Non-continuum effects on a squeezed gas film in a two-dimensional acoustic resonator

We study the effect of gas rarefaction and wall confinement on propagation vibroacoustic disturbances in a microchannel, generated by non-uniform (localized) time-harmonic oscillations one channel walls. The problem is studied entire range rates, combining continuum free-molecular limit analyses with direct simulation Monte Carlo calculations. Gas found to strongly increase signal decay rate, varying between slowly decaying propagating wave parallel walls at conditions, near-source confined acoustic perturbation regime. impact stationary scattering examined detail, replacing fully diffuse specular boundary reflections slightly reduce rate signal. frequency dependence force film calculated. Here, smooths transition resonance antiresonance behaviours observed A model set-up point delta source examined, for which closed-form expressions are hydrodynamic perturbations force. These assist rationalizing fundamental system response.