Pneumatic Conveying Overview

Dense Phase - Full Pipeline

Higher pressure differential

Lowest material velocities

Pipeline full of material

Dense Phase - Slug Flow

Medium-high pressure differential

Low material velocities

Material conveyed in a dune action

Dense Phase - Bed Flow

Medium pressure differential

Medium to high material velocities

Material partially fluidized to convey some particles above their saltation velocity above a bed of slower moving material

Lean Phase (Dilute Phase)

Lower pressure differential

Highest material velocity

Material conveyed above the saltation velocity of each particle meaning each particle is airborne within the gas stream