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ezabland Nov 29th 2017 12:11 PM

pressure drop through orifice? Please help!
 
I am trying to determine the orifice diameter for a pressure drop through an orifice. The pressure before the orifice is 10 cmH2O, the set pressure after the orifice is 8 cmH2O. There is a flow rate or air through the pipe of 25 L/min.
Hoping picture helps illustrate the question

Pressure drop Illustration
https://i.imgur.com/C1PG8o9.png

benit13 Nov 30th 2017 03:23 AM

To answer this one, I think you need to use a combination of Bernoulli's equation with Poiseuille's law:

See for example:
Pressure
Pressure


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