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Volume 18, Issue 9
Displaying 1-11 of 11 articles from this issue
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Masuo HOSOKAWA1981 Volume 18 Issue 9 Pages 656
Published: September 10, 1981
Released on J-STAGE: April 30, 2010
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Keijiro TERASHITA, Kei MIYANAMI, Masashi OKAJIMA, Kazuo FURUBAYASHI1981 Volume 18 Issue 9 Pages 657-665
Published: September 10, 1981
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe normal stress and its distribution for several kinds of solid powders with various amonnts of water in the vicinity of the shearing plain have been measured both by a constant volume shear tester and a constant vertical load tester. The yield loci have been calculated from the measured actual normal stress data. The tensile test of wet powders has been also made.
The distribution of normal stresses in the vicinity of the shearing plane is the narromest for dry powders and becomes wider with change from the funicular and capillary to the mixed zone. The internal friction factor decreases with increase in the water contest of the powders in the pendular zone, while it is almost constant for funicular, capillary and the mixed zones, The internal friction factor calculated from the actal normal stress measured by the constant vertical load tester is agrees well with that obtained by the constant volume tester. Cohesion in the pendular zone increases remarkably with increasing water contest in the powders, gradually increases in the funicular zone, and is almost constant in the funicular-and-capillary mixed zone. It is also found that the cohesion coincides well with the tensile strength. Flowability of wet powders is less enhanced as the cohesion or tensile strength becomes larger.View full abstractDownload PDF (1067K) -
Hisakazu SUNADA, Akinobn OTSUKA, Yoshiaki KAWASRIMA, Hideo TAKENAKA1981 Volume 18 Issue 9 Pages 666-670
Published: September 10, 1981
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSMonte Carlo simulation of agglomeration in liquid suspension was made by a two-dimensional random walk model. Initially, arbitrary numbers of uniform discs, the diameter of which was unity, were randomly dispersed on a plane. Subsequently, each particle was moved in one direction of the six, which was determined by a pseudo-random number generated by a computer. When a moving particle came in contact with another particle, a pseudo-random number was generated again, which was compared with the probability coefficient of aggregation (P) to determine whether aggregation could occur or not. Such a procedure was taken on each particle and the new locations of these were determined, After that, the number of agglomerates present in the plane was calculated. The decrease in number of agglomerates during the process agreed with the second order rate equation. Change in shape, bulkiness and anisometry of agglomerates with time were also examined.View full abstractDownload PDF (519K) -
1981 Volume 18 Issue 9 Pages 671
Published: September 10, 1981
Released on J-STAGE: April 30, 2010
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Case of air injection from the upper side of the binTakenari TAKESHITA, Takeshi KANO, Hajime WATANABE, Hideaki FURUI, Koji ...1981 Volume 18 Issue 9 Pages 672-677
Published: September 10, 1981
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe flow of granular materials in silos, hoppers and some other containers has been handled smoothly by injecting air into them. Although various studies have been reported thus far, the satisfactory explanation of the mechanism of the flow has not yet been given.
In this study, for the purpose of carrying out a fundamental study of the flow characteristics of granular materials, air was injected from the upper side of a two-dimensional bin and the effect of the flow rate of the injected air on the flows of sands and glass beads was investigated.
Consequently, the relationship between the flow rate of air, the pressure distribution of air in the bin and the discharge rate of granular materials were examined and an experimental correlation based on the fundamental theory was obtained.View full abstractDownload PDF (572K) -
Mitsuaki HIROTA, Toshio OSHIMA, Yasuhiro SUGIHARA1981 Volume 18 Issue 9 Pages 678-680
Published: September 10, 1981
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to describe the failure properties of compressive cohesive powders, the yield locus must be known. In general, shear tests are carried out to determine the yield locus. But in most papers, the compressive stresses in the shear tests are limited to positive regions. In this paper, shear tests were performed for various compressive stresses from positive to negative. The results showed that the yield locus for the positive compressive stresses is straight, but in the negative regions, that is the tensile stress regions, the yield locus curves and tangent at σ0 to the Mohrs' circle go through the origin and σ0.View full abstractDownload PDF (348K) -
Kiyoshi TAKAHASHI, Shigeaki YOKOYAMA, Hisashi OHTA, Humio FUJIHIRA, Na ...1981 Volume 18 Issue 9 Pages 681-687
Published: September 10, 1981
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to develop a stand-alone type automatic rheometer which can process data, a microcomputer is introduced to a conventional rheometer with coaxially revolving cylinders. Normally, the viscosity of fluid depends very much on temperature. By this equipment, it becomes easy to hold a test specimen and to set it at any desired temperature. The measurement can be carried out readily by a dialogue with the microcomputer through the console. From the measurement of flow characteristics for various specimens, e. g. various kinds of slurry, paste, etc. using this equipment, it was confirmed that the introduction of a microcomputer was effective.View full abstractDownload PDF (1864K) -
Naoaki OISHI, Toshiaki SAKAIDA, Mitsuru HASEGAWA1981 Volume 18 Issue 9 Pages 688-695
Published: September 10, 1981
Released on J-STAGE: April 30, 2010
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Yoshinobu MORIKAWA1981 Volume 18 Issue 9 Pages 696-697
Published: September 10, 1981
Released on J-STAGE: April 30, 2010
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Yasuhiko UEHARA1981 Volume 18 Issue 9 Pages 698-699
Published: September 10, 1981
Released on J-STAGE: April 30, 2010
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Chikao KANAOKA1981 Volume 18 Issue 9 Pages 700-702
Published: September 10, 1981
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (3760K)
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