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Volume 32, Issue 10
Displaying 1-7 of 7 articles from this issue
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The Effects of Shearing and Diffusive MixingKunio SHINOHARA, Sachiko SUWA1995 Volume 32 Issue 10 Pages 706-712
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe mixing simulation of a binary powder mixture was carried out in order to design a new type of continuous powder mixer by applying fluctuating air. Shearing and diffusive mixing effects were added to our convective mixing mechanism proposed before by introducing coefficients of particle exchange and diffusion, respectively.
The mixing degree of the mixed layer was calculated according to those mixing coefficients, the operating conditions, and the dimensions of the mixer. It was found that the mixing degree increases with the horizontal transporting distance and the residence time of the particles descending in the mixer. As a result, the mixing mechanism of the designed mixer was described analytically, and proper conditions could be chosen to control the mixing degree.View full abstractDownload PDF (2995K) -
Hidetoshi MORI, Norio KIMURA1995 Volume 32 Issue 10 Pages 713-721
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe present paper deals with the initial collection efficiency of granular bed filters in a high-velocity region where inertial effects are significant. A filtration model is developed to predict the single-sphere collection efficiency resulting from combined inertial impaction and direct interception. The predictions are based on trajectory calculations of aerosol particles inside the cell of a Kuwabara-Happel flow model for multiple spheres. The collection efficiency predicted from the trajectory analysis is found to be much lower than that observed in the high-velocity region because of the complexity of the flow field within the granular media. An empirical expression of the single-sphere collection efficiency applicable in a wide range of the ratio of the inertial to interception parameter Ψ/NR=0.5-80 was also obtained. The expression derived from the experimental result is that the increment of the collection efficiency due to the inertial effects from the minimal value is correlated with the inertial and interception parameters.View full abstractDownload PDF (1076K) -
Keizo INABA, Kanji MATSUMOTO1995 Volume 32 Issue 10 Pages 722-730
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThere are many types of particle size analyzers, but the size of the measured particle varies depending on the analyzer used. In this study, the effects of particle shape on the results of various particle size data were examined for three types of particle size analyzers, i. e. an optical microscope, a Coulter counter and the laser diffraction method. In a Coulter counter, mean particle size from spherical, blocky and cubical particles agreed when using the microscopic method, but prismoidal and platy particles measured smaller with that method. When the laser diffraction method was used the mean particle size from spherical, blocky and platy particles agreed with the results of the microscopic method, but cubical particles measured larger and prismoidal particles measured smaller.
Because of this, a technique was proposed for estimating the mean particle size using an optical microscope from mean particle size obtained a Coulter conter or the laser diffraction method. This technique can be used to compare the measured mean particle size using a Coulter counter in combination with a laser diffraction method without the influence of particle shape.View full abstractDownload PDF (3659K) -
The Examination of the Evaluation Method for Dispensing of a Fine GranuleKenji KAWANO, Moriyuki OHKUMA, Kazuyoshi NAKAZAWA, Shoji TAKAMATSU, Ke ...1995 Volume 32 Issue 10 Pages 731-737
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSFormulations were established to evaluate the dispensing characteristics of fine granules.
The formulations were prepared mainly according to “the Standard Formula for Fine Granules” established by the Particulate Preparation and Designing Group of the Society of Powder Technology of Japan. Granulation was performed either by agitating granulation, fluidized-bed granulation or extrusion granulation. The dispensing characteristics were comprehensively assessed on the basis of “average weight”, “coefficient of variation”, “weight loss”, and “time for dividing”, as well as “operativeness” based on a sensory test by pharmacists.
As the results, it was observed that the dispensing characteristics of fine granules might greatly depend on the granulation method, the amount of binders, the size of bulk materials and the shape of the fine granules. In was also observed that content uniformity of a fine granule, i. e., relationship between its particle size and content, was closely related to the granulation procedure employed.View full abstractDownload PDF (2298K) -
Takenari TAKESHITA, Kunio ATSUMI, Yoshiyuki TANIGAWA1995 Volume 32 Issue 10 Pages 738-741
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (1930K) -
Otto Molerus, [in Japanese]1995 Volume 32 Issue 10 Pages 742-750
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (15420K) -
Tadashi FUYUKI1995 Volume 32 Issue 10 Pages 759-761
Published: 1995
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (1712K)
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