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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Testimonials

Kidde Fire Training

We are manufacturers of all types of Fire Training Equipment i.e. Fire Houses, Aircraft, Ships etc and use the Concept range of Smoke Heads and Smoke Machines, in particular the ViCount 5000, over the last 15 years.

We use the oil based smoke system which produces smoke that will not dissipate when subjected to heat unlike water based smoke systems.

The Concept units have proven to be very reliable and robust when operated and maintained in accordance with Concept operating and maintenance instructions.

We have installed around 500 units some of which have been in service since being installed 15 years ago.

We have found Concept Engineering:

  • Provide excellent pre sales service
  • Supply superior oil based smoke machines
  • Provide excellent after sales service
  • Provide excellent technical support
  • Provide excellent telephone support