JAPANESE JOURNAL OF MULTIPHASE FLOW
Online ISSN : 1881-5790
Print ISSN : 0914-2843
ISSN-L : 0914-2843
Volume 22, Issue 1
Displaying 1-2 of 2 articles from this issue
Papers
  • Xiaoran YU, Takayoshi KIKUCHI, Tatsuya HAZUKU, Tomoji TAKAMASA, Masaki ...
    2008 Volume 22 Issue 1 Pages 50-59
    Published: March 15, 2008
    Released on J-STAGE: October 29, 2008
    JOURNAL FREE ACCESS
    A precise and reliable measurement on superposing particles in multi-phase flow using an image process method is eagerly needed. In our research, we propose a stereo image method compounded with a new voting method, in which, we combine a normal-line algorithm with the voting method for the separating and locating of particles, and also devised a local maximum detection algorithm to improve the voting precision. After evaluating on measurement precision by simulation experiment, we present extensive experimental results on processing actual solid-liquid two-phase flow images using the proposed method. The result reveals that the presented method is effective and applicable for the detection of overlapping solid particles under a high void fraction condition than other methods.
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  • Tadashi SAKAGUCHI
    2008 Volume 22 Issue 1 Pages 60-74
    Published: March 15, 2008
    Released on J-STAGE: October 29, 2008
    JOURNAL FREE ACCESS
    Parameters in the typical correlations for volume fraction of gas-phase and frictional pressure drop of developed steady gas-liquid two-phase flows in pipes have been studied. The distribution parameter in the Drift-flux model for the volume fraction of gas-phase has been expressed by the seven non-dimensional groups composed of input physical quantities. The parameter used in correlation for frictional pressure drop by Lockhart-Martinelli and Chisholm has been expressed by the seven non-dimensional groups composed of input physical quantities and imaginary pressure drops. By using these new expressions, these flow characteristics can be calculated with higher precisions and the effects of various input physical quantities on them are obtained.
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