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Wavy flow of a liquid film in the presence of a cocurrent turbulent gas flow. (English. Russian original) Zbl 1297.76014
J. Appl. Mech. Tech. Phys. 54, No. 5, 762-772 (2013); translation from Prikl. Mekh. Tekh. Fiz. 54, No. 5, 88-100 (2013).
Summary: Wavy downflow of viscous liquid films in the presence of a cocurrent turbulent gas flow is analyzed theoretically. The parameters of two-dimensional steady-state traveling waves are calculated for wide ranges of liquid Reynolds number and gas flow velocity. The hydrodynamic characteristics of the liquid flow are computed using the full Navier-Stokes equations. The wavy interface is regarded as a small perturbation, and the equations for the gas are linearized in the vicinity of the main turbulent flow. Various optimal film flow regimes are obtained for the calculated nonlinear waves branching from the plane-parallel flow. It is shown that for high velocities of the cocurrent gas flow, the calculated wave characteristics correspond to those of ripple waves observed in experiments.
76A20 Thin fluid films
76T10 Liquid-gas two-phase flows, bubbly flows
76F10 Shear flows and turbulence
Full Text: DOI
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