Critical Flow Restricting Orifices Page: 3 of 6
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FLOW RESRICThNG ORIFICES
When the downstream pressure is less than the critical flow
pressure, the flow rate becomes independent of the downstream
pressure. This fact is later proven by the flow tests performed on
the two different sample plates.
The required flow parameters are:
A B C
fluid nitrogen air air
line size, in 0.25 0.25 0.50
p, lb/ft3 0.075 0.075 0.075
q, scfm 2 2 10
Ti,*F 60 7-0 70
pi, psia 45 115 115
The plates used for the testing had diameters of 0.099" (sharp edged
orifice) and 0.0867" (short tube orifice).
Two sample plates were fabricated, sized for an expected flow
rate of 10 scfm at 100 psig inlet pressure. Plate "A" was a sharp
edged orifice plate and plate "B" was a short tube orifice plate. The
tests were done with the help of D. Ostrowski using the set-up
shown in Figure 1.
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Kurita, C. H. Critical Flow Restricting Orifices, report, August 9, 1988; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc834961/m1/3/: accessed January 18, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.