Flow Patterns of Falling Liquid Film Observed Near an Obstacle

[+] Author and Article Information
Kenji Katoh

Department of Mechanical Engineering, Osaka City University, Sugimoto 3, Sumiyoshiku, Osaka 558, Japan

Hideomi Fujita

Department of Mechanical Engineering, Nagoya University, Furocho, Chikusaku, Nagoya 464, Japan

Masato Takaya

Honda R&D Co., Ltd., Tochigi R&D Center, Shimotakanezawa 4630, Hagacho, Hagagun, Tochigi Pref. 321-33, Japan

J. Fluids Eng 116(4), 801-807 (Dec 01, 1994) (7 pages) doi:10.1115/1.2911853 History: Received October 16, 1992; Revised February 15, 1994; Online May 23, 2008


The purpose of this study is to investigate the flow patterns of a falling liquid film as observed near an obstacle on a flow channel. In this report, a bend on the channel was chosen as the obstacle and the behavior of a ring-shaped swelling of the liquid film, which appears near the obstacle at a low flow rate, is considered. The Weber number at which the swelling shifts from upstream to downstream of the bend is theoretically estimated. The experimental results for the swelling behavior agree well with those of the above theory. Moreover, in order to investigate the characteristics of the stationary wave observed in the upstream side of the swelling, the wavelength and the damping rate of the amplitude were measured by the needle contact method and agree with theory.

Copyright © 1994 by The American Society of Mechanical Engineers
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