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Thermophysics and Aeromechanics

2015 year, number 2

Simulating nonlinear waves on the surface of thin liquid film entrained by turbulent gas flow

I.S. Vozhakov, D.G. Arkhipov, and O.Yu. Tsvelodub
Novosibirsk State University, Novosibirsk, Russia
Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
E-mail: vozhakov@gmail.com
Keywords: falling film, gas flow, model system, stability, evolution of perturbations
Pages: 191–202

Abstract

A new system of equations has been derived to simulate the dynamics of long-wave perturbations on the surface of a thin layer of viscous liquid, flowing down a vertical plane and blown by co-current turbulent gas flow. The analysis of linear stability of the unperturbed flow has been performed. It has been found that at moderate Reynolds numbers of liquid, Benjamin linear model and model of boundary conditions transfer to the unperturbed level for a disturbed gas flow give qualitatively similar results. With decreasing Reynolds number differences between the results obtained by different turbulence models become more pronounced. In the case of small Reynolds numbers of fluid, the system of equations results in a single evolution equation for film thickness deviation from the undisturbed level. Some solutions of this equation have been considered.

DOI: http://dx.doi.org/10.1134/S0869864315020067