The influence of surface roughness on the hydrodynamics of the falling water film in cooling towers
Abstract
This paper sets out the results of experiments for falling film at Rew = 70 ... 340 in the vertical channel of two coaxial tubes, ∅\varnothing∅ 37/17 mm, 1 m high, for a countercurrent 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 countercurrent airflow at w\ w w air = 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%.References
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processes in two-phase thermosyphon systems. The-
ory and Practice, Fact.
3.W., N. (1916) De ober
achenkondensation des
waserdampfes. Z. VDI, 60.
4.Banko, S., and Lee, S. (1983) Critical review of
the
ooding literature.
5.Hewitt G.F., W.G.B. (1963) Flooding and associ-
ated phenomena in falling lm
owing a vertical tube.
UKAEA Report, AERE-R4022.
6.T. Dyakowski, J.S. (1981) The qualication of the
kind of wavy motion of liquid layer by analysis of
changes of its thickness in time. 29-39, Information
bulletin of the institute of Heat Technology Warsaw
University of Technology, 58.
7.Zadrazil, I., and Markides, C.N. (2014) An experi-
mental characterization of liquid lms in downwards
co-current gas{liquid annular
ow by particle image
and tracking velocimetry. International Journal of
Multiphase Flow, 67, 42{53.
8. (2020) A technical review of research progress on
thin liquid lm thickness measurement. Experimental
and Computational Multiphase Flow, 2, N4.
9.Ito, D., Damsohn, M., Prasser, H.-M., and Aritomi,
M. (2011) Dynamic lm thickness between bubbles
and wall in a narrow channel. Experiments in Fluids,
51 (3), 821{833.
10.K., F. (1960) Stromungsuntersuchung hei Gegen-
strom von Riesellm und Gas in lotrechten Rohren.
VDJ-Forschangsheft, 4-81, 150.
11.V.O., T. (2010) Teplomasoobmin i hidrodynamika
paro hazoridynnykh potokiv v kanalakh z sitchastym
pokryttyam.
12.Celata, G.P., Cumo, M., and Setaro, T. (1992) A
data set of
ooding in circular tubes. Experimental
Thermal and Fluid Science, 5 (4), 437{447.
13.Pushkina O.L., S.Y.L. (1969) Breakdown of Liquid
Film Motion in Vertical Tubes. Heat Transfer, Sov.
Res., 1.
14.Zhao, Y., Markides, C.N., Matar, O.K., and He-
witt, G.F. (2013) Disturbance wave development
in two-phase gas{liquid upwards vertical annular
ow. International Journal of Multiphase Flow, 55,
111{129.
15.Hogan, K.J. (2009) A mechanistic model for
ood-
ing in vertical tubes.
16.Cioncolini, A., and Thome, J.R. (2010) Predic-
tion of the entrained liquid fraction in vertical annular
gas{liquid two-phase
ow. International Journal of
Multiphase Flow, 36 (4), 293{302.
17.Hussein, M.M., Al-Sarkhi, A., Badr, H.M., and
Habib, M.A. (2019) CFD modeling of liquid lm re-
versal of two-phase
ow in vertical pipes. Journal of
Petroleum Exploration and Production Technology, 9
(4), 3039{3070.
18.Lieblein, J., Korn, G.A., and Korn, T.M. (1961)
Mathematical Handbook for Scientists and Engineers.
Mathematics of Computation, 15 (76), 421.
Published
2020-06-11
How to Cite
KUZMENKO, Igor; GOURJII, Alexandre.
The influence of surface roughness on the hydrodynamics of the falling water film in cooling towers.
Journal of Power Technologies, [S.l.], v. 100, n. 2, p. 152-160, june 2020.
ISSN 2083-4195.
Available at: <https://papers.itc.pw.edu.pl/index.php/JPT/article/view/1579>. Date accessed: 21 nov. 2024.
Issue
Section
Power Plant
Keywords
falling film, countercurrent flow, capillary-porous wall surface, film thickness
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