Reflection of sound at an interface, taking into account mass and heat transport across it (Q1058930)

With the aid of an equation which was derived by the second author [Phys. Rev., III. Ser. A 8, 2574-2585 (1973)], five boundary conditions are given for a two-phase system. These boundary conditions include the two of classical acoustics, namely, steadiness of pressure and of the normal component of particle velocity across the interface. They permit a calculation of coefficients of reflection and transmission which obtain the classical acoustic coefficients as leading terms. Moreover, three transformation coefficients are given, describing the movement of the interface and the propagation of heat waves in the liquid and vapour. The time-averaged energy dissipation is calculated.