Fluid mechanical model of the acoustic impedance of small orifices, Volume 2682
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acoustic behavior acoustic flow ACOUSTIC IMPEDANCE acoustic pressure acoustic velocity amplitude approaching the orifice approximately assumed asymptotically behavior of orifices boundary-layer cavity constant containing the orifice D*+L defined by Eqn displacement thickness driving pressure effects of viscosity end correction equations fluid mechanical model given by Eqn harmonic component high sound pressure incident sound pressure incompressible inflow Ingard and Ising Ingard and Ising's intense sound inviscid Ising and Thurston linear regime low sound pressure no-slip boundary condition nonlinear acoustic nonlinear regime orifice behaves orifice diameter Orifice flow orifice impedance orifice inlet velocity orifice outlet velocity orifice reactance orifice resistance orifice thickness orifice velocity oscillating predicting orifice quasi-steady manner ratio resistance and reactance Reynolds number shown in Figure shows singular slug mass small orifices solution to Eqn sound field sound pressure levels specified by Eqn Substituting Eqn tance term in Eqn time-averaged discharge coefficient values vena contracta viscous yields