I'm seeking to find a formula which will allow me to very
approximately establish the pneumatic resistance of smooth walled
ducts at modest flow rates. I know Gargoyle knows but I can't convince
it to tell me. I'm sure more than one of the people receiving this
also know.

This is essentially a HVAC application.
Flow rates are in the few litres per second range.
Temperatures are in the 0 - 30 C range.
Wall material will ultimately be something smooth which may be a metal
on some or all faces.

If replying to this on a list I'd be obliged if you'd also copy any
useful answer to me directly as list servers sometimes swallow
responses for a while.



regards

        Russell McMahon
        Use whatever email address you already have for me, or else
use.
       CHANGE Q'S TO R'S  -->  quval@paqadise.net.nz   <--- CHANGE Q'S
TO R'S




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