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Correlations of Characteristics of Waves on a Film Falling Down on a Vertical Wall

[+] Author Affiliations
Y. Koizumi, R. Enari, H. Ohtake

Kogakuin University

Paper No. IMECE2005-82244, pp. 331-339; 9 pages
doi:10.1115/IMECE2005-82244
From:
  • ASME 2005 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Part B
  • Orlando, Florida, USA, November 5 – 11, 2005
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-4222-3 | eISBN: 0-7918-3769-6
  • Copyright © 2005 by ASME

abstract

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.

Copyright © 2005 by ASME
Topics: Waves

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