Statistical characteristics of 3D waves & stationary 3D wave regimes for falling liquid films

Abstract eng:
In this paper we present results of experimental study of three-dimensional (3D) waves characteristics on the surface of the vertically falling liquid fihns. Experiments were carried out using liquids with various physical properties in the range of Reynolds numbers 5 < Re < 100. The statistical analysis of the 3D wave’s characteristics allowed us to characterize in detail different scenarios of downflow evolution of 3D waves and to determine the regimes of fiilly developed steady-state 3D wave flow. Noticeable differences between natural and forced wave evolution have been observed for the relatively small Reynolds numbers whereas for the higher Reynolds numbers fast evolution of the all characteristics with achievement of the steady-state 3D wave flow is distinctive.

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