Development of quasiharmonic motions of a gas-streamlined liquid film

Quasiharmonic wave motions of a thin liquid film flowing in a vertical plane due to gravitational force, capillary forces, and a tangential stress acting on the film-gas boundary are considered. The region of existence and spectral characteristics of the quasiharmonic wave solutions in different film-motion regimes (cocurrent and countercurrent) are found.Translated from Zhurnal Prikladnoi Mekhaniki i Tekhnicheskoi Fiziki, No. 1, pp. 66–73, January–February, 1976.