Journal
MICROFLUIDICS AND NANOFLUIDICS
Volume 12, Issue 1-4, Pages 355-369Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s10404-011-0880-8
Keywords
Microchannel; Gas-liquid Taylor flow; Microreactor; Visualisation experiments; Numerical simulation
Funding
- French Agence Nationale de la Recherche [ANR-09-BLAN-0381-01]
- CNRS research federation FERMaT
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The effect of fluid properties and operating conditions on the generation of gas-liquid Taylor flow in microchannels has been investigated experimentally and numerically. Visualisation experiments and 2D numerical simulations have been performed to study bubble and slug lengths, liquid film hold-up and bubble velocities. The results show that the bubble and slug lengths increase as a function of the gas and liquid flow rate ratios. The bubble and slug lengths follow the model developed by Garstecki et al. (Lab chip 6:437-446, 2006) and van Steijn et al. (Chem Eng Sci 62:7505-7514, 2007), however, the model coefficients appear to be dependent on the liquid properties and flow conditions in some cases. The ratio of the bubble velocity to superficial two-phase velocity is close to unity, which confirms a thin liquid film under the assumption of a stagnant liquid film. Numerical simulations confirm the hypothesis of a stagnant liquid film and provide information on the thickness of the liquid film.
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