Discharge Coefficients for Incompressible Non-Cavitating Flow through Long Orifices

Abstract

The results of a number of previous investigations of the discharge characteristics of parallel-bore orifices with length/diameter ratios up to 10 and Reynolds numbers up to about 10⁵are collected and discussed, together with new data which extend to Reynolds number as low as unity.

Simple empirical expressions, which fit the data well, are suggested for design purposes.

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