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 4
Displaying 1-5 of 5 articles from this issue
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  • Impact Test of a Single Particle usiug a Drop Weight Type Apparatus (II)
    Fracture Probability and Fracture Load of Particle
    Yoshitaka KUWAHARA, Fumio SAITO, Saburo YASHIMA
    1982 Volume 19 Issue 4 Pages 211-218
    Published: April 10, 1982
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.19.211
    JOURNAL FREE ACCESS
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    The fracture probabilities and the fracture load, under an impact load, of specimens of glass beads of five grain sizes were measured with a newly constructed impact testing apparatus. The main results are as follows: (1) The relationship between the fracture probability (Pf) and the impact energy (E) is expressed by the following equation; Pf=1-exp.[-(E/E0)1.5]; (2) The fracture probability of the particle increases proportionally with the value of Young's modulus of the drop weight; (3) The distribution of the fracture load of the particle shows good agreement with Weibull's distribution function; and (4) The values of Weibull's modulus are decreased and the mean fracture load of the particle are increased with an increase in the impact velocity of the drop weight.
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  • Pressure Drop in a Horizontal Pneumatic Conveyance Transporting Solid Particles Consisting of Different Sizes
    Sadao SAKAMOTO, Yoshinobu MORIKAWA
    1982 Volume 19 Issue 4 Pages 219-225
    Published: April 10, 1982
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.19.219
    JOURNAL FREE ACCESS
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    This paper deals with the pressure drop in horizontal pipelines, through which solid particles consisting of two different sizes are conveyed.
    Two kinds of glass beads, the mean diameter of which are 0.45mm and 1.85mm respectively and the mean density of each is 2500kg/m3, were used.
    The following results are obtained: When grounded brass pipelines are used, the differences between the pressure drops caused by large and small conveyed particles are in inverse proportion to the mean air velocity and particle mass flow-rate. When large and small particles are simultaneously conveyed, the pressure drop increases at a particle supply ratio of 50-75%.
    When acrylic pipelines are used, the material and boundary condition of the pipes and the particles extremely affect the pressure drop. The effects of particle size are not evident in the acrylic pipelines. When large and small particles are simultaneously conveyed, the pressure drop decreases by mixing small particles with large particles. With a large mass flow rate (5kg/min), the pressure drops rise in the vicinity of a supply ratio of 50%.
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  • The Effect of Filling Methods on Wall Pressure Distribution in a Bin
    Ryuichi MORIYAMA, Nobuo HAYANO, Tomosada JOTAKI
    1982 Volume 19 Issue 4 Pages 225-231
    Published: April 10, 1982
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.19.225
    JOURNAL FREE ACCESS
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    Although the analyses of wall pressure distribution in a bin have been reported already by Janssen, Jenike, Walker and Walters, it seems that the results do not always well agree with the experimental ones. Therefore, experimental study is needed to clarify the mechanism of pressure.
    In this paper, the authors measured the wall pressures by different methods of filling a bin with bulk solids. The results obtained are as follows:
    The wall pressures in the flowing and static states differ greatly due to the difference of the filling conditions in a bin which change with the filling methods.
    In the case of granular materials, fed into the central part in a bin, the flow becomes a perfect mass-flow type. But, that of the peripheral feed becomes an imperfect one, when a definite pulsating pressure is produced at a transition in a bin, and the pressure becomes higher than that of the central feed.
    In the case of powder, the flow properties reverse the tendency against that of granular materials, that is, the flow for peripheral feed does not become perfect mass-flow type, while that of central feed is a perfect one.
    Walters' theory differs from these experimental results both statically and dynamically, especially, at the cylindrical section near a transition in a bin. The actual pressure increases more than the theoretical value. These reasons are explainted by observaitons of flow-patterns using a half cylindrical vessel, and measuring the bottom pressure in a flat bin.
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  • [title in Japanese]
    Norio OUCHIYAMA, Tatsuo TANAKA
    1982 Volume 19 Issue 4 Pages 232-243
    Published: April 10, 1982
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.19.232
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  • [title in Japanese]
    Jiro KOGA
    1982 Volume 19 Issue 4 Pages 244-246
    Published: April 10, 1982
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.19.244
    JOURNAL FREE ACCESS
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