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 18, Issue 5
Displaying 1-7 of 7 articles from this issue
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  • Study on the Measurement of Capillary Suction Time
    Kozaburo UEDA, Masaharu MOTONE, Naoya YOSHIOKA
    1981 Volume 18 Issue 5 Pages 287-294
    Published: May 10, 1981
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.18.287
    JOURNAL FREE ACCESS
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    The method for the measurement of Capillary Suction Time is analyzed under the consideration of solid settling velocities, and CSTB and RCST are proposed as the new indices in the filtration of sludge or slurry. The former depends upon the liquid properties-viscosity, surface tension and equivalent capillary diameter, while the latter depends mainly upon the solid ones-specific cake resistance and solid concentration besides the equivalent diameter of the filter paper.
    The relationship between CST or RCST and αm are diagramatically expressed under the standard data of a CST meter and its filter papers which are identified by the liquid suction test. So these graphs may be applied to estmate the specific cake resistance from experimental CST or RCST data.
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  • Sizing Technique of Water and Salt-water Solution Droplets: NGB (Dye)-gelatin Film Method
    Ken-ichi USHIKI, Masafumi IMOTO, Seiji HANATANI, Koichi IINOYA
    1981 Volume 18 Issue 5 Pages 295-301
    Published: May 10, 1981
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.18.295
    JOURNAL FREE ACCESS
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    A Naphthol Green B (NGB) dyestuff gelatin film, coated on a slide glass, can be used for determining the size distributions of water or salt-water solution droplets. The stain sizes that remained after the evaporation of droplets that impacted a slide glass, are calibrated by using the solid particle tracer method, the silicone oil film method and the two-stages cascade impactor. The following results are obtained experimentally: 1) The calibration results using these three different methods agree well with each other, and the diameter of the droplets are 0.54 times the diameter of the stains, on the average; 2) The value 0.54 is almost independent of the droplet diameters, the concentration of NGB dyestuff and the velocity of the approaching droplet velocity within the experiment range; 3) The value of the ratio for 4% salt-water solution droplets is almost the same as that of water droplets; and 4) The best composition of gelatin sol is 10ml of distilled water, 0.5g of NGB dyestuff and 0.6g of dried gelatine.
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  • Generating Mechanism of Harmonic Sound from Singing Sand
    Jusuke HIDAKA, Shigeo MIWA
    1981 Volume 18 Issue 5 Pages 301-310
    Published: May 10, 1981
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.18.301
    JOURNAL FREE ACCESS
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    The mechanism causing the generation of harmonic sound from singing sand into which a rod penetrates is investigated experimentally. Stick-slip behavior distinctly occurs on compression flow of the singing sand, which is the reason for generation of the harmonic sound. The stick-slip friction characteristic of a singing sand is measured with a penetration test for a packed bed of particles.
    The relationship between material of the penetrating rod, the stick-slip friction characteristic of the singing sand and the nature of the sound from the singing sand are discussed. The mechanism by which the harmonic sound from the singing sand is generated be explained as fllows: When the rod is penetrated into a packed bed of the singing sand, the impulsive force of resistnce to penetration of the rod which occurs from the stick-slip friction acts on the penetrating rod. Therefore, longitudinal vibration of the rod is excited, and the harmonic sound is radiated to in atmosphere. The sound generation based on the friction of particles can be classified into a squeal noise and a rubbing noise related to the friction characteristic of the particles.
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  • [title in Japanese]
    Michio NONAKA
    1981 Volume 18 Issue 5 Pages 311-318
    Published: May 10, 1981
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.18.311
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  • [title in Japanese]
    Yasushige MORI
    1981 Volume 18 Issue 5 Pages 319-321
    Published: May 10, 1981
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.18.319
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  • [title in Japanese]
    [in Japanese]
    1981 Volume 18 Issue 5 Pages 322-324
    Published: May 10, 1981
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.18.322
    JOURNAL FREE ACCESS
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  • Abstracts of papers to be presented at International Symposium on Powder Technology, 81
    1981 Volume 18 Issue 5 Pages 325-360
    Published: May 10, 1981
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.18.325
    JOURNAL FREE ACCESS
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