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Open ended pipe.

Open ended pipe.

Open ended pipe.

(OP)
I am trying to calculate the airflow through open ended 0.125 inch ID vinyl tubes, 2 ft and 4 ft long with from 50 to 100 PSI on the other ends. It's for a unique application for a non profit organization.

RE: Open ended pipe.

Above about 15 psig, the velocity out the end of the tube is sonic velocity. The mass flow rate is density calculated at upstream pressure and temperature times the area times the sonic velocity (overstates it a bit because it ignores discharge effects, but it is usually close enough).

David Simpson, PE
MuleShoe Engineering

"Belief" is the acceptance of an hypotheses in the absence of data.
"Prejudice" is having an opinion not supported by the preponderance of the data.
"Knowledge" is only found through the accumulation and analysis of data.
The plural of anecdote is not "data"

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