Abstract
A detailed study of the influence of axial length on the critical discharge coefficient of cylindrical orifices with sharp upstream edges is reported. Systematic consideration is given to the full range of geometries from the thin plate orifice up to the largest thickness/diameter ( t d ) ratios of practical interest. A simple theoretical approach is used together with a more complete description of the physical nature of the flow. A range of orifice geometries is identified for which the critical discharge coefficient is independent of Reynolds number and t d . Cylindrical nozzles in this range are particularly suited to critical flowmetering. They are simple to manufacture. Some new measurements are reported and these, together with existing experimental data, are shown to be consistent with the present analysis.
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