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EXPERIMENT #2: A FAN AIRFLOW BOX
Our next attempt took a different approach. Rather than trying to straighten
the airflow directly, we used an airtight box (an adapted acrylic computer
case) with a baffle to eliminate the direct flow of the vortex to the anenometer. The only intake is the fan itself; the only exhaust, the anemometer
at the other end. Every seam, screw hole and vent other than the fan intake and the aneometer vane exhaust was sealed with clear packing tape. A baffle made of neon yellow postercard was affixed inside the box to ensure that there is no direct path between the fan and the anemometer.
Some judicious use of packing tape made this acrylic case completely
airtight.
The baffle ensures that the swirling fan exhaust vortex
does not reach the anenometer while introducing very little impedance. On top of that,
we no longer need to move the anemometer around hunting for the peak reading
during measurement because sealed box guarantees that any air blown into the box
flows out through the anemometer.
Fans are mounted using custom-cut grommets made of closed-cell foam.
Any air blown into the case is forced through this anemometer.
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