Modes of a Liquid Film Falling Down a Vertical Cylinder at Different Contact Angles

We present the results of a three-dimensional numerical simulation of the dynamics of a falling film of a mixture of refrigerants, 0.9 mol fraction R21 + R114, considering the liquid flow along the outer lateral surface of a round vertical cylinder for a Reynolds number of 104 and contact angles of...

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Bibliographic Details
Published in:High temperature 2023-08, Vol.61 (4), p.550-558
Main Authors: Sakhnov, A. Yu, Volodin, O. A., Pecherkin, N. I., Pavlenko, A. N.
Format: Article
Language:English
Subjects:
Atoms and Molecules in Strong Fields
Classical and Continuum Physics
Contact angle
Falling
Fluid flow
Heat and Mass Transfer and Physical Gasdynamics
Industrial Chemistry/Chemical Engineering
Laser Matter Interaction
Liquid flow
Materials Science
Physical Chemistry
Physics
Physics and Astronomy
Reynolds number
Tubes
Vertical cylinders
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Summary:We present the results of a three-dimensional numerical simulation of the dynamics of a falling film of a mixture of refrigerants, 0.9 mol fraction R21 + R114, considering the liquid flow along the outer lateral surface of a round vertical cylinder for a Reynolds number of 104 and contact angles of 10°, 30°, 50°, 70°, and 90°. The simulation was carried out using the volume of fluid (VOF) method in the OpenFOAM software. The contact angle has a significant effect on the area of the wetted surface due to a change in the modes of liquid falling down the cylinder. The following flow modes are identified: continuous film, stable jet mode, cascade jet mode, and massive jet mode. These modes are similar to the modes of fluid flow on horizontal tubes.
ISSN:0018-151X
1608-3156
DOI:10.1134/S0018151X23030173