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matlocc

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Reply with quote  #1 
HAs anyone tried milkweed for air flow? I use it when hunting to detect thermals. Not sure how it would respond to high airflow though.

matlocc

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Reply with quote  #2 
Also do you want turbulent flow or laminar?
gbwillson

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Reply with quote  #3 
Milkweed? Like what gets stuck on the window screens for your home? 

At low velocity almost anything that emits "smoke" will work. The trick is the lighting. Try lighting a cigar or incense stick and let it smolder for a while. Bring the smoke and a small flashlight into a dark room. Shining the light from various angles, front and back, and you will see how easy to visualize the smoke. Except that in an enclosed space like a collector, the placement of lights would be extremely limited. Tiny LED lights available today may make this easier. 

At high velocities, you will have a hard time producing enough "smoke". I remember Mythbusters did an aerodynamic test using oatmeal flakes! They were big enough to be easily be visible, but high speed video will help. Might be worth a try.

Greg in MN
Rick H Parker

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Reply with quote  #4 
You can get Fog/Smoke Machines that will do thousands of cubic feet per minute for under $50.00 ..... [idea]
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stmbtwle

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Reply with quote  #5 
Flooding the thing will be about as useful as none at all.
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gbwillson

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Reply with quote  #6 
Yes, people have tried using smoke/fog machines before. But the smoke isn't dense enough so the entire area becomes diluted with a weak smoke mixture. There may be concentrated mixtures available, but all the mixtures I've seen are pro-mixed. At which point the main issue is lighting.

Another point is smoke usually enters the airstream via a small wand, or nozzle of sorts. Check out how they test the aerodynamics of cars in a wind tunnel.

Greg in MN
Rick H Parker

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Reply with quote  #7 
Think I found a good source for the smoke ... heated baby oil (mineral oil).  From what I read, it is safe if you keep the density below 15mg/m³, 5mg/m³ recommended and it produces dense smoke. Getting the right mix of smoke and air would needs to be tailored to the application.

"In automotive testing we use baby oil. When heated it produces a thick white smoke that is non toxic in low volumes and doesn't stick to surfaces. I built my own smoke tester using a metal pressure fed wax-oil/underseal sprayer, I drilled a hole and inserted an automotive glow plug to heat the oil. You can then experiment with a pressure that works best for you. I have successfully filled car interiors with smoke under pressure and it hasn't left any residue."





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Rick H Parker
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