Sometimes we want to measure the flow of a material that isn't happy
going through an impeller (or we might want to avoid having to maintain
the shaft seal). One way to accomplish this is with a differential
pressure transducer that looks at the difference of pressure across an
We can get volume or mass flow using the following equation
Q1 = upstream volumetric flow, m³/s
mf = mass flow rate at any point, kg/s
C = orifice flow coefficient
Y = expansion factor
A = cross-sectional area of orifice, m²
P1 = upstream pressure, Pa kg/(m ·s)
P2 = downstream pressure, Pa kg/(m ·s)
ρ1 = upstream fluid density, kg/m³
In practice , become a lumped constant along with any unit scaling- Let's call this constant , then
The flow is a constant times the square root of a constant times the pressure difference.
Panel meters often can figure out , and ρ1 by looking at two known flow rates.
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