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 21, Issue 1
Displaying 1-8 of 8 articles from this issue
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  • Measurement of Particle Orientation Distribution by a Stereological Method
    Ken-ichi KANATANI
    1984 Volume 21 Issue 1 Pages 3-10
    Published: January 10, 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.21.3
    JOURNAL FREE ACCESS
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    The anisotropic characteristics of a composite material are determined by the particle orientation distribution in it. In this paper, practical procedures are described for the stereological method which determines the spatial distribution of particle orientation from the distribution observed on cross sections. First, the distribution of needle-like particles on a plane is determined by counting the number of intersections with parallel probe lines. Next, the distribution of needle-like particles in the space is deterimined by counting the number of intersections with a cutting plane. Then, the distribution of disk-like paricles in the space is determined by counting the number of intersections with a probe line. Finally, the distribution of disk-like particles in the space is determined by measuring the total length of the cross sections on a cutting plane.
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  • Effect of Powder Properties in the Fractional Recovery Curves in a Fine Particle Size Air Classifier
    Tea Soo SUH, Tomohjko SHIBATA, Jun-ichiro TSUBAKI, Genji JIMBO
    1984 Volume 21 Issue 1 Pages 11-17
    Published: January 10, 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.21.11
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    By the use of an Alpine Mikroplex classifier which is one of the typical fine particle size air classifiers, the classifier's classification mechanism was systematically analyzed paying attention to several different operating variables and characteristics of classification, as well as powder properties.
    As the results, it was found that a repulsion phenomenon of particles on the vane plays an important role in the classifier process. It was also proven that Rumpf's equation giving cut size is useful when the thickness of the vane is taken into account.
    By comparing these results, it is concluded that a Mikroplex Classifier has a different working mechanism both in the coarse and the fine ranges of the particle size of the fractional recovery curve. From this finding, it is confirmed that the Mikroplex classifier has a working mechanism different from a Sturtevant-type air classifier.
    Finally, in the relationship between the powder properties and the characteristics of the classification, it was found that powder properties had a good relationship with the ratio of partition, to the coarser products β, i. e., the higher the flowability and the floodability of powder, or the lower the adhesion of powder, the smaller the values β are.
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  • Prevention of the Scattering of Storaged Granular Materials in the Wind
    Takeshi KANO, Fumiaki TAKEUCHI, Katsushi JINNO, Akihito FUJIWARA
    1984 Volume 21 Issue 1 Pages 18-24
    Published: January 10, 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.21.18
    JOURNAL FREE ACCESS
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    In recent years, a large guantity of granular materials such as coal is storaged in the form of outdoor piling in Japan. Therefore, the development of a method to prevent or reduced their scattering due to wind is required.
    In this study, the air velocity distributions around model heaps of several types and the amount of the scattered particles from various parts of the heap are investigated using granulated palmetto charcoal as the test material.
    It is shown, both experimentally and theoretically, that the air velocity takes the maximum value at the edye of the upstream side, from where the air flow scatters the particles most intensively.
    In conclusion, it is found that the pedestal form of the heap with the low height is the most favorable to minimize the scattering and that the spraying of pure water of a mass of 2l/m2 or 0.3% Coal dust control agent aqueous solution at a mass of 0.75l/m2 onto the edge of the heap is effective in preventing scattering.
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  • Analogy of Mass, Heat and Momentum Transfer between Particle and Fluid
    Haruo WATANABE
    1984 Volume 21 Issue 1 Pages 25-29
    Published: January 10, 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.21.25
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  • [title in Japanese]
    Jun-ichiro TSUBAKI
    1984 Volume 21 Issue 1 Pages 30-39
    Published: January 10, 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.21.30
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  • [title in Japanese]
    [in Japanese]
    1984 Volume 21 Issue 1 Pages 40-41
    Published: January 10, 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.21.40
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
    1984 Volume 21 Issue 1 Pages 42-50
    Published: January 10, 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.21.42
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  • [title in Japanese]
    Mitsunobu MORITA
    1984 Volume 21 Issue 1 Pages 51-53
    Published: January 10, 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.21.51
    JOURNAL FREE ACCESS
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