smoke in wind tunnel

[mep]

Sorry I am also making one of these can you answer my question threats here.

I am wondering how the smoke in a wind tunnel is generated.
I need to know it because I have to visualise the air flow in a machine.

I need something to make the movement of the air visible like smoke or maybe some kind of colour.
In the machine is also a water jet and I wonder If the smoke will mix with the water.
This would be bad because I need a clear contrast between the water and air movement.

[mx_tifoso]

A simple google search yielded this:

http://www.uwal.org/download/documents/smokegen.pdf

http://www.physicsforums.com/showthread.php?t=239128

Sometimes google isn't enough, but you could always try and if that doesn't give you what you need then ask.