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Volume 30, Issue 7
Displaying 1-8 of 8 articles from this issue
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Toshihiro ISHIMORI, Mamoru SENNA1993 Volume 30 Issue 7 Pages 470-476
Published: July 10, 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe disintegration behavior of model granules of silica microspheres was characterized by two methods, i. e. by a shear method on a granular bed, and by a compression test on a single granule. The microstructure of granules was evaluated by mercury porosimetry together with scanning, as well as by transmission electron microscopy. The correlation between the two mechanical strengths was dominated by the difference in the microstructure, particularly by the lack of the homogeniety of the granule. The analyses result in a guideline for independently controlling the strength and density of granules.View full abstractDownload PDF (3995K) -
Mitsushi FUTAMURA1993 Volume 30 Issue 7 Pages 477-482
Published: July 10, 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe pneumatic conveyance tests of PVC and PTA powders which have fairly good fluidities, were carried out by making use of a practical scale line 25A pipe approximately 40m long.
The variation of the pressure in the tank and pipes, the flow pattern and conveyance efficiency were studied in a wide range of air velocity of about 1-20m/s.
The conveyance flow patterns were classified into three regions: suspension, plug conveyance and dune conveyance in the unstable and transition state.
The conveyance efficiency showed the peak value in the plug conveyance with the intermediate height of the settled layer at an average air velocilty of 2-3m/s.View full abstractDownload PDF (740K) -
Yoji NAKAJIMA, Satoru FURUSAWA, Hua LIANG, Tatsuo TANAKA1993 Volume 30 Issue 7 Pages 483-489
Published: July 10, 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe effect of aeration on the thermal stability of self-heating powder beds is mathematically discussed. Judging from the steady thermal characteristics of powder beds, aeration greatly improves the thermal stability. However, a consideration on the dynamic characteristics reveals that aeration without careful attention to the temperature distribution in the powder bed can make the thermal stability into a very critical situation.
To avoid the possible risk of a thermal catastrophe, the restorable limit of the temperature distribution for a given aeration condition is proposed, below which the thermal stability is ensured. Aeration should be controlled so that the temperature at any position in the powder bed is always below the restorable distribution.View full abstractDownload PDF (857K) -
Tadashi FUYUKI, Yukiyoshi YAMADA, Koichi IINOYA1993 Volume 30 Issue 7 Pages 490-495
Published: July 10, 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSFree vortex cyclones are used in various industrial fields because of their simple structure, low equipment investment, easy maintenance and low running cost. Recent studies have improved their performances. A broad range of applications of free vortex cyclones are expected for industrial and especially high temparature dust collections. However, there are still many phenomena that need to be made clearly.
In this study, the performances of free vortex cyclones as dust collectors have been experimentally studied under various operating conditions using several types of cyclones and with several kinds of wall surface roughness. It was found that the addition of a little friction resistance to a cyclone's cylindrical wall is desirable to reduce pressure loss without reducing collection efficiency. On the other hand, a special type of cyclone is capable of better performance than that of the normal type. Its pressure loss is lower, and its collection efficiency is slightly higher than the normal type. A cylindrical type has a performace similar to a normal one, but a conical type is inferior. A slightly eccentric exit pipe does not have much effect on the cyclone's performance.View full abstractDownload PDF (558K) -
Toshio OSHIMA, You-lin ZHANG, Mitsuaki HIROTA, Michitaka SUZUKI, Takes ...1993 Volume 30 Issue 7 Pages 496-501
Published: July 10, 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIt is empirically known that the flowability of ground powders varies with the types of mill. In this study, five kinds of test powders of the same size made from the same raw material were prepared by five different types of mills and classifiers. The flowability of these powders were measured, and the difference between each result identified. Then, the relationship between the flowability of the powder and particle shape was investigated. The circularity, Wadell's working sphericity, the fractal dimension of particle perimeters and the specific surface area ratio of the test powders were measured, and the effect of the particle shape on the flowability index was studied. The result was that the particle shape, especially the surface roughness of particles, had a very great effect on the flowability of the powders due to the type of mill.View full abstractDownload PDF (2082K) -
Minoru SUGITA1993 Volume 30 Issue 7 Pages 502-506
Published: July 10, 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (600K) -
Mitsuyuki NAKAJIMA1993 Volume 30 Issue 7 Pages 514-521
Published: July 10, 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (2738K) -
Toshihiko MYOJO1993 Volume 30 Issue 7 Pages 522-524
Published: July 10, 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (2030K)
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