6. Calculation of a flowmeter with depressurizing element

6.1 Available data

Over the last century, many experimenters have measured discharge coefficients. $C$ of various depressant organs. The data were first collected in tables, then smoothed out in the form of empirical relationships that could be processed by desktop numerical calculators, then by microcomputers; these relationships are therefore evolving, and the formulation due to Stolz, used since 1980 for diaphragms, is tending to become obsolete in favor of the Reader-Harris/Gallagher equation. (17)...