Viscosity, surface tension, and gravity effects on acoustic reflection and refraction

The idea of the present work is to study the effects of viscosity, surface tension, and gravity on Snell's law of reflection and refraction of an acoustic field from an interface between two fluids. The analysis leads to a number of non-trivial phenomena and corrections to Snell's law. While all these effects can be considered individually due to separation of the associated time scales, the contributions of surface tension to the gravity and viscosity cases are treated as well.