Dense phase flow (plug flow)

• Waves of material fill the entire cross sectional area of the pipe
• Pick-up velocity 2 - 9 m/s (400 - 1800 fpm)
• Terminal velocity < 20 m/s (< 4000 fpm)
• Conveying pressure differential 2 - 4.5 bar (30 - 70 psi)
• Material to air ratio 20 - 200:1