How many CFM of air flow through a pipe 6 inches to reach 80 mph wind speed? What is the math for this?
I'm trying to build a wind tunnel to do some tests and I'm having trouble figuring out how to determine this, so I know the fan right to purchase this. I have an anemometer yet, but that is only really necessary to monitor the speeds during testing. I just need to know how big of a fan (CFM requirements) I need to achieve these high wind speeds in the tunnel without having to go through a dozen followers through trial and error. Any help with this would be greatly appreciated. Thank you!
Calcualte the cross-sectional area inside the pipe in feet squares. Consider a cylinder of length l, which is 80 / 60 = 4 / 3 = 1.333 miles long. Convert the length in feet. If you multiply the square meter, with the length in feet, you get the volume per minute requirement is CFM (cubic feet per minute). It takes more to take care of losses, friction with the surface of tubing, etc. I'm not doing the math because I know I can do.
1981 52 inch Two Speed Hunter Originals
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