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

A. Yu. Sakhnov; Сахнов А. Ю.; O. A. Volodin; Володин О. А.; N. I. Pecherkin; Печеркин Н. И.; A. N. Pavlenko; Павленко А. Н.

doi:10.31857/S0040364423030183

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

Authors: Sakhnov A.Y.¹, Volodin O.A.¹, Pecherkin N.I.¹, Pavlenko A.N.¹
Affiliations:
1. Kutateladze Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences
Issue: Vol 61, No 4 (2023)
Pages: 594-603
Section: Articles
URL: https://journals.rcsi.science/0040-3644/article/view/232756
DOI: https://doi.org/10.31857/S0040364423030183
ID: 232756

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Abstract

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.

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