Study on Two-Phase Flow Instability in Parallel Multi-channels

Experiments of two-phase flow instability in parallel multi-channels (of up to seven channels) using an apparatus with long or short riser pipes were performed. In both cases, the Type I density-wave instability was observed. In the experiments with shorter riser pipes the flow, as expected, was mor...

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Published inNihon Kikai Gakkai rombunshuu. B hen Vol. 61; no. 581; pp. 259 - 266
Main Authors Rao, Yan-Fei, Hasegawa, Shu, Fukuda, Kenji, Nakagawa, Kiyoshi, Kage, Kazuya
Format Journal Article
LanguageEnglish
Japanese
Published The Japan Society of Mechanical Engineers 1995
Subjects
Oscillation Modes
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ISSN0387-5016
1884-8346
DOI10.1299/kikaib.61.259

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Summary:Experiments of two-phase flow instability in parallel multi-channels (of up to seven channels) using an apparatus with long or short riser pipes were performed. In both cases, the Type I density-wave instability was observed. In the experiments with shorter riser pipes the flow, as expected, was more stabilized with smaller oscillation amplitudes than that with the long riser pipes. Oscillation modes were classified in to the following : a mode (n-1) channels in-phase with one channel out-of-phase, a mode (n-2) channels in-phase with two channels out-of-phase and a mode with channels having phase differences of 360/n deg with each other. The results agreed with the authors' previous predictions.
ISSN:0387-5016
1884-8346
DOI:10.1299/kikaib.61.259