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Control of Liquid-Bubble Interface to Create a Two-Phase, Dielectrophoretic Mesopump

[+] Author Affiliations
Christopher M. Helberg, Jenny E. Jackson, James E. Bryan

University of Missouri

Paper No. IMECE2005-82878, pp. 369-374; 6 pages
doi:10.1115/IMECE2005-82878
From:
  • ASME 2005 International Mechanical Engineering Congress and Exposition
  • Fluids Engineering
  • Orlando, Florida, USA, November 5 – 11, 2005
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 0-7918-4219-3 | eISBN: 0-7918-3769-6
  • Copyright © 2005 by ASME

abstract

A system was developed to study electrostatic force control in mesoscale and microscale fluidic phenomena. Utilizing the polarization (dielectrophoretic) force in a simple planar electrode configuration, control of a liquid-bubble interface is achieved. By applying a +dc voltage a 1Hz switching frequency to an array of four electrode pairs, pumping was produced with four fluids covering a wide range of electrical properties; the range of dielectric constant and electric conductivity was over 1 order of magnitude and 5 orders of magnitude, respectively. Simple analysis and initial experimentation provide evidence that the normal polarization stress at the liquid-bubble interface and surface tension are the primary driving force and retarding force, respectively that affect bubble motion.

Copyright © 2005 by ASME
Topics: Bubbles

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