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 44, Issue 12
Displaying 1-7 of 7 articles from this issue
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  • Development of an Exponential Sampling Correlator with Lagged Fibonacci Series for Polydisperse Nanoparticles
    Tetsuji Yamaguchi, Shigeyuki Kawarabayashi, Kikuo Okuyama
    2007 Volume 44 Issue 12 Pages 846-851
    Published: December 10, 2007
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.44.846
    JOURNAL FREE ACCESS
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    Correlator of a photon correlation spectroscopy (PCS) apparatus for measuring nanoparticles with a polydisperse distribution has been developed with unique data sampling methods. In the present exponential sampling correlator, the sampling times are increased by various geometrical ratios, each of which relates the integral multiples of minimum sampling time to the individual channels. The geometrical progressions are able to transform the data into the lagged Fibonacci series. Simulation results show that the newly developed correlator has an improved performance over the conventional exponential sampling correlator because no rounding errors occur in the processing of the data.
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  • The Effects of Stress Ratio on Estimated Results of Powder Pressure
    Kazuhiko Takenaka, Kenji Iimura, Michitaka Suzuki, Mitsuaki Hirota
    2007 Volume 44 Issue 12 Pages 852-860
    Published: December 10, 2007
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.44.852
    JOURNAL FREE ACCESS
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    Janssen's equation is widely used to calculate the powder pressure in a silo. Physical properties necessary for the powder pressure calculation are bulk density, wall friction factor and stress ratio. In the physical properties, bulk density and wall friction factor can be measured directly by the mechanical tests of the powder. But the stress ratios are evaluated indirectly from the Yield Loci of powder beds. Therefore, if the evaluated results of stress ratios differ by the approximation methods of a yield locus, it would be considered that the approximation methods affect the calculated results of powder pressures. But few studies on the effects of approximation method of Yield Locus on stress ratios can be found.
    In this paper, we describe Yield Locus from shear test results by Coulomb's equation, Warren-Spring's equation and our proposed equation and evaluate stress ratios. We also evaluated the stress ratio using the equation recommended by ISO and compared it with other methods. Furthermore, we calculated the powder pressure in a silo from the stress ratios by Janssen's equation. These calculated results are compared with experimental results and the effectiveness of our proposed equation is confirmed.
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  • Experimental and Computational Study of Classification of Particles by Improved Centrifugal Separator
    Tetsuya Yamamoto, Toshie Kotani, Kunihiro Fukui, Hideto Yoshida
    2007 Volume 44 Issue 12 Pages 861-867
    Published: December 10, 2007
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.44.861
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    This study investigated the particle classification performance of an improved centrifugal separator. The improvements made in the centrifugal separator were the installation of another outlet near the wall of the conventional centrifugal separator and a ring partition in the outlet tube. As a result, it was found that 95% cut size of the centrifugal separator was lowered by reducing the ratio of fine particle's flow rate to the total flow rate because large fraction of coarse particles were collected into the outlet tube near the wall. The ring partition improved the particle classification performance because it prevented the mixing between fine and coarse particles. These experimental results were qualitatively in agreement with the predictions by the computational simulation.
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  • Classification Characteristics of Backward Sampling and Its Application to Particle Size Distribution Measurement
    Hirofumi Tsuji, Hisao Makino, Hideto Yoshida
    2007 Volume 44 Issue 12 Pages 868-873
    Published: December 10, 2007
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.44.868
    JOURNAL FREE ACCESS
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    This article reviews the advanced measurement methods for particle size distribution in gas- particle flow by use of backward sampling. These methods utilize the classification effect during the backward sampling, in which the inlet of sampling probe is faced downstream to the main flow. Fine particles of less than few microns are selectively aspirated into the sampling probe during the backward sampling. The classification effect and the procedure to measure particle size distribution are summarized. This review also presents the application results of these methods for the particle size distribution measurements of dusts generated in a pulverized coal combustion test furnace.
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  • Doctoral Thesis Introduction
    2007 Volume 44 Issue 12 Pages 881-882
    Published: December 10, 2007
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.44.881
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  • Overseas Report
    2007 Volume 44 Issue 12 Pages 883-886
    Published: December 10, 2007
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.44.883
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  • Activity Report of Division of Particulate Preparation and Design
    Hirofumi Takeuchi
    2007 Volume 44 Issue 12 Pages 887
    Published: December 10, 2007
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.44.887
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