JAPANESE JOURNAL OF MULTIPHASE FLOW
Online ISSN : 1881-5790
Print ISSN : 0914-2843
ISSN-L : 0914-2843
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Volume 9, Issue 2
Displaying 1-6 of 6 articles from this issue
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  • Earthquake and Multiphase Flows
    Manabu YAMAGUCHI, Kohji MICHIOKU
    1995 Volume 9 Issue 2 Pages 97
    Published: June 15, 1995
    Released on J-STAGE: February 22, 2011
    DOIhttps://doi.org/10.3811/jjmf.9.97
    JOURNAL FREE ACCESS
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  • Is Earthquake Prediction Possible or Not?
    Earthquake Prediction by Telluric Current Monitoring
    Toshiyasu NAGAO
    1995 Volume 9 Issue 2 Pages 98-104
    Published: June 15, 1995
    Released on J-STAGE: February 22, 2011
    DOIhttps://doi.org/10.3811/jjmf.9.98
    JOURNAL FREE ACCESS
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    On 5:46Am, January 17, 1995, devastating earthquake with magnitude 7.2 hit western Japan. This earthquake was finally named “Hanshin-Awaji earthquake disaster”, and lost over 5, 500 people. Were we able to predict this earthquake? We introduce the method of earthquake prediction by monitoring electro magnetic phenomena, especially telluric current measurements.
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  • Occurrence of Fire Whirls around Multiple Fires in Cross Wind
    Kuniro YAMASHITA
    1995 Volume 9 Issue 2 Pages 105-115
    Published: June 15, 1995
    Released on J-STAGE: February 22, 2011
    DOIhttps://doi.org/10.3811/jjmf.9.105
    JOURNAL FREE ACCESS
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    In order to elucidate the physical processes of the formation of fire whirl, a series of laboratory experiments on three dimentional temperature profile of crib fire plume in cross wind were performed. From the experimental result, it became evident that a fire in cross wind produces a pair of vortex-like circulation in the downstream side of fire plume. In rare occasions, fire whirls were observed in the series of experiment of multiple fires at the central or leeward part of multiple fires under weak wind.
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  • An Invitation to Seismoachaeology
    Akira SANGAWA
    1995 Volume 9 Issue 2 Pages 116-120
    Published: June 15, 1995
    Released on J-STAGE: February 22, 2011
    DOIhttps://doi.org/10.3811/jjmf.9.116
    JOURNAL FREE ACCESS
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    [in Japanese]
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  • Effect of Liquid Viscosity on Liquid-Lump Velocity in Vertical-Upward Gas-Liquid Two-Phase Flow
    Velocity Characteristics of the Long-Life Liquid Lump
    Tohru FURUKAWA
    1995 Volume 9 Issue 2 Pages 121-131
    Published: June 15, 1995
    Released on J-STAGE: February 22, 2011
    DOIhttps://doi.org/10.3811/jjmf.9.121
    JOURNAL FREE ACCESS
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    The effect of liquid viscosity on the liquid-lump velocities was experimentally investigated for vertical-upward co-current flow of air and liquid in a 19.2mm ID cylindrical pipe. Water and glycerol solutions were used as working fluids to change the kinematic viscosity of liquid phase from 1.0×10-6 to 15.5×10-6m2/s. Flow regimes considered were slug flow, huge wave flow and annular flow. The liquid-lump velocities are discussed paying attention to the long-life liquid lump.The liquid-lumps were discriminated based on the time-spatial characteristic map of gas-liquid interfaces, which was drawn by using the mean liquid holdup signals detected by 70 pairs of holdup sensors arranged axially with a spacing of 15mm over the length of 1.035m. Velocities of this liquid lump were determined by the two arbitrary adjacent liquid holdup signals out of 70 ones. It is elucidated that the liquid vicosity has strong effects on the passing frequencies, the mean velocity and its standard deviations of the long-life liquid lumps. Furthermore, based on the characteristics of these values the effect of liquid viscosity upon the transition of flow regimes is discussed.
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  • Study on Prediction of Annular-Mist Flow Based on the Three-Fluid Model
    2nd Report, Study on Constitutive Equations of Drag Force and Interfacial Shear Stress
    Yutaka ABE, Akio TOMIYAMA, Isao KATAOKA
    1995 Volume 9 Issue 2 Pages 132-149
    Published: June 15, 1995
    Released on J-STAGE: February 22, 2011
    DOIhttps://doi.org/10.3811/jjmf.9.132
    JOURNAL FREE ACCESS
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    Interfacial shear stress and liquid film thickness are important for the estimation of deposition and entrainment rates which are used in three-fluid model. An analytical model was developed to estimate the interfacial shear stress and liquid film thickness in the annular-mist flow. This model was used to verify the applicability of the present correlations of the interfacial and wall friction factors and drag coefficient which are used to estimate the water film thickness in annular mist flow. As the results, for the annular-mist flow in very high superficial gas velocity condition, the analytical results of the interfacial friction factor reasonably agreed with the Wallis' correlation for the interfacial friction factor which was developed purely based on the experimental data. And the calculated results of wall friction factor agreed with the equation for the laminar flow. This reason is supposed that the liquid film thickness is very thin less than transition region in the annular-mist flow under high superficial gas velocity. Furthermore, it was indicated that Kataoka's correlation for droplet diameter is applicable for the prediction of drag force.
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