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Nov5-09, 07:07 AM
Sci Advisor
P: 1,498
Theoretically you can use Bernoulli's equation to calculate a velocity, and therefore a mass flow. However, there will be frictional losses through the valve; you may need to consult with the manufacturer to obtain some sort of friction factor.

Also, if the velocity and Mach number are high enough, you may need to consider compressibility factors.