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 3
Displaying 1-8 of 8 articles from this issue
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  • Impact Test of Single Particle Using a Drop Weight Type Apparatus
    PART I Relationship between Impact Energy and Impact Load Produced
    Yoshitaka KUWAHARA, Fumio SAITOH, Saburo YASHIMA
    1982 Volume 19 Issue 3 Pages 157-164
    Published: March 10, 1982
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.19.157
    JOURNAL FREE ACCESS
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    A new impact testing appaatus was constructed for the investigation of single particle crushing under impact load. The apparatus was composed of a drop weight which gives an impact load to the single particle, and of a piezoelectric system for measuring the dynamical load which is produced by the collision between a drop weight and the particle. The impact load was measured quantitatively with various kinds of drop weights and glass beads of five grain sizes as specimens. The main results were as follows: (1) The relationship between the impact energy and the dynamic load produced showed agreed well with Hertz's law of contact. (2) The duration time of impact decreased with the increase of the impact velocity of the drop weight, and these results were consistent with Timoshenko's analysis.
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  • Fluidization of Large Char and Coal Particles
    Toshimasa HIRAMA
    1982 Volume 19 Issue 3 Pages 164-170
    Published: March 10, 1982
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.19.164
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    In order to support the fluidized bed combustion of large size solid fuel, a study of the mixing and fluidization of char (15mm under) and coal particles (25mm under) was conducted using a laboratory-scale fluidized bed. The axial concentration profiles of the char and coal particles were measured under various conditions, and the degree of mixing was evaluated by the mixing index, M, which was defined in the present paper.
    The mixing index M of the char particles approaches unity, i. e. perfect mixing, with the increase in gas velocity or the decrease in bed height. When the excess gas velocity, u0-umf has a constant value, the index M of the char particles is not affected by the difference in the mean diameter of the fluidized particles.
    The degree of mixing of the coal particles is also promoted with the increase in gas velocity. The use of fluidized particles which have a higher bulk density and a higher value of minimum fluidizing velocity can restrict the deposition of the coal particles on the distributor plate.
    Several design factors for the fluidized bed combustor of large size solid fuel are also discussed on the basis of the present results.
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  • Algorithm for Measurement and Analysis of Particle Shape
    Yoshikazu KUGA, Shigehisa ENDOH, Jiro KOGA, Kenji YAMAGUCHI
    1982 Volume 19 Issue 3 Pages 171-182
    Published: March 10, 1982
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.19.171
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    Profile data for solid particles were automatically measured by a x, y-direction scanning device. The data of several fundamental figures were simulated by the digital computer. The perimeter length, area, unrolled diameter, Feret's diameter and Fourier coefficients of the profile line were determined from those data. The procedure of data treatment consisted of border following, smoothing, interpolation and so on. The error of those geometric quantities depended on the intervals of the scanning line and some kinds of data treatment algorithms.
    For the periphery diameter, the accuracy (difference between computed and true values) was 1.00±0.04 and the precision (reappearency) was 1.00±0.02 when the number of divisions was about 100. For the area, unrolled and Feret's diameters, the error was 1% under the same conditions. A series of Fourier coefficients of a profile line or a particular group of them could be adopted as shape indices.
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  • [title in Japanese]
    Norio OUCHIYAMA, Tatsuo TANAKA
    1982 Volume 19 Issue 3 Pages 183-190
    Published: March 10, 1982
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.19.183
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  • Erratum to : Studies on the Impact Fracture of Glass Beads by the Shot Life Tester
    1982 Volume 19 Issue 3 Pages 196a
    Published: 1982
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.19.3_196a
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  • Erratum
    1982 Volume 19 Issue 3 Pages 196b
    Published: 1982
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.19.3_196b
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  • Erratum to : Effect of Agglomeration Phenomenon on Adhesion Force of Powder Bed
    1982 Volume 19 Issue 3 Pages 196c
    Published: 1982
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.19.3_196c
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  • [title in Japanese]
    Ikuo TAMORI
    1982 Volume 19 Issue 3 Pages 197-198
    Published: March 10, 1982
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.19.197
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