Unsteady Two-Phase Flow Measurements in Surges and Dam Break Waves

Chanson, Hubert (2004). Unsteady Two-Phase Flow Measurements in Surges and Dam Break Waves. In: Y. Matsumoto, K. Hishida, A. Tomiyama, K. Mishima and S. Hosokawa, Proceedings of the fifth International Conference on Multiphase Flow. Fith International Conference on Multiphase Flow, ICMF'04, Yokohama, Japan, (1-14). 30 May - 4 June, 2004.

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Author Chanson, Hubert
Title of paper Unsteady Two-Phase Flow Measurements in Surges and Dam Break Waves
Conference name Fith International Conference on Multiphase Flow, ICMF'04
Conference location Yokohama, Japan
Conference dates 30 May - 4 June, 2004
Proceedings title Proceedings of the fifth International Conference on Multiphase Flow
Place of Publication Japan
Publisher ICMF
Publication Year 2004
Sub-type Fully published paper
Editor Y. Matsumoto
K. Hishida
A. Tomiyama
K. Mishima
S. Hosokawa
Start page 1
End page 14
Total pages 14
Language eng
Abstract/Summary Flood waves resulting from dam breaks and flash floods have been responsible for numerous losses. In the present study, sudden flood releases were investigated down a large stepped waterway initially dry. A new experimental technique was developed to obtain instantaneous void fractions, bubble count rates and velocities. Unsteady air-water flow properties were recorded with arrays of conductivity probes. The results showed a strong aeration of the surge leading edge. Instantaneous velocity measurements indicated an unsteady turbulent boundary layer region with a potential flow above. In the unsteady boundary layer, void fraction and velocity data suggested a ratio of bubble diffusivity to eddy viscosity of about unity. Practically, the study provides new information on free-surface aeration in surging waters in channels and on beach slopes.
Subjects 290802 Water and Sanitary Engineering
290800 Civil Engineering
Keyword flood waves
sudden release
air entrainment
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Created: Mon, 08 Aug 2005, 10:00:00 EST by Hubert Chanson on behalf of School of Engineering