Particle Settling Velocities

Particle diameter (µm): Setting Velocity (m/s): Setting Velocity (mm/hr)
0.05 3.85E-07 1.39
0.06 4.75E-07 1.71
0.08 6.69E-07 2.41
0.1 8.82E-07 3.18
0.15 1.50E-06 5.40
0.2 2.26E-06 8.14
Typical Concept particle    
0.3 4.21E-06 15.16
0.4 6.76E-06 24.34
0.5 9.91E-06 35.68
0.6 1.37E-05 49.32
0.8 2.30E-05 82.80
1 3.48E-05 125.28
1.5 7.47E-05 268.92
2 1.30E-04 468.00
3 2.85E-04 1026.00
4 5.00E-04 1800.00
5 7.76E-04 2793.60
Typical competitor particle size    
6 1.11E-03 3996.00
8 1.96E-03 7056.00
10 3.06E-03 11016.00
15 6.84E-03 24624.00
20 1.21E-02 43560.00
30 2.72E-02 97920.00

The terminal settling velocity of an aerosol or "artificial smoke" particle increases rapidly with particle size. The settling velocity is proportional to the square of the particle diameter, although sub micron particles, such as those produced by Concept systems require the use of slip correction factors.

Calculated for standard density spheres at 293 K [20° C] and 101 kPa (1 atm).
"Aerosol Technology", William C. Hinds, Wiley-Interscience, 1999

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Graham Law - Head of Technical Services

"With our Spirit 900 having been in heavy use for two years we found ourselves requiring a rapid full service to fulfill a critical last minute schedule.

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Customer care like this is well above and beyond the normal and a very rare thing these days. 

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