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Electrokinetic microflow instability with conductivity gradients

Publication ,  Journal Article
Chen, CH; Lin, H; Lele, SK; Santiago, JG
Published in: American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED
January 1, 2003

We have experimentally identified and quantified an electrokinetic flow instability that occurs in DC-electric-field driven microfluidic channels with significant conductivity gradients. We have, for the first time, developed a physical model for this instability which captures the interactions between bulk charge accumulation, electromigration, convection, and diffusion. A linear stability analysis based on this model captures key physics of this convective instability with a threshold electric field. The model and experiments show conductivity gradients and their associated bulk charge accumulation are crucial for such instabilities.

Duke Scholars

Published In

American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED

DOI

ISSN

0888-8116

Publication Date

January 1, 2003

Volume

259

Start / End Page

499 / 501

Related Subject Headings

  • Mechanical Engineering & Transports
 

Citation

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Chen, C. H., Lin, H., Lele, S. K., & Santiago, J. G. (2003). Electrokinetic microflow instability with conductivity gradients. American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED, 259, 499–501. https://doi.org/10.1115/IMECE2003-55007
Chen, C. H., H. Lin, S. K. Lele, and J. G. Santiago. “Electrokinetic microflow instability with conductivity gradients.” American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED 259 (January 1, 2003): 499–501. https://doi.org/10.1115/IMECE2003-55007.
Chen CH, Lin H, Lele SK, Santiago JG. Electrokinetic microflow instability with conductivity gradients. American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED. 2003 Jan 1;259:499–501.
Chen, C. H., et al. “Electrokinetic microflow instability with conductivity gradients.” American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED, vol. 259, Jan. 2003, pp. 499–501. Scopus, doi:10.1115/IMECE2003-55007.
Chen CH, Lin H, Lele SK, Santiago JG. Electrokinetic microflow instability with conductivity gradients. American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED. 2003 Jan 1;259:499–501.

Published In

American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED

DOI

ISSN

0888-8116

Publication Date

January 1, 2003

Volume

259

Start / End Page

499 / 501

Related Subject Headings

  • Mechanical Engineering & Transports