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

Bekonscot - Managing Director

For several years we went through numerous smoke generators to simulate a "burning building", an important feature in our presentation.  Although the effect produced was good, the reliability, servicing and running costs of the system were always a headache, with smoke machines sometimes lasting a few weeks before they failed.

In June 2000, on recommendation, we contacted Concept Smoke Systems regarding the smoke installation.  A ViCount system was installed and commissioned later that year and has been operating without failure ever since!! Smoke chemical consumption has fallen dramatically, serviceability has been 100% and the effect is as impressive as ever.  Minimising issues relating to maintenance, and maximising reliability has given all of our visitors (some 200,000 per year) the benefit of seeing the smoke effect.

We wouldn't hesitate to recommend these systems to other users who need reliable and cost-effective smoke!