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 28, Issue 8
Displaying 1-5 of 5 articles from this issue
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  • Cut Size Estimation in Centrifugal Air Classifiers
    Mitsuhiro ITO
    1991 Volume 28 Issue 8 Pages 488-494
    Published: August 10, 1991
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.28.488
    JOURNAL FREE ACCESS
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    Two methods of cut size estimation, statistical and theoretical, of a centrifugal air classifier were investigated. A simple empirical formula for the cut size was statistically derived from 161 sets of actual data. This formula was also applicable to the classifier having 10, 000 times the capacity.
    On the other hand, the theoretical cut size derived from a particle trajectory is smaller at the range of over 10μm than actual data. It was considered that this phenomenon resulted from the behavior of particles based on their inertia, such as the initial velocity of particles in the radial direction in the classifier.
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  • The Relationship Between Fiber Length and the Penetration Rate of Fibrous Aerosol Tthrouih Wire Mesh Screens
    A New Method for Measuring Median Fiber Length
    Toshihiko MYOJO
    1991 Volume 28 Issue 8 Pages 495-500
    Published: August 10, 1991
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.28.495
    JOURNAL FREE ACCESS
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    Wire mesh screens were used as a length classifier of fibrous aerosol. The penetration rates of fibrous aerosol were simulated by means of the Monte Carlo method. The penetration rates depend only on the interception parameter, that is, the ratio of fiber length to the wire distance of each screen. Experimental results of penetration rates of glass fiber aerosol showed good agreement with the simulated results.
    Length distributions of outlet fibrous aerosol through the wire mesh screens were also calculated using the penetration rate and length distributions of inlet fibrous aerosol. Longer fibers were eliminated by the wire mesh screens, and the geometric standard deviation of length distribution decreased after passing through the screen.
    Finally, a new method for measuring the median fiber length was presented. If lognormal distribution is assumed for fiber length and the total penetration rates of the fibrous aerosol are measured for a few kinds of wire mesh screens, one can graphically obtain the median fiber length of fibrous aerosol using Fig. 5.
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  • The Effect of Wet Ball Milling in the Production Process of YBaCu Composite Oxide on its Superconducting Properties
    Toyokazu YOKOYAMA, Yoshifumi YOSHIDA, Akira KONDO, Makio NAITO, Masahi ...
    1991 Volume 28 Issue 8 Pages 501-507
    Published: August 10, 1991
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.28.501
    JOURNAL FREE ACCESS
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    The effects of wet milling of YBaCu oxide in ethanol and in n-hexane with a vibration ball mill on the superconducting properties of calcined powders and sintered pellets have been examined with a focus on first-stage milling before calcination in the preparation process. As a result, it was found that there is an optimum range of milling time in both cases.
    In the wet milling in n-hexane, it was confirmed that the prolonged milling causes agglomeration of particles as in dry grinding, which is considered to be one of the reasons for the degradation of the superconductivity of calcined powder.
    On the other hand, the elementary analysis by EPMA of the treated powder by wet milling in ethanol showed that the change in degree of mixing of each element agreed well with the tendency of variation in the superconducting props of the calcined powder and sintered pellet.
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  • Cluster-Moving Monte Carlo Algorithm
    Availability for Colloidal Dispersions
    Akira SATOH
    1991 Volume 28 Issue 8 Pages 508-513
    Published: August 10, 1991
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.28.508
    JOURNAL FREE ACCESS
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    We present a new Monte Carlo simulation procedure which is capable of capturing aggregate structures in a suspension where fine particles are dispersed. The algorithm we call the “cluster-moving” Monte Carlo algorithm involves moving aggregated (clusters) as unitary particles at every certain Monte Carlo step. Computer simulations have been carried out to investigate the availability of the algorithm for colloidal dispersions. The results of simulations have shown that the new algorithm produces much more rapid convergence than the conventional one and reproduces the physically reasonable aggregate structures of fine particles.
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  • Critical Velocity of Air-Solid Two-Phase Flow in Vertical Pipe
    Further Consideration about the Data of J. Flatow
    Yoshinobu MORIKAWA, Naohiro SUGITA
    1991 Volume 28 Issue 8 Pages 514-516
    Published: August 10, 1991
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.28.514
    JOURNAL FREE ACCESS
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