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.
- Nanotechnology Institute
Quasi-Static Liquid/Air Drainage in Narrow Channels
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Geoffroy, S, Plouraboue´, F, Amyot, O, & Prat, M. "Quasi-Static Liquid/Air Drainage in Narrow Channels." 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. 609-614. ASME. https://doi.org/10.1115/ICMM2005-75069
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