Some devices used for delivering insecticides into open areas operate on "thermal" principle... How is that in detail ?

I do not think it is just matter of heating-up the fluid under an air blower flow.

 

Any light please?

 

Example : http://www.dynafog.com/international/foggers/

 

Miguel

Hi,

There are several ways. A natural fog (cloud or ground fog) is formed by condensation of vapor as the temperature drops below the dew point. A thermal fogger heats an oil-based liquid so it can condense in ambient air. Small droplets can also be created by pumping liquid through a small orifice; by slinging liquid from a spinning disk; by ultrasonic excitation; and by turbulent zone atomization. Foggers use a high turbulence vortex air nozzle to atomize liquid into tiny droplets.