Effect of slit length on linear and non-linear acoustic transfer impedance of a micro-slit plate

The effect of the slit length on acoustic transfer impedance micro-slit plates (MSPs) is investigated in linear and non-linear regime for a specific geometry. This geometry inspired by slits obtained cutting bending plate. MSPs are with arrays slit-shaped perforations, width order viscous boundary layer thickness. Impedance tube measurements two accurately manufactured compared to numerical solution Linearized Navier-Stokes equations analytical limits. plate single divided porosity. resistance independent In predicted two-dimensional model. regime, strongly dependent amplitude waves. inertance weakly porosity, low moderate amplitudes. For high amplitudes, complicated dependency inertia short found. One expects that most conclusions can be generalised other geometries.