title: Instabilities in a liquid-fluidized bed of gas bubbles
abstract: Gas bubbles in an aqueous foam can be unjammed, or fluidized, by introducing a forced flow of the continuous liquid phase at a sufficiently high rate. We observe that the resulting bubble dynamics are spatially inhomogeneous, exhibiting a sequence of instabilities vs increasing flow rate. First irregular swirls appear, then a single convective roll, and finally a series of stratified convection rolls each with a different average bubble size.
authors.affiliation: Departments of Physics & Astronomy, UCLA, Los Angeles, California 90095-1547, USA.
authors.initials: MU
authors.lastname: Vera
authors.initials: A
authors.lastname: Saint-Jalmes
authors.initials: DJ
authors.lastname: Durian