High-frequency dispersion from viscous drag at the grain-grain contact in water-saturated sand.
Shear viscous drag within the thin fluid film at the contact between grains in water-saturated sand is an important loss mechanism for high-frequency sound in the Biot-Stoll plus contact squirt flow and shear viscous drag (BICSQS) model [J. Acoust. Soc. Am. 116, 2011-2022 (2004)]. Couette flow was assumed for the shear drag but it breaks down when inertial effects within the film become significant. Using Biot's method, a correction is derived for the shear drag and inserted into the BICSQS model. The result is a prediction of negative sound speed dispersion, consistent with dynamic theories of fluid-filled poroelastic bodies.
Chotiros
Nicholas P
NP
Isakson
Marcia J
MJ
D004548:Elasticity; D016062:Porosity; D033081:Shear Strength; D012822:Silicon Dioxide; D014783:Viscosity; D014867:Water
D014867:Water; D012822:Silicon Dioxide