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 36, Issue 10
Displaying 1-6 of 6 articles from this issue
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  • Motion Characteristics of Fine Particle Assembly in Laterally Vibrated Box under Microgravity
    Yasushi OHYAMA, Hiromi TAKEUCHI, A. T. PYATENKO, Shigeo CHIBA, Izumi U ...
    1999 Volume 36 Issue 10 Pages 742-749
    Published: October 10, 1999
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.36.742
    JOURNAL FREE ACCESS
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    This paper describes behavior of fine particles in a laterally vibrated box under microgravity and shows the effects of vibrating conditions and particle concentration on the behavior. A drop capsule yielded microgravity for 10 seconds. Particles of 51μm in mass median diameter flew upward along with each side wall vibrating at 75-150Hz and were dispersed into the central part of the box. The propagation rate of momentum in the particles from the vibrating walls was determined by the frequency and the particle concentration in the dispersed phase. For a small loading mass, static clusters were formed due to restricted propagation of momentum. However, the propagation was enhanced to generate dynamic clusters which were transitional assemblies of the moving particles at a high particle concentration or at a high frequency. It was found that there exists a saturating concentration of dispersed particles in a fully developed vibrating state. High particle concentration leads to a supersaturation and therefore bed reformation from the dispersed particles.
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  • Experimental Study on Collection Performance of Cylindrical Cyclone
    Yasuyuki SHII, Tsutomu NOZAKI
    1999 Volume 36 Issue 10 Pages 750-755
    Published: October 10, 1999
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.36.750
    JOURNAL FREE ACCESS
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    In order to reduce the size of cyclone, especially to shorten its height, a new cylindrical cyclone with a separating plate without tapered section is proposed. We experimentally investigated the influences of opening diameter in the separating plate and the clearance between separating plate and cylinder bottom as well as the inlet velocity on the collection efficiency. As a result, it was found that the separating plate markedly enhances the collection efficiency of cyclone and the particles larger than 10μm are completely collected by the cyclone proposed in the present work.
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  • Evaluation of Mixing Performance of Adhesive Fine Powders in a Tumbling Fluidized Bed Granulator equipped with an Opposed Pulsed Jet Assembly
    Hiroyuki TSUJIMOTO, Toyokazu YOKOYAMA, Isao SEKIGUCHI
    1999 Volume 36 Issue 10 Pages 756-767
    Published: October 10, 1999
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.36.756
    JOURNAL FREE ACCESS
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    Quantitative evaluation of mixing performance of a tumbling fluidized bed granulator with an opposing pulsed jet (PJ) assembly was conducted using an optical sensor and adhesive fine powders. The effects of operating conditions on the degree of mixing were investigated in terms of the ratio of light intensity reflected from the powder mixture to that in the ultimately dispersing state, ηI. The mixing performance was compared to that of other mixers of different types from the viewpoints of the degree of mixing ηI, and the energy consumption during processing. The mixing performance was equal to or higher than that of a high speed stirring mixer. The energy consumption to attain the index ηI of 0.95 using the fluidized bed granulator with the PJ assembly was approximately 50% of that required by the high speed stirring mixer.
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  • Dense Phase Pneumatic Conveyance of Powder in Inclined Pipes by a Nemo Pump
    Mitsuo MATSUDA, Nobuaki SUGIMOTO, Yoshinobu MORIKAWA
    1999 Volume 36 Issue 10 Pages 768-771
    Published: October 10, 1999
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.36.768
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  • Key Technology to Create a Recycling Oriented System
    Powder Processing, Mineral Processing and Environmental Impact Assessment
    Shigehisa ENDOH, Hitoshi OHYA, Shigeki KOYANAKA
    1999 Volume 36 Issue 10 Pages 772-779
    Published: October 10, 1999
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.36.772
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  • [title in Japanese]
    Masafumi ARAKAWA
    1999 Volume 36 Issue 10 Pages 780-786
    Published: October 10, 1999
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.36.780
    JOURNAL FREE ACCESS
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