Air Flow Meter discussion (WAS: "I'm missing something...)
Greg Hermann
bearbvd at mindspring.com
Thu Nov 15 22:33:31 GMT 2001
Hence the amount of force on the flapper is
>proportional to the velocity of the flow.
NO, it is NOT.
It's proportional to the SQUARE of the velocity of the flow, and (directly)
proportional to the density. Flapper deflection at a given volume flow rate
therefore varies with the square root of the density ratio !!
If any of you doubt this, go get your nose into a fluid dynamics text for a
few weeks !!
Greg
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