EngineeringPetroleum EngineeringTransport PhenomenaBoundary Layer EffectsBoundary Layer FlowBoundary LayersBoundary-layer TheorySurface RoughnessSurface Roughness EffectsChannel RoughnessGrain RoughnessPlug FlowPlug Flow BehaviorPlug Flow ModelRough-wall Boundary LayersRoughness EffectsRoughness Effects On Boundary Layers
In a rough grain silo a boundary layer is formed along the wall. A simple calculation shows that a silo size independent discharge overpressure occurs due to dilation in the boundary layer during plug flow. Further the influence of geometrical imperfections normally is underestimated in model tests.