Vera, M. USaint-Jalmes, A.Durian, Douglas J2023-05-232023-05-232000-03-272017-10-10https://repository.upenn.edu/handle/20.500.14332/43362Gas 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.© 2000 American Physical Society. You van view the original article at: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.84.3001Physical Sciences and MathematicsPhysicsArticle