Physics – Classical Physics
Scientific paper
2005-09-05
Ultrasonics 41, 197-205 (2003)
Physics
Classical Physics
14 pages, 8 figures
Scientific paper
10.1016/S0041-624X(03)00100-8
It is demonstrated theoretically that the absorptivity of bulk shear sagittal waves by an ultra-thin layer of viscous fluid between two different elastic media has a strong maximum (in some cases as good as 100%) at an optimal layer thickness. This thickness is usually much smaller than the penetration depths and lengths of transverse and longitudinal waves in the fluid. The angular dependencies of the absorptivity are demonstrated to have significant and unusual structure near critical angles of incidence. The effect of non-Newtonian properties and non-uniformities of the fluid layer on the absorptivity is also investigated. In particular, it is shown that the absorption in a thin layer of viscous fluid is much more sensitive to non-zero relaxation time(s) in the fluid layer than the absorption at an isolated solid-fluid interface.
Gramotnev Dmitri K.
Mather Melissa L.
Nieminen Timo A.
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