Dynamics of Two-Phase Flows

ISBN Print: 0-8493-9925-4

FLOW PATTERN TRANSITION DUE TO INSTABILITY OF VOIDAGE WAVE

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DOI: 10.1615/0-8493-9925-4.210
pages 441-452

S. Morioka Department of Aeronautical Engineering, Kyoto University, Kyoto, Japan

F. Joussellin Institute of Engineering Mechanics, University of Tsukuba, Tsukuba, Ibaraki, Japan

H. Monji Institute of Engineering Mechanics and Systems, University of Tsukuba, Tsukuba 305-8573, Japan

要約

In order to show that the transition from bubble flow to slug flow observed in a vertical riser is due to the instability of voidage wave, an analysis and a calculation are performed on the basis of a dilute bubbly liquid model. The result demonstrates such a possibility, together with expressions for propagation velocities, growth rate and coefficient of negative diffusion. A comparison is made with the experimental result.

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