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Saltation and Pick-up Velocities

Published byMeryl Summers Modified over 6 years ago

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Presentation on theme: "Saltation and Pick-up Velocities"— Presentation transcript:

1 Saltation and Pick-up Velocities

2

3 Saltation Mechanism

4 Saltation and Pickup Velocities

5 Generalized pickup and saltation diagram

6 Experimental Setup for Pickup and Saltation Meausrements
Control Valve Rotameter Plug Collector 3 m 1 m Pressure Regulator Plexiglas Pipe -2/4 inches Filter Air Supply

7 Material Pressure Feed Vacuum Feed Vacuum Feed/Rest
Minimum Recommended Velocities at the Feed Point for Various Materials Material Pressure Feed Vacuum Feed Vacuum Feed/Rest m/s m/s m/s alumina calcium carbonate clay coffee beans corn(grits) corn shelled lime(hydrated) lime(pebble) malt phosphate PE pellets Salt Sand Soda ash Starch Sugar Wheat

8 Kalman et al. Generalized Velocities
Pickup Velocities

9 Master Curve Developed for threshold superficial velocities
General Expression

10 Archimedes Number Ar=ρ(ρp –ρ)d3 g/µ2 Ar*=KAr
Ar=ρ(ρp –ρ)d3 g/µ2 Ar*=KAr K- parameter function of specific properties affecting specific threshold velocity to modify the Archimedes number

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15 Saltation Velocity

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