Standards Council of Canada

Effective flow area vs physical flow area of an orifice plate

Have you ever noticed that when a flow goes through an orifice plate, the fluid stream converges downstream of the orifice hole?  i.e. the effective flow area (downstream) is smaller than the physical flow area (upstream).

Question: How to calculate that effective flow area?  (Gerald)


Re: Effective flow area vs physical flow area of an orifice...

Dina Haines's picture
Permalink Submitted by Dina Haines on Sat, 2017/10/21 - 05:07

A fluid passing though an orifice constriction will experience a drop in pressure across the orifice. This change can be used to measure the flowrate of the fluid.

To calculate the flowrate of a fluid passing through an orifice plate, enter the parameters below. (The default calculation involves air passing through a medium-sized orifice in a 4" pipe, with answers rounded to 3 significant figures.)

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