Block to granular-like transition in dense bubble flows
Abstract
We have experimentally investigated 2-dimensional dense bubble flows underneath inclined planes. Velocity profiles and velocity fluctuations have been measured. A broad second-order phase transition between two dynamical regimes is observed as a function of the tilt angle θ. For low θ values, a block motion is observed. For high θ values, the velocity profile becomes curved and a shear velocity gradient appears in the flow.
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