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

Demonstration movies

scroll through the slides,
click on a thumnail and
view the movies

latest news

Latest News

> view all articles

Colt 4 Twin Turbo - New Product

Concept Smoke Systems are one of the leading smoke machine manufacturers... Read more >


ESS 2015

Concept are pleased to be exhibiting and supporting the Emergency Servic... Read more >

> view all

Testimonials

UK Fire Brigade

After using the Spirit 900 Smoke Generator and attending Concept's complimentary service and maintenance course:

"Concept offer a fantastic after sales service whether it be maintenance courses or queries - fully satisfied.  With my experience of dealing with Concept I find it difficult to see where improvements can be made as I feel 100% satisfied with the product, information and answers to any queries.

I feel that it gives a more realistic setting for difficult exercises, which improves the experience and motivation of students / crews.  The only other way would be to use obstruction masks that take the realism out of any training.

I would like to add, having worked with Concept over the last 18months I have found it educational and the staff are a credit to the company.  I would like to thank all the staff for the patience they have shown with dealing with my queries."