Polydispersity Effects in the Dynamics and Stability of Bubbling Flows

Details Polydispersity Effects in the Dynamics and Stability of Bubbling Flows Polydispersity Effects in the Dynamics and Stability of Bubbling Flows

2005-09-27

arxiv.org/abs/physics/0509231v1

Physics

Fluid Dynamics

11 pages, 2 figures, presented at the 3rd NEXT-SigmaPhi International Conference, 13-18 August, 2005, Kolymbari, Crete

Scientific paper

10.1140/epjb/e2006-00128-7

The occurrence of swarms of small bubbles in a variety of industrial systems enhances their performance. However, the effects that size polydispersity may produce on the stability of kinematic waves, the gain factor, mean bubble velocity, kinematic and dynamic wave velocities is, to our knowledge, not yet well established. We found that size polydispersity enhances the stability of a bubble column by a factor of about 23% as a function of frequency and for a particular type of bubble column. In this way our model predicts effects that might be verified experimentally but this, however, remain to be assessed. Our results reinforce the point of view advocated in this work in the sense that a description of a bubble column based on the concept of randomness of a bubble cloud and average properties of the fluid motion, may be a useful approach that has not been exploited in engineering systems.

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