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1 2020

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The influence of surface roughness on the hydrodynamics of the falling water film in cooling towers

Kuzmenko Igor, Gourjii Alexandre

Journal of Power Technologies

2020

Vol. 100, nr 2

152--160

This paper sets out the results of experiments for falling filmat Rew = 70 . . . 340 in the vertical channel of two coaxialtubes, ∅37/17 mm, 1 m high, for a counter current air flow with Reair = 2200 . . . 10⁴. Subject to investigation was falling film on smooth and capillary-porous wall surfaces at constant film thickness greater than the height of the capillary-porous coating (0.3 mm). It was established that film thickness is weakly dependent on the velocity of the counter current airflow at wair = 1.7. . . 7.3 m/s. The water concentration on a smooth surface is 2 times higher at the same film thickness. The results of flooding in a channel with a smooth wall surface confirm the validity of the Wallis equation with deviation up to 20%.