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Quasi-Static Liquid/Air Drainage in Narrow Channels

[+] Author Affiliations
S. Geoffroy, F. Plouraboué, O. Amyot, M. Prat

UMR CNRS-INP/UPS, Toulouse, France

Paper No. ICMM2005-75069, pp. 609-614; 6 pages
doi:10.1115/ICMM2005-75069
From:
  • 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
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-4185-5 | eISBN: 0-7918-3758-0
  • Copyright © 2005 by ASME

abstract

We study gas-liquid flows in a channel having a large aspect ratio at small capillary number. A channel of sinusoidal cross section was micro-machined in a polymeric material and covered by a transparent Plexiglas plate. The non-wetting gas (air) is injected at a controlled flow rate while the interface motion is recorded with a CCD video camera. From the convergence of asymptotic, numerical and experimental analysis, we found simple dependences for the finger width and total curvature as a function of channel aspect ratio. These results provide simple and general expressions for the pressure drop needed to over-come capillary forces and push the air finger inside the channel.

Copyright © 2005 by ASME

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