Effects of Eötvös Number and Dimensionless Liquid Volumetric Flux on Lateral Motion of a Bubble in a Laminar Duct Flow

Experiments and numerical simulations on lateral migration of a single bubble in stagnant liquids and laminar flows were conducted in the present study to examine the effects of the Eotvos number Eo and dimensionless liquid volumetric flux on lateral forces. It was confirmed that (1) a lateral force due to the existence of the wall acts on a bubble and (2) a lift force due to the net circulation of liquid strongly depends on Eo. Empirical models for the wall and lift forces were also proposed and their validity was confirmed by comparing measured and calculated bubble trajectories.