At 08:03 AM 10/1/02 -0700, you wrote:
>Is it possible to determine, or even estimate, the CFM passing through a
>hole by reading the pressure difference on each side of the hole. This
>would be ambient air at average humidity and about 75 degrees F.

Sure, basic fluid dynamics. For laminar flow the flow is proportional
to the pressure drop, for turbulent flow it is proportional to the
square root of the differential pressure.

Calculate the Reynolds number Re find out whether the flow is likely
to be laminar or turbulent (probably the latter). Re < 2000 for
laminar, Re > 2500 for turbulent flow. See any text on fluid dynamics
for the equations and units involved.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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