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Dumazer G, Sandnes B, Ayaz M, et al. Frictional Fluid Dynamics and Plug Formation in Multiphase Millifluidic Flow. Phys Rev Lett. 2016;117(2):028002doi: 10.1103/PhysRevLett.117.028002.
Dumazer, G., Sandnes, B., Ayaz, M., Måløy, K. J., & Flekkøy, E. G. (2016). Frictional Fluid Dynamics and Plug Formation in Multiphase Millifluidic Flow. Physical review letters, 117(2), 028002. https://doi.org/10.1103/PhysRevLett.117.028002
Dumazer, Guillaume, et al. "Frictional Fluid Dynamics and Plug Formation in Multiphase Millifluidic Flow." Physical review letters vol. 117,2 (2016): 028002. doi: https://doi.org/10.1103/PhysRevLett.117.028002
Dumazer G, Sandnes B, Ayaz M, Måløy KJ, Flekkøy EG. Frictional Fluid Dynamics and Plug Formation in Multiphase Millifluidic Flow. Phys Rev Lett. 2016 Jul 08;117(2):028002. doi: 10.1103/PhysRevLett.117.028002. Epub 2016 Jul 07. PMID: 27447527.
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Phys Rev Lett. 2016 Jul 08;117(2):028002. doi: 10.1103/PhysRevLett.117.028002. Epub 2016 Jul 07.

Frictional Fluid Dynamics and Plug Formation in Multiphase Millifluidic Flow.

Physical review letters

Guillaume Dumazer, Bjørnar Sandnes, Monem Ayaz, Knut Jørgen Måløy, Eirik Grude Flekkøy

Affiliations

  1. Department of Physics, University of Oslo, P.O. Box 1048 Blindern Oslo, Norway.
  2. College of Engineering, Swansea University, Bay Campus, Swansea SA1 8EN, United Kingdom.

PMID: 27447527 DOI: 10.1103/PhysRevLett.117.028002

Abstract

We study experimentally the flow and patterning of a granular suspension displaced by air inside a narrow tube. The invading air-liquid interface accumulates a plug of granular material that clogs the tube due to friction with the confining walls. The gas percolates through the static plug once the gas pressure exceeds the pore capillary entry pressure of the packed grains, and a moving accumulation front is reestablished at the far side of the plug. The process repeats, such that the advancing interface leaves a trail of plugs in its wake. Further, we show that the system undergoes a fluidization transition-and complete evacuation of the granular suspension-when the liquid withdrawal rate increases beyond a critical value. An analytical model of the stability condition for the granular accumulation predicts the flow regime.

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