. When these fields are applied to a dielectric medium, Joule heating occurs. Understanding electrothermal heating and monitoring the temperature in these environments are critical for temperature-sensitive investigations including biological applications. Additionally, significant changes in fluid temperature when subjected to an electric field will induce electrohydrodynamic flows, potentially disrupting the intended microfluidic profile. This work investigates heat generated from the interaction of ac electric fields and water at various electrical conductivities (from 0.92 mS/m to 390 mS/m). The electrode geometry is an indium tin oxide (ITO) electrode strip wide and a grounded, planar ITO substrate separated by a spacer with microfluidic features. Laser-induced fluorescence is used to measure the experimental changes in temperature. A normalization procedure that requires a single temperature-sensitive dye, Rhodamine B (RhB), is used to reduce uncertainty. The experimental electrothermal results are compared with theory and computer simulations.
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e-mail: stuart.williams@louisville.edu
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February 2010
Research Papers
Comparison of Experiments and Simulation of Joule Heating in ac Electrokinetic Chips
Stuart J. Williams,
Stuart J. Williams
Department of Mechanical Engineering,
e-mail: stuart.williams@louisville.edu
University of Louisville
, Louisville, KY 40292
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Steven T. Wereley
Steven T. Wereley
Search for other works by this author on:
Stuart J. Williams
Department of Mechanical Engineering,
University of Louisville
, Louisville, KY 40292e-mail: stuart.williams@louisville.edu
Pramod Chamarthy
Steven T. Wereley
J. Fluids Eng. Feb 2010, 132(2): 021103 (7 pages)
Published Online: February 4, 2010
Article history
Received:
May 27, 2009
Revised:
October 22, 2009
Online:
February 4, 2010
Published:
February 4, 2010
Citation
Williams, S. J., Chamarthy, P., and Wereley, S. T. (February 4, 2010). "Comparison of Experiments and Simulation of Joule Heating in ac Electrokinetic Chips." ASME. J. Fluids Eng. February 2010; 132(2): 021103. https://doi.org/10.1115/1.4000740
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