Interaction of two oscillating bubbles rising in a thin gap

Audrey Filella (1) , Véronique Roig (1) , Patricia Ern (1)

1 IMFT - Institut de mécanique des fluides de Toulouse

We investigate experimentally different mechanisms of hydrodynamic interaction between two oscillating bubbles rising in a liquid at rest confined in a thin gap cell. In order to understand the relation between the motion of a single bubble and its wake as well as the hydrodynamic interaction between two oscillating bubbles, we characterize the kinematics of the bubbles interaction using high speed cameras and we measure the associated liquid velocity by High-Frequency PIV. The motion of the trailing bubble is modified while passing through the unstable wake of the leading bubble: depending on the relative size of the bubbles and their relative position, we can observe horizontal attraction to the center of the leading bubble's wake, vertical entrainment, ejection of the second bubble by a vortex of the wake or a sequential combination of the three mechanisms.

Mots clés: Bubble hydrodynamics; Interactions

Domaines: Mécanique des fluides [physics.class-ph]

Audrey Filella, Véronique Roig, Patricia Ern. Interaction of two oscillating bubbles rising in a thin gap. American Physical Society DFD 2013, Nov 2013, Pittsburgh, United States. pp.0. ⟨hal-03668786⟩