Dynamics of Two-Phase Flows

ISBN Print: 0-8493-9925-4

BUBBLE SIZE EFFECT ON PHASE DISTRIBUTION

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DOI: 10.1615/0-8493-9925-4.180
pages 379-400

Akimi Serizawa Department of Nuclear Engineering, Kyoto University, Yoshida-Honmachi, Kyoto 606-8501, Japan

Itaru Michiyoshi Department of Nuclear Engineering, Kyoto University, Kyoto, Japan ; Engineering College of Matsue, Matsue, Japan

Isao Kataoka Institute of Atomic Energy, Kyoto University, Japan

Iztok Zun Laboratory for Fluid Dynamics and Thermodynamics, Faculty of Mechanical Engineering, University of Ljubljana, Askerceva 6, 1000 Ljubljana, Slovenia

Abstract

The effect of bubble size on phase distribution in vertically upward two-phase flow in a round tube is discussed based on measurement and visual observations. It turned out that, for fixed values of jl and jg, the phase distribution was drastically changed even with a small change of bubble-size distribution. The two-phase flow pattern transition was also affected very much by the bubble-size distribution. A formula was proposed to derive bubble-size distribution from the probability density function for bubble chord length, which takes into account the effect of multi-directional bubble movement.

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