Variable frequency controllers drive the axial vane fan or
centrifugal blower, delivering air flow velocities from 3 m/sec [10 fps]
to a maximum of 25 m/sec [83 fps].
The modular design makes the tunnel highly configurable to more closely
simulate actual industrial duct installations. This capability allows more
realistic evaluations of atomizer performance to be performed. For
example, space limitations often dictate that gas conditioning atomizers
be installed in near proximity to up- or down-stream turns in the ducting.
By configuring the tunnel to duplicate these duct geometries, the affect
on the spray of the turbulent eddies, vortices and flow instabilities
created by these duct features can be investigated.
Additional modules are being planned that will allow the tunnel to be
run in closed-circuit mode. This upgrade will allow a wider range of gas
conditions and liquid simulants to be studied.