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 4
Displaying 1-8 of 8 articles from this issue
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  • A New Powder-Supply Method Using a Hopper with a Vibrating Coil Spring
    Makoto SAITO
    1992 Volume 29 Issue 4 Pages 248-253
    Published: April 10, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.29.248
    JOURNAL FREE ACCESS
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    The vibrating feeder which has generally been used has its flow control devices installed on the outside of the hopper discharge.
    This paper presents a new simple control system which involves a vibrating coil spring attached to the discharge opening of the hopper to quantitatively supply powder.
    The powder supply experiments were conducted by using granular materials having good fluidity. The effects of vibrational frequency and amplitude on the flow rate were investigated. The results of the experiments revealed that the powder could be easily supplied and its flow rates changed by adjusting vibrational velocity.
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  • Infiltration of Chloride Reduced Particles within a Ceramic Packing as a Method of Forming Inclined Concentration Layers
    Hidetoshi MORI, Eiichi ISHIKAWA, Won-doek YI, Masaaki NAKAMURA, Shigek ...
    1992 Volume 29 Issue 4 Pages 254-260
    Published: April 10, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.29.254
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    Formation of inclined concentration layers was studied with the intention of providing a fundamental idea for manufacturing functionally gradient materials. Metallic chlorides were reduced by hydrogen in a silica tube, and the produced metallic fine particles were subsequently infiltrated within a ceramic packing placed in the same tube. The cut section of subjected packing was observed with SEM, and the ratios of metal-to-ceramics were graphically determined at various positions.
    The experiment using nickel chloride and alumina packings proved that inclined concentration layers were sufficiently formed, and their gradients were easily controlled by changing the flow rate of purge gas and the conditions of the packing. The infiltration process was also successively simulated with a theory of mechanical separation which allowed the design of the optimal processing.
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  • Study on Influence of Friction Coefficients on the Behavior of Granular Materials in Silo during Discharge using the Distinct Element Method
    Jun YOSHIDA
    1992 Volume 29 Issue 4 Pages 261-268
    Published: April 10, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.29.261
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    The inside pressure of a silo, especially the dynamic pressure during discharge is a very important factor in its structural design. However, numerical simulations of this problem have seldom been preformed because of their complexity. In previous papers, it was shown that the distinct element method (DEM) is suitable to apply to this problem. In this report, the characteristic distributions of the pressures on silo walls in the steady state and during discharge are studied using a DEM simulation, and the influence of friction coefficients is mainly examined. A result of this study is that the pressure distributions in the steady state from the DEM simulation are similar to the theoretical or experimental ones. A pressure increase during discharge is observed. However, the model used in this study is very rough and small compared to practical ones, but it can be used to simulate the complicated behaviors of granular materials during discharge in real silos.
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  • Change in the Impeller Torque with the Progress of Spherical Agglomeration in an Agitated Vessel
    Hitoshi TAKASE, Kazuhiko SANAMI, Masunori SUGIMOTO
    1992 Volume 29 Issue 4 Pages 269-275
    Published: April 10, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.29.269
    JOURNAL FREE ACCESS
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    The relationship between the progress of spherical agglomeration in an agitated vessel and the change in the impeller torque was investigated experimentally. The spherical agglomeration was carried out by the addition of 20wt%-CaCl2 aqueous solution as the bridging liquid into a CaCO3 powder-CCl4 slurry. The impeller torque increased with the size of agglomerates in the slurry. It is considered that the increment of the impeller torque with the size of the agglomer-ates was partially contributed by that of torque loaded by the collision between the agglomerates and the impeller blade. The torque correlated well in terms of concentration of CaCO3 powder in the slurry and 50% diameter of the agglomerates.
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  • What's the Drying Characteristics
    The Short-Cut Method and Determination of the Moisture Diffusivity
    Hironobu IMAKOMA, Morio OKAZAKI
    1992 Volume 29 Issue 4 Pages 276-280
    Published: April 10, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.29.276
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  • [title in Japanese]
    Manabu SHIMADA
    1992 Volume 29 Issue 4 Pages 293-294
    Published: April 10, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.29.293
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  • [title in Japanese]
    Kouichi IINOYA
    1992 Volume 29 Issue 4 Pages 295-296
    Published: April 10, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.29.295
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Shigeru ITAI
    1992 Volume 29 Issue 4 Pages 297-299
    Published: April 10, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.29.297
    JOURNAL FREE ACCESS
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