Abstract
The results of an experimental study of the ascent of a compact cluster of monodispersed air bubbles in a viscous liquid are presented. To form a compact cluster of monodisperse air bubbles with given values of diameter and volume concentration, a special experimental setup has been developed. It is shown that the ascent velocity of a cluster of monodispersed air bubbles depends on their number, diameter, distance between bubbles and exceeds the ascent velocity of a single bubble. An empirical dependence for the drag coefficient of the cluster of air bubbles rising in glycerin has been obtained.
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