CHAIN BUBBLING IN VISCOUS LIQUIDS

When a gas is passed into a quiescent liquid held in a tall cylindrical column, significant bulk motion of the liquid occurs. The present work examines theoretically and experimentally the liquid motion induced by a chain of bubbles in a viscous liquid, one of the previously recognised regimes. The velocity profile and extra pressure drop, which is not Archimedean, induced in the liquid by the bubbling of gas from an orifice situated at the centre of the base of a tall cylindrical vessel, are shown to be in excellent agreement with a model of the flow supposing the gas to be equivalent to a line force acting vertically upwards along the axis at the centre of the cylinder. Finally the experimental data provide a partial verification of some recent work on the influence of neighbouring particles and vessel walls on the motion of a given particle. © 1969.