Journal of the Society of Powder Technology, Japan
Online ISSN : 1883-7239
Print ISSN : 0386-6157
ISSN-L : 0386-6157
Search
Advanced search
OR
Browse
Search
Volume 43, Issue 8
Displaying 1-8 of 8 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • Continuous Fine Particle Classification by Water-Elutriator with Applied Electro-potential
    Hideto Yoshida, Kunihiro Fukui, Tetsuya Yamamoto, Ayumi Hashida, Norih ...
    2006 Volume 43 Issue 8 Pages 550-558
    Published: August 10, 2006
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.43.550
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    In order to classify fine particles in slurry continuously, a horizontal type water elutriator with electro potential is newly developed. The experimental classification performance was compared with the numerical calculation. Test particles used were pure silica particles with the mass median diameters of 3.5 and 2.5μm.
    The effects of inlet flow rate, slurry concentration, applied electro-potential and the shape of inlet on the classification performance were also studied. The classification accuracy increased by applying the electro-potential and the cut size decreased with an increase in the electro-potential. The classification performance with a three-layer inlet was higher than that with a two-layer inlet.
    The experimental data agreed well with the numerical calculation. It is further shown that the 50% cut size was about 1μm for a relatively short time, and the newly developed water elutriator is, therefore, effective for the classification of fine particles in slurries.
    View full abstract
    Download PDF (3432K)
  • Measurement of Particle Flow-rate by Monitoring Static Electricity under Various Vibration Conditions
    Kazuya Gushima, Takahiro Tomioka, Hiroshi Sakamoto, Kaoru Ohno, Minoru ...
    2006 Volume 43 Issue 8 Pages 559-566
    Published: August 10, 2006
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.43.559
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    This paper is concerned with a newly developed measurement technique of particle flow-rate in gas-solids pipe flow based on the static electrification of particles. The method is found to be feasible to detect the flow-rate as small as 0.5g/s for large alumina particles of 0.3mm in mass median diameter. Here we investigated the effect of sensor vibration on the detection sensitivity to obtain the fundamental data for practical applications of the sensor in various particulate processes such as sand blasting. The jet tests with alumina particles were carried out using a vibration exciter at various frequencies and amplitudes. According to the experiments, it was found that the detection sensitivity increases with the vibration and the sensor can be applied even when the acceleration of vibration is as large as 30G. It was also found that the resonance of the sensor vibration has no significant influence on the measurement of particle flow-rate.
    View full abstract
    Download PDF (1074K)
  • Control of Apparent Specific Gravity in Binary Particle Systems of Gas-Solid Fluidized Bed
    Mikio Yoshida, Jun Oshitani, Keiko Ono, Miki Ishizashi, Kuniaki Gotoh
    2006 Volume 43 Issue 8 Pages 567-576
    Published: August 10, 2006
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.43.567
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Fluidized bed medium separation (FBMS) was applied to separate objects with a small specific gravity difference by precisely controlling the apparent specific gravity of gas-solid fluidized bed with binary particle systems. The binary systems of particles with various specific gravities and diameters were employed, and the apparent specific gravity of fluidized bed, gfb and the dispersion, Δgfb, were measured by changing the bulk volume fraction of heavier particle, Vhp, and the superficial air velocity, u0. It was found that gfb can be controlled by Vhp and u0 because gfb varies with the total mass of particles and the bed expansion. On the other hand, since Δgfb is determined by the extent of segregation of fluidized particles and the fluidization intensity, Δgfb decreases with reducing the extent of the segregation and the vertical fluctuation of fluidized bed surface. The experimental results showed that practical fluidized conditions for FBMS are in the range of gfb≈0.5-3.8 and Δgfb≤0.1. Under these fluidized conditions, plastics with a small difference in specific gravity (0.04-0.24) were almost completely separated at the top and the bottom of the fluidized bed.
    View full abstract
    Download PDF (1313K)
  • Pulverization Technique of Wood Biomass and Development of Utilization Processes of Wood Powder
    Shigekatsu Mori, Yoshinori Itaya, Nobusuke Kobayashi
    2006 Volume 43 Issue 8 Pages 577-584
    Published: August 10, 2006
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.43.577
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    In this paper, latest development on the effective utilization processes of wood powder is expounded. First, effective pulverization techniques with a vibration mill and the pulverized wood powder characteristics are explained. Second, the biomass utilization processes using the wood powder, such as gasification process, combustion process and liquefaction process are discussed. Highly reactive wood powder as a starting material in these processes leads to high performance of process. Finally, the wood biomass powder utilization system is introduced for the practical application. The system is a combined process, which produces heat, electric power and new materials through the gasification, combustion, liquefaction and other processes of wood powders.
    View full abstract
    Download PDF (3414K)
  • Structural Design of Solid-Solid Interfaces in Fabrication Processes for Nano-composites
    Yoshiyuki Shirakawa
    2006 Volume 43 Issue 8 Pages 585-589
    Published: August 10, 2006
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.43.585
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Design of grain boundaries is indispensable for the development of new functional materials fabricated from nano-particles. The structural property of the grain boundary is the dominant factor for determining the physical and chemical phenomena, and the interfacial region of the grains serve as ionic transport and chemical reaction fields. In this report, computer simulations of ionic conduction and hydrogen reaction at the interfaces are illustrated. The simulation technique is a useful tool for designing functions of materials made of many grains.
    View full abstract
    Download PDF (3001K)
  • Dynamics of Fluctuation in Formation Process of a Sandpile
    Chiyori Urabe
    2006 Volume 43 Issue 8 Pages 598
    Published: August 10, 2006
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.43.598
    JOURNAL FREE ACCESS
    Download PDF (1525K)
  • Report of 8th Japan-Australia Colloid Science Gakkai
    Jun Oshitani
    2006 Volume 43 Issue 8 Pages 599-600
    Published: August 10, 2006
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.43.599
    JOURNAL FREE ACCESS
    Download PDF (2343K)
  • Activity Report of Working Group on Particle Charge Control
    Shuji Matsusaka
    2006 Volume 43 Issue 8 Pages 602
    Published: August 10, 2006
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.43.602
    JOURNAL FREE ACCESS
    Download PDF (127K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top