Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 13, Pages 3001-3004Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.3001
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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.
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