Block to granular-like transition in dense bubble flows

Details Block to granular-like transition in dense bubble flows Block to granular-like transition in dense bubble flows

2002-12-11

arxiv.org/abs/cond-mat/0212250v3

Europhys. Lett. 65 (3): 316-322 Feb. 2004

Physics

Condensed Matter

Soft Condensed Matter

Europhys. Lett. (2003) in press

Scientific paper

10.1209/epl/i2003-10103-6

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 $\theta$. For low $\theta$ values, a block motion is observed. For high $\theta$ values, the velocity profile becomes curved and a shear velocity gradient appears in the flow.

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