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 37, Issue 10
Displaying 1-8 of 8 articles from this issue
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  • Continuous Synthesis of Monodispersed Alumina Particles by the Hydrolysis of Metal Alkoxide using Taylor Vortex
    Takashi OGIHARA, Nobuo OGATA, Kazumi FUJITA, Syuzaemon SATO, Mamoru NO ...
    2000 Volume 37 Issue 10 Pages 722-727
    Published: October 10, 2000
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.37.722
    JOURNAL FREE ACCESS
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    A continuous reactor was developed for industrial production of monodispersed alumina particles from the metal alkoxide. Taylor vortex flow was used for solution mixing. Individual Taylor vortices served as batch reaction vessels. Monodispersed spherical alumina particles were prepared by the hydrolysis of aluminum alkoxide in the mixture of octanol and acetonitrile. Monodispersed alumina particles were continuously produced for 5h by the reactor. The particle size and distribution were comparable to those obtained by a batch process. The effects of Taylor number (Ta) and residense time on the particle size, particle size distribution, yield, and particle number density of monodispersed alumina particles were investigated. Monodispersed alumina particles were obtained at Ta number from 50 to 150.
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  • Electrification of Fine Particles by Impact on Polymer Film Target
    Shuji MATSUSAKA, Tomonori NISHIDA, Yoshiaki GOTOH, Hiroaki MASUDA
    2000 Volume 37 Issue 10 Pages 728-733
    Published: October 10, 2000
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.37.728
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    Impact electrification between fine particles and polymer film has been investigated both theoretically and experimentally. A powder, fly ash of 12μm in mass median diameter, was dispersed and accelerated in airflow, and then the particles were impacted on a target whose frontal surface was covered with a polymer film and the rear side was a metal plate. The films used were in the range of 25-250μm in thickness. The rear metal plate was grounded and the electric currents caused by impact electrification were measured by an electrometer. Two types of currents were detected, namely induced current and conduction current. The induced current was due to the charge accumulating on the film, while the conduction current was due to the dielectric breakdown arising from the particle impact. Using a film with small artificial holes, conduction current was detected. This fact shows that insulating material can be utilized as an effective charging wall as long as the charge accumulation in the material is well suppressed.
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  • Evaluation of Attrition Characteristics of Granules by Vibrating Sieve Tester
    Application for Attrition Estimation of Granules in a Rotary-Vessel-Type Mixer
    Munetake SATOH, Tomohiro IWASAKI, Namie IKEMOTO, Mamoru DEGUCHI, Tsuyo ...
    2000 Volume 37 Issue 10 Pages 734-741
    Published: October 10, 2000
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.37.734
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    Attrition characteristics of granules were evaluated by using a vibrating sieve tester. The attrition fraction and the rate constant of attrition were measured under various vibrating conditions. An empirical equation of the attrition fraction was presented as functions of the granule strength and the energy consumption of vibration. In order to estimate the amount of attrition for relatively soft granulated materials during mixing operation, we performed mixing tests with an actual rotary-vessel-type mixer and measured the relationship between the attrition fraction and the mixing time. Based on the energy consumption of the mixer, a correlation equation of attrition fraction for the mixer was obtained by considering several experimental correction factors.
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  • A Consideration on the Reentrainment of Dust Particles Accumulated on a Glass Beads
    Takenari TAKESHITA, Jian Ling HUA, Taketoshi OKAMOTO, Shinobu IMAI
    2000 Volume 37 Issue 10 Pages 742-744
    Published: October 10, 2000
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.37.742
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    Morphology of 5-micron fly ash particles accumulated on granules (5-mm glass beads) was observed and photographed by a digital microscope, and the reentrainment of dust particles was qualitatively discussed in the present paper. When the filtration velocity was low, the collision of dust particles was a main cause of reentrainment. As the filtration velocity increases, the drag force and the change in the shape of deposited particles on the granules are the major causes.
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  • Risk Assessment of Environmental Particles
    Isamu TANAKA
    2000 Volume 37 Issue 10 Pages 745-752
    Published: October 10, 2000
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.37.745
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  • Generation of Droplets and Ions by Electrospray
    Kikuo OKUYAMA, I. Wuled LENGGORO
    2000 Volume 37 Issue 10 Pages 753-760
    Published: October 10, 2000
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.37.753
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  • [title in Japanese]
    2000 Volume 37 Issue 10 Pages 761-764
    Published: October 10, 2000
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.37.761
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  • [title in Japanese]
    [in Japanese]
    2000 Volume 37 Issue 10 Pages 765
    Published: October 10, 2000
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.37.765
    JOURNAL FREE ACCESS
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