Abstract
The results of an experimental investigation of the end corrections for acoustic resistance and acoustic inertance for a concentric circular opening in a partition in a circular tube are presented. The end corrections are taken to be that length which must be added to the geometrical length of the orifice when introduced into an expression for the acoustic impedance. This expression can be derived on consideration of a tube of infinite length failed with a viscous, incompressible fluid. Used in this manner, the two end corrections are found to take on the same values, these values agreeing with those derived for inertance on the basis of the mass contribution due to higher order waves in the tube, treating the orifice as a plane piston source. Graphical criteria for the onset of measurable nonlinearity are presented.
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