About the slow waves in curvilinear fluid layers

The slow wave can propagate in thin fluid layers surrounded by elastic media. This wave possesses dispersion and its velocity is equal to zero for null frequency. In order to investigate this wave, we consider several fluid layers between elastic media: (1) a plane layer, (2) cylindrical layer along element of cylinder, (3) cylindrical layer along directrix, and (4) spherical layer. In all cases we derive the expressions of velocities of the slow waves and compare these expressions. The slow waves carry big energy and are of great interest for investigation of waves propagating between holes. Bibl. 6 titles.