Journal of the Society of Powder Technology, Japan
Online ISSN : 1883-7239
Print ISSN : 0386-6157
ISSN-L : 0386-6157
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Volume 19, Issue 8
Displaying 1-6 of 6 articles from this issue
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  • Variation of Packing Density in Binary Particle Systems
    Zennosuke TANAKA, Eiji SHIMA, Teruo TAKAHASHI
    1982 Volume 19 Issue 8 Pages 457-462
    Published: August 10, 1982
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.19.457
    JOURNAL FREE ACCESS
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    The variation of particle packing density in binary systems was investigated. The equations for the packing density or voidage of binary particle systems in which the values of the packing density or voidage can be figured out from the size ratio and the volume fraction of coarse are proposed.
    The comparisons of the experimental results and the computed values are shown in Fig. 4 to 9. The experimental values for spherical particles are in good agreement with the equations proposed. For non-spherical or size spread particles, these equations are also valid.
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  • General Analysis of Particle-Segregation Mechanism in Filling Vessels by a Screening Layer Model
    Kunio SHINOHARA
    1982 Volume 19 Issue 8 Pages 462-469
    Published: August 10, 1982
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.19.462
    JOURNAL FREE ACCESS
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    The segregation process is analyzed by a screening layer model with the binary mixture of particles of different size, shape or density. The segregating component permeates through dynamically formed interspaces among the framing particles during flow. Then it is entrained by the upper flowing layer of mixture over the inclined heap surface, where sufficiently smaller particles are packed gradually into the static voids of the heap. The total layer thickness is constant, Whereas the remaining, the segregating and the separated layers vary in their thickness and velocity along the heap line.
    As a result, the zone, where the segregating particles are contained around the feed point in the vessel, expands by an increment of the initial mixing ratio, the feed rate and flow length or the vessel size. The mixing-ratio distribution is also described as a function of such operational variables as well as particle properties.
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  • Collapse of the Wetted Powder Solids by the Rotation of the Side-wall
    Mitsuo YAMASHIRO, Yasunobu YUASA
    1982 Volume 19 Issue 8 Pages 469-474
    Published: August 10, 1982
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.19.469
    JOURNAL FREE ACCESS
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    The collapse phenomena of a powder solids layer are observed frequently in natural disasters such as washouts and snowslides. It is important to make these behaviors clear.
    In this study, two kinds of dried powder solids (carborundam (particle diameter d: 0.505mm) in the odd numbered layers and glass beads (d: ∅ 1.015mm) in the even numbered layers) are packed as parallel layers and the collapsed states obtained by rotating the side-wall are photographed. Furthermore, three kinds of powder solids with water added having different moisture contents are used in the experiment. The effect of the moisture content and the rotating angle on the collapsed state is investigated. Table 4 shows the main rusults.
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  • [title in Japanese]
    Yusaku SHIOJI
    1982 Volume 19 Issue 8 Pages 475-487
    Published: August 10, 1982
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.19.475
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Youichi INOUE
    1982 Volume 19 Issue 8 Pages 488-495
    Published: August 10, 1982
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.19.488
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Yuji YOSHIMURA
    1982 Volume 19 Issue 8 Pages 496-497
    Published: August 10, 1982
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.19.496
    JOURNAL FREE ACCESS
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