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Micro-Fluidic Flow Induced by High-Frequency AC Micro-Bubble Jets

[+] Author Affiliations
Dmitri Lastochkin, Ping Wang, Hsueh-Chia Chang

University of Notre Dame, Notre Dame, IN

Paper No. ICMM2004-2403, pp. 717-721; 5 pages
doi:10.1115/ICMM2004-2403
From:
  • ASME 2004 2nd International Conference on Microchannels and Minichannels
  • ASME 2nd International Conference on Microchannels and Minichannels
  • Rochester, New York, USA, June 17–19, 2004
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-4164-2
  • Copyright © 2004 by ASME

abstract

A new mechanism for generating a micron-sized bubble jet in an electrolyte within a micro-fluidic device is reported. A three-dimensional electrode tip is placed at the center of a micro-channel. All but the electrode tip is insulated with a dielectric film. A counter insulated electrode sits across the tip electrode and a large high-frequency (> 100 kHz) and high intensity (>1000 V) AC field is applied across the electrodes. The large voltage generates micron-sized bubbles at the tip which snaps off intermittently or continuously to produce a micro-bubble jet by a unique tip streaming mechanism. The ejected bubbles continue to be driven by an electrostatic force in the tip direction and move at a velocity in excess of 10 cm/sec. They drag a large surrounding liquid column around them to move at the same velocity and hence generate a pumping action stronger than all reported electro-kinetic micro-pumps.

Copyright © 2004 by ASME

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