Experimental Investigation of the Motion of a Pair of Bubbles at Intermediate Reynolds Numbers

Viscid–inviscid interactions of pairwise bubbles in a turbulent channel flow and their implications for bubble clustering

“…(2005) observed a vertical bubble chain rising at in quiescent liquid and identified that the bubbles tend to be scattered from the chain configuration. Kusuno & Sanada (2015) observed trajectories of pairwise bubbles rising in quiescent water at moderate Reynolds numbers and compared results with the model of Maeda et al. (2013).…”

“…Ogasawara & Takahira (2018) observed clusters of monodisperse bubbles rising near the wall at in an inclined channel. Kusuno, Yamamoto & Sanada (2019) used a set-up similar to Kusuno & Sanada (2015) and reported that the in-line configuration is unstable for pairwise bubbles rising at , and associated this instability with the wake-induced lift.…”

Three-dimensional dynamics of a pair of deformable bubbles rising initially in line. Part 1. Moderately inertial regimes

“…However, they found the equilibrium axisymmetric configuration to be unstable, confirming Harper's theoretical analysis (Harper 1970). The three-dimensional evolution of the bubble pair in moderately inertial regimes was explored in more detail by Kusuno & Sanada (2015) and Kusuno, Yamamoto & Sanada (2019), using ultrapure water and silicone oil, respectively. Several interaction scenarios were reported, including the DKT process and a distinct evolution (also noticed in the computations of Gumulya et al.…”

Interaction of two oscillating bubbles rising in a thin-gap cell: vertical entrainment and interaction with vortices

“…A comparison with axisymmetric numerical simulations taking into account bubble deformation further indicated that deformation cannot explain the deviation between experimental and numerical predictions of the equilibrium distance for intermediate Reynolds numbers (lower than 150) . Kusuno & Sanada (2015) performed experiments to check the validity range of the numerical results by Hallez & Legendre (2011). A focus was provided on the transverse motion for high-Re bubbles (up to Re = 300) initially released in-line, associated with the escape of the trailing bubble from the wake of the leading one, leading further to various types of interactions classified as separation, approach, coalescence and overtaking.…”