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 29, Issue 1
Displaying 1-7 of 7 articles from this issue
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  • [title in Japanese]
    Kouichi IINOYA
    1992 Volume 29 Issue 1 Pages 3
    Published: January 10, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.29.3
    JOURNAL FREE ACCESS
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  • Dust Adhesion to a Cyclone Wall at an Elevated Temperature
    Shun-ichi MIZUKAMI, Jun HIROSE, Hiroyuki MURATA
    1992 Volume 29 Issue 1 Pages 4-10
    Published: January 10, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.29.4
    JOURNAL FREE ACCESS
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    The behavior of dust particles in a cyclone at an elevated temperature was analyzed to assess the feasibility of cyclone for hot gas treating processes. First, the gas velocity distribution in a cyclone and particle trajectories were calculated. Then, the adhesive force of the particles to the cyclone wall at an elevated temperature was measured. The results of these analyses showed that particle adhesion tends to occur in the lower part of the cyclone where the gas velocity is relatively low. This was confirmed by an experiment using a cyclone with heated gas and model dust. These results led to a few guidelines for designing hot cyclones without particle adhesion.
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  • The Dispersion Mechanism of a Mixer-type Disperser
    Kuniaki GOTOH, Michiyasu TAKAHASHI, Hiroaki MASUDA
    1992 Volume 29 Issue 1 Pages 11-17
    Published: January 10, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.29.11
    JOURNAL FREE ACCESS
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    The dispersion mechanism of a mixer-type disperser has been studied both experimentally and theoretically. The size distribution of dispersed aerosol particles was measured by a cascade impactor, and the size distribution of primary particles constituting the agglomerated particles on each stage of the impactor was also measured. These size distributions were analyzed to reveal the dispersion characteristics by introducing newly defined partial dispersion efficiency.
    It was found that the dispersibility of agglomerated particles depended both on the size of primary particles and the morphological structure of agglomerated particles. The agglomerates made up of the particles having a size near the mass median diameter were easily dispersed. It was, however, difficult to disperse the particles having their diameters in the tails of the size distribution of the feed powder. These results were well explained by the dispersion model where the dispersion force was mainly supplied by an acceleration of fluid motion. This fact suggests that further improvement is needed in the mixer-type disperser.
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  • The Performance of Granular Bed Filters with Dust Loading
    Hidetoshi MORI, Norio KIMURA, Shigeki TOYAMA
    1992 Volume 29 Issue 1 Pages 18-25
    Published: January 10, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.29.18
    JOURNAL FREE ACCESS
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    The present paper deals with the filtration performace of granular bed filters during dust loading. It is verified that time changes in collection efficiency and dust load distributions in filters can be easily evaluated on the basis of the interception model. In this model, aerosol particles accumulate on a granule surface with a constant porosity, and interception by these particles is the predominant mechanism causing the increase in collection efficiency. The approximate expression representing the average collection efficeiency at a given time is presented, and it is compared favorably with the experiments. It is also shown that pressure loss buildup caused by retained particles can be predicted from the same model, in consideration of the Kozeny flow in a bed.
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  • Arch Formation of Limestone Carried in Cargo Holds of a Self-unloading Ship and Variation of the Flow Properties with Time
    Hiroshi TSUNAKAWA, Takemune NAGATA
    1992 Volume 29 Issue 1 Pages 26-31
    Published: January 10, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.29.26
    JOURNAL FREE ACCESS
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    Arching problems happened in cargo holds of a self-unloading ship which was newly constructed in 1991 in order to carry about 17, 000 tons of limestone. Variation of the flow properties of the cargo with time brought about an arch formation. Actually, results of shear tests for limestone under a time consolidation of 48 hours showed an increase of 120% in a flowability which was expressed by a ratio of the unconfined yield strength to the unit weight.
    The critical arch span was computed from the flowability. Also the span of real arches in cargo holds was estimated from measurements of the height from the hopper outlet to the top of real arches. These results were favourably compared.
    In order to eliminate arching problems of the cargo holds, an installation of a prism shaped insert having 0.774m wide by 1, 855m long was successfully tested on regular runs of the self-unloading ship.
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  • Recent Development in Magnetic Material
    Ken HIROTA, Osamu YAMAGUCHI
    1992 Volume 29 Issue 1 Pages 32-39
    Published: January 10, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.29.32
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1992 Volume 29 Issue 1 Pages 49-66
    Published: January 10, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.29.49
    JOURNAL FREE ACCESS
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