Hydrodynamic forces on a clean spherical bubble translating in a wall-bounded linear shear flow
Pengyu Shi, Roland Rzehak, Dirk Lucas, Jacques Magnaudet
Abstract
Fully resolved simulations are conducted to determine hydrodynamic forces on clean spherical bubbles translating near a flat rigid wall in a linear shear flow. Flows range from low-but-finite $R\phantom{\rule{0}{0ex}}e$ to nearly inviscid situations. Based on simulation results, semi-empirical expressions for drag and lift forces at arbitrary $R\phantom{\rule{0}{0ex}}e$, relative shear rate, and separation distance are found. These improve over current `point-particle' models which ignore wall effects, and may be used to predict realistic bubble trajectories and distributions in wall-bounded flows.
Topics & Concepts
Inviscid flowBubbleMechanicsLift (data mining)DragShear flowPhysicsBounded functionClassical mechanicsMathematicsMathematical analysisComputer scienceData miningFluid Dynamics and MixingParticle Dynamics in Fluid FlowsFluid Dynamics and Heat Transfer