Mechanisms of drag reduction by semidilute inertial particles in turbulent channel flow
Himanshu Dave, M. Houssem Kasbaoui
Abstract
We show that significant drag reduction can be achieved in a turbulent channel flow using appropriately scaled mono-disperse particles. We show that drag-reducing particles form very long ropes along the channel wall. These particle ropes interfere with the near-wall turbulence regeneration mechanisms, which causes partial re-laminarization of the flow and significant reduction of skin-friction drag.
Topics & Concepts
DragTurbulenceParasitic dragMechanicsReduction (mathematics)Flow (mathematics)Open-channel flowChannel (broadcasting)Particle (ecology)Drag coefficientPhysicsClassical mechanicsGeologyMathematicsEngineeringGeometryTelecommunicationsOceanographyParticle Dynamics in Fluid FlowsFluid Dynamics and Turbulent FlowsGranular flow and fluidized beds