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 27, Issue 8
Displaying 1-9 of 9 articles from this issue
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  • Flow Characteristics in a Horizontal Pneumatic Conveyance at Low Fluid Velocities (Part III)
    Additional Pressure Drop and the Friction Factor
    Mitsuaki OCHI
    1990 Volume 27 Issue 8 Pages 510-514
    Published: August 10, 1990
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.27.510
    JOURNAL FREE ACCESS
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    In the present paper, a fundamental equation for the friction factor of an additional pressure drop due to solid particles is first derived based on the observed flow pattern of solid particles reported in the previous study ( Part I) on an established flow at low fluid velocities in horizontal pipes. Next, an empirical equation for the friction factor is obtained by the substitution of the parameter of the gravitational force and the velocity ratio between solid particles and fluid determined in the previous study (Part II) into the foregoing equation; and the empirical equation thus derived shows high accuracy as more than 95% of predicted values agree with this experimental data within the error of ±20%.
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  • Effect of Powder Feed Rate and Rotational Speed of Impeller on the Performance of a Mixer-type Disperser
    Hiroaki MASUDA, Satoshi KAWAGUCHI, Kuniaki GOTOH
    1990 Volume 27 Issue 8 Pages 515-519
    Published: August 10, 1990
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.27.515
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    An experimental study of the performance of a mixer-type particle disperser was carried out with particular attention to the effect of the rotational speed of the impeller and powder feed rate. The operational ranges for obtaining fully dispersed aerosol flow were also investigated.
    The aerosol flow discharged from the disperser was classified into three modes: homogeneous, degenerate, and slug-flow depending on the operational conditions. It was found that fully dispersed aerosol was obtained only when the flow was homogeneous. It was also found that the amount of particles deposited on the inside wall increased with decrease in the impeller's rotational speed and/or increase in the powder feed rate, and the mode of the deposition gradually changed from speckled to layered deposition through wavy deposition. The disperser should be operated under the speckled deposition-mode so as to obtain fully dispersed aerosol flow.
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  • Flow Behavior of a Wet Particle Fluidized Bed
    Mitsuyuki NAKAJIMA, Yoshinori OTA, Ryohei YAMAZAKI, Genji JIMBO
    1990 Volume 27 Issue 8 Pages 520-525
    Published: August 10, 1990
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.27.520
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    Experiments on fluidizing characteristics of moist particles were carried by using humidified air as a fluidizing gas.
    Changes in the fluidizing state were examined by measuring the pressure drop of beds and by visual observation in a semicylindrical fluidized bed. Changes in minimun fluidizing velocity, umf and corresponding voidage, εmf were also measured.
    The quality of fluidization that depended on the moisture content was classified into three regions by using umf, εmf and the channeling index defined in this work. In addition, these characteristic values were obtained as functions of moisture content, particle size, bed height and gas velocity.
    Channeling phenomena were also discussed in term of angle of repose of powder beds.
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  • Comparing Applicability of the Models to the Powder Reaction Rate Controlled by a One-way Diffusion Process
    Akira SHIMIZU, Yu-Jun HAO, Junji SAITOU
    1990 Volume 27 Issue 8 Pages 526-533
    Published: August 10, 1990
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.27.526
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    With some powder reactions controlled by a unidirectional diffusion process, the validity of the two models of Ginstling-Brounshtein and Hao-Tanaka was examined by the use of experimental data of conversion with lapse in time. When a suitable model for a specific reaction is required, only the conventional linear plot of the reaction rate data is not sufficient. Theoretical reaction curves should be simulated by these models with the change in particle size as well as the mole ratio.
    Actual powder reaction rates of Fe2O3-V2O5 and Al2O3-ZnO systems are quantitatively correlated with the number of the contact points between two component particles. More than 670 diffusing component particles contacted a non-diffusing component particle. In spite of such a large number of diffusing component particles, the traditional spherical shell model of Ginstling-Brounshtein is not valid in both systems.
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  • Controlled Release Microcapsule Dosage Form using Biodegradable Polymers Containing a Water-Soluble Peptide
    Yasuaki OGAWA
    1990 Volume 27 Issue 8 Pages 534-540
    Published: August 10, 1990
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.27.534
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  • Contamination in a Processing of Advanced Ceramics
    Masaaki YANAGISAWA, Jun-ichiro TSUBAKI
    1990 Volume 27 Issue 8 Pages 541-548
    Published: August 10, 1990
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.27.541
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  • [title in Japanese]
    Kum-Chan CHOI
    1990 Volume 27 Issue 8 Pages 549-550
    Published: August 10, 1990
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.27.549
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1990 Volume 27 Issue 8 Pages 551-555
    Published: August 10, 1990
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.27.551
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Kenichi YOSHIE
    1990 Volume 27 Issue 8 Pages 556-557
    Published: August 10, 1990
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.27.556
    JOURNAL FREE ACCESS
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