This review describes the formation of microvortices in microfluidic systems, and discusses our experimental measurements that illustrate the velocity profiles inside such microvortices. Because of the micrometer dimensions of these vortices and the presence of high rotational velocities, we have observed a number of unique phenomena. One example is the dynamic formation of ring patterns of particles within the microvortex. The mechanism by which these patterns form relies on a balance between the centrifugal and displacement forces experienced by the re-circulating particles with a lift force exerted on the particles near the solid boundary of the microcavity. We also demonstrate the ability to orient and rotate precisely micro and nanometer -sized particles, individual DNA molecules, and single cells. Because of the high linear velocity (m/s) of fluid flow in constricted microchannels and to the small radii (< 10μm) of the microvortices, we have measured the presence of ultrahigh radial accelerations (v2/r) in such microvortices, which can reach 107 m/s2 or 106 times the gravitational acceleration (g).
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ASME 3rd International Conference on Microchannels and Minichannels
June 13–15, 2005
Toronto, Ontario, Canada
Conference Sponsors:
- Nanotechnology Institute
ISBN:
0-7918-4185-5
PROCEEDINGS PAPER
The Generation, Characterization and Application of Microvortices in Microfluidic Systems (Keynote Paper)
J. Patrick Shelby,
J. Patrick Shelby
University of Washington, Seattle, WA
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David S. W. Lim,
David S. W. Lim
University of Washington, Seattle, WA
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Jason S. Kuo,
Jason S. Kuo
University of Washington, Seattle, WA
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Daniel T. Chiu
Daniel T. Chiu
University of Washington, Seattle, WA
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J. Patrick Shelby
University of Washington, Seattle, WA
David S. W. Lim
University of Washington, Seattle, WA
Jason S. Kuo
University of Washington, Seattle, WA
Daniel T. Chiu
University of Washington, Seattle, WA
Paper No:
ICMM2005-75259, pp. 203-210; 8 pages
Published Online:
November 11, 2008
Citation
Shelby, JP, Lim, DSW, Kuo, JS, & Chiu, DT. "The Generation, Characterization and Application of Microvortices in Microfluidic Systems (Keynote Paper)." Proceedings of the ASME 3rd International Conference on Microchannels and Minichannels. ASME 3rd International Conference on Microchannels and Minichannels, Parts A and B. Toronto, Ontario, Canada. June 13–15, 2005. pp. 203-210. ASME. https://doi.org/10.1115/ICMM2005-75259
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