Dense bubble flow in a silo: an unusual flow of a dispersed medium.
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 nondeformable 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.
Bertho
Yann
Y
Group for Research and Applications in Statistical Physics (GRASP), Institut de Physique B5a, Université de Liège, Belgium.
Becco
Christophe
C
Vandewalle
Nicolas
N