Behavior of a liquid film flows down counter-currently on the inner surface of a circular pipe was examined. In experiments, silicon oils of 500, 1000 and 3000 cSt as well as water were used as the liquid phase. The gas phase was air. A test section vertically oriented was a circular pipe of 30 mm in inner diameter and 5.4 m in length. The substrate thickness of the silicone film, where the film Reynolds number was quite low, was close to the mean film thickness while the water film substrate was much thinner than the mean film thickness. Waves were on the substrate. It was confirmed that there were waves with some certain amplitude even on the silicone films near the flooding occurrence where the film Reynolds number was quite low. The mean film thicknesses of silicon films as well as the water film were well expressed by applying the universal velocity profile to the film flow. When the film Reynolds number was lower than 600, the wave velocity was well predicted as the velocity of small perturbation waves on the laminar film. As the film Reynolds number becomes large, the wave velocity becomes slower than the small perturbation wave velocity. The correlation for the wave length was developed based upon the present experimental results. Combining it with the Nosoko correlations and modifying constants and exponents, new correlations for the wave velocity and the maximum film thickness were proposed. The correlations could predict these within 15% accuracy.

1.
Koizumi, Y., Ohtake, H. and Ueda, T., 1999. “A Study on the Minimum Wetting Rate of Isothermal Films Flowing Down on Outer Surface of Vertical Pipes,” Proc. 5th ASME/JSME Joint Thermal Engineering Conference, CD-RPM, AJTE996426.
2.
Inumaru J., Ohtaka, M. and Watanabe, H., 2000. “Droplet Entrainment of High-Viscosity Liquid in Counter-Current Annular Flow with Large Diameter Pipe,” Proc. of 37th National Heat Transfer Symposium of Japan, Vol. 3, 751–752.
3.
Telles
A. S.
and
Dukler
A. E.
,
1970
. “
Statistical Characteristics of Thin, Vertical, Wavy, Liquid Films
,”
Int. Eng. Chem. Fundam.
, Vol.
19
, No.
3
,
412
421
.
4.
Takahama
H.
and
Kato
S.
,
1980
. “
Longitudinal Flow Characteristics of Vertical Falling Liquid Films without Concurrent Gas Flow
,”
Int. J. Multiphase Flow
,
6
,
203
215
.
5.
Karapantsios
T. D.
,
Paras
S. V.
and
Karabelas
A. J.
,
1989
. “
Statistical Characteristics of Free Falling Films at High Reynolds Number
,”
Int. J. Multiphase Flow
, Vol.
15
, No.
1
,
1
21
.
6.
Nosoko
T.
,
Yoshimura
P. N.
,
Nagata
T.
and
Oyakawa
K.
,
1996
. “
Characteristics of Two-Dimensional Waves on a Falling Film
,”
Chem. Engng. Sci.
,
51
,
725
732
.
7.
Kurabayasi, M., Kobayasi, K. and Takamasa, T., 1999. “Velocity Measurement of Interfacial Waves on a Film Flowing Down a Vertical Tube Inner Wall Using an Image-processing Method and Laser Focus Displacement Meters, Proc. The 18th Multiphase Flow Symposium ’99, 111-112.
8.
Takamasa
T.
and
Kobayashi
K.
,
2000
. “
Measuring Interfacial waves on Film Flowing Down Tube Inner Wall using Laser Focus Displacement Meter
,”
Int. J. of Multiphase Flow
, Vol.
26
,
1493
1507
.
9.
Koizumi, Y., Ohtake, H. and Ikeda, S., 2000. “Characteristics of a Falling Liquid Film on the Outer Surface of a Vertical Pipe (Minimum Wetting Rate and Waves on the Film),” Proc. 2000 ASME IMEC&E, HTD Vol. 2, 197–203.
10.
Koizumi, Y., Ohtake, H. and Ikeda, S., 2001. “Characteristics of an R-113 Falling Liquid Film on the Outer Surface of a Vertical Pipe, 4th Int. Conf. on Multiphase Flow, CD-ROM.
11.
Carey, V. P., 1992. “Liquid-Vapor Phase-Change Phenomena,” Hemisphere Pub. Co., 106–113.
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