Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session T41: Bubbly Flows III
4:25 PM–6:09 PM,
Monday, November 20, 2023
Room: 206
Chair: Simo Makiharju, UC Berkeley
Abstract: T41.00006 : Lifetime of bubble clusters and their rise velocities in a quiescent liquid
5:30 PM–5:43 PM
Presenter:
Tian Ma
(Helmholtz-Zentrum Dresden - Rossendorf)
Authors:
Tian Ma
(Helmholtz-Zentrum Dresden - Rossendorf)
Hendrik Hessenkemper
(Helmholtz-Zentrum Dresden - Rossendorf)
Dirk Lucas
(Helmholtz-Zentrum Dresden - Rossendorf)
Andrew D Bragg
(Duke University)
bubbles in clusters and measure the cluster lifetimes. Our results show that 2-bubble clusters are the most common, however, 3 and 4-bubble clusters also often occur. The clusters persist on average for a time of order db/Ub (with db the bubble diameter and Ub the slip velocity), although rare clusters persisting for an order of magnitude longer are also observed. Furthermore, surfactants in the carrier liquid are observed to enhance the formation of bubble clusters and prolong the cluster lifetimes. The mean bubble rise velocities conditioned on the bubble cluster size are also explored, and we find a positive correlation between the cluster size and the rise speed of the bubbles in the cluster, with clustered bubbles rising up to 20% faster than unclustered bubbles.
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