Dense bubble flow in a silo: an unusual flow of a dispersed medium

Details Dense bubble flow in a silo: an unusual flow of a dispersed medium Dense bubble flow in a silo: an unusual flow of a dispersed medium

2005-08-11

arxiv.org/abs/cond-mat/0508296v2

Phys. Rev. E 73 (2006), 056309

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 6 figures

Scientific paper

10.1103/PhysRevE.73.056309

The dense flow of air bubbles in a two-dimensional silo (through an aperture D) filled with a liquid is studied experimentally. A particle tracking technique has been used to bring out the main properties of the flow: displacements of the bubbles, transverse and axial velocities. The behavior of the air bubbles is observed to present similarities with non-deformable solid grains in a granular flow. Nevertheless, a correlation between the bubble velocities and their deformations has been evidenced. Moreover, a new discharge law (Beverloo-like) must be considered for such a system, where the flow rate is observed to vary as D^{1/2} and depends on the deformability of the particles.

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