Abstract
The sedimentation of a homogeneous dispersion of gas bubbles in water is studied, using double optical probe and hot-film anemometry, for high bubble Reynolds number (300–500), and high void fraction α (0–0.3). An experimental device has been specially designed to produce a uniform swarm of monodisperse bubbles without recirculating motions in the liquid phase. It is found that the evolution of the rise velocity of the bubbles is very similar to the sedimentation of particles in dense regimes, the hindrance function being characterized by scaling in α 1/3. The fluctuating kinetic in the liquid, once scaled by the mean relative gas velocity, exhibits a remarkable linear evolution with the void fraction. Moreover, the energy associated with the agitation of the bubbles reaches a maximum value when the distance between bubbles decreases.
Published Version
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