title: Nonlinearity of acoustic waves at solid-liquid interfaces.
abstract: The small-amplitude and finite-amplitude propagation characteristics of laser line source excited and laser detected Scholte waves are investigated. Acoustic waves with Mach numbers up to 0.054 are observed at the interface between water and glass. In our case of a hard solid-liquid interface, the Scholte wave propagates very much like a bulk wave, for which the simple-wave equation holds. The experimental results are well fitted with this model, extended with an attenuation term. An anomalously large (compared with low amplitude viscous effects) attenuation reveals possible leakage of energy from the Scholte wave to bulk waves, through a mechanism of nonlinear mixing between the different wave modes and viscosity induced turbulence.
authors.affiliation: Laboratorium voor Akoestiek en Thermische Fysica, Departement Natuurkunde, Katholieke Universiteit Leuven, Belgium.
authors.forename: Christ
authors.initials: C
authors.lastname: Glorieux
authors.forename: Kris
authors.initials: K
authors.lastname: Van de Rostyne
authors.forename: Vitalyi
authors.initials: V
authors.lastname: Gusev
authors.forename: Weimin
authors.initials: W
authors.lastname: Gao
authors.forename: Walter
authors.initials: W
authors.lastname: Lauriks
authors.forename: Jan
authors.initials: J
authors.lastname: Thoen
mesh_terms: D000162:Acoustics; D007834:Lasers; D017711:Nonlinear Dynamics; D013997:Time Factors