Description p 1 - inlet pressure Absolute pressure at the Venturi inlet p 2 - throat pressure Absolute pressure at the Venturi throat Δp - pressure drop Measured pressure difference D 1 - inlet diameter Venturi internal inlet diameter D 2 - throat diameter Venturi throat diameter e - expansion factor Coefficient used for compressible flow calculation C - coefficient of discharge Coefficient used for Venturi tube based on ISO 5167 R eD - inlet Reynolds Reynolds number calculated in front of the Venturi tube R ed - throat Reynolds Reynolds number calculated at the Venturi tube throat q 1 - volumetric flow rate Fluid flow rate in terms of units of volume per unit of time on the inlet conditions q - standard flow Flow rate at standard conditions.
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