Bubble dynamics and bubble-induced agitation in the homogeneous bubble-swarm past a circular cylinder at small to moderate void fractions
Jubeom Lee, Hyungmin Park
Abstract
An investigation into how the presence of a circular cylinder disturbs a buoyancy-driven homogeneous bubble-swarm using a novel two-phase particle-image velocimetry is presented. Depending on the void fraction and ratio of bubble size to cylinder diameter, two regimes of bubble distribution in the cylinder wake are classified and corresponding mechanisms are explained. Also, the liquid-phase flow forms an interesting two-phase wake behind a cylinder. To analyze this, a novel model for bubble-induced agitation (Reynolds stress) that agrees well with the measurements is suggested.
Topics & Concepts
BubbleMechanicsWakeBuoyancyCylinderReynolds numberParticle image velocimetryPorosityPhysicsHomogeneousVoid (composites)Two-phase flowLocal VoidMaterials scienceClassical mechanicsFlow (mathematics)GeometryTurbulenceThermodynamicsMathematicsComposite materialFluid Dynamics and MixingMinerals Flotation and Separation TechniquesFluid Dynamics and Heat Transfer