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Volume 33, Issue 4
Displaying 1-8 of 8 articles from this issue
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Zennosuke TANAKA, Masahiko UCHIYAMA1996 Volume 33 Issue 4 Pages 248-252
Published: April 10, 1996
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSMulti-stage fluidized classification was applied to do accurate air classification. As a result of a comparison with screening, the feed particles can be fractionated by screening into six gradational products. The performance of the classifier is much greater than the screening. This is a very low cost method of air classification. The required amount of air is about twice as much as the feed. This method is also effective in the dry classification of abrasive particles.View full abstractDownload PDF (459K) -
The Forms of the Rotor Blades System and Pressure Loss within a Cage-type Centrifugal Air ClassifierMitsuhiro ITO, Yoshihiko MIYABE, Fumio KAWANO1996 Volume 33 Issue 4 Pages 253-261
Published: April 10, 1996
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSNumerical and experimental studies were conducted on a way to decrease the pressure loss through a cage-type centrifugal air classifier, without decreasing the classification efficiency and increasing the size of cut.
Most of the pressure loss is produced on the inside of the rotor. To decrease such a pressure loss, a cage-type rotor equipping new blades inside of the conventional blades is most desirable in the sphere of this study. A cage-type rotor equipped with inclined blades is also more desirable than the conventional one.View full abstractDownload PDF (967K) -
Zennosuke TANAKA, Xuqi SONG1996 Volume 33 Issue 4 Pages 262-265
Published: April 10, 1996
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSParticle size is classified by screening and fluid in a dry and wet system. This separation approach is based on the extraction of the molecular system and can be taken into a particle system as an energy saving process. In this process, the particles of two components are mixable or nonmixable depending on particle size ratios and the density ratio. The air velocity that is applied here is the minimum fluidization velocity making the cost of power consumption economical. Therefore, this separation process can be applied for less expensive materials.
In this study, axial pressure distributions in a fixed bed and a fluidized bed are measured. Comparisons of the experimental and the theoretical results of the fractional distribution of coarse particles are discussed. The separation grade can be determined from the pressure difference.View full abstractDownload PDF (359K) -
Kazuo URA, Hisakazu SHINDO1996 Volume 33 Issue 4 Pages 266-272
Published: April 10, 1996
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA mixing index based on contact numbers by coordination number sampling was proposed by Akao et al. The contact number is defined as the number of particles which are in contact with a particular particle called a specified particle. Statistically, the contact number mixing index is on the basis of the first moment, mean, in contrast to variance-based indexes such as Lacey's.
Shindo reported the distribution of contact numbers from a binary mixture in an incompletely mixed state. The distribution was derived from a beta-binomial distribution as a conditional one.
This paper extends the distribution of contact numbers for a binary case to that for a multicomponent case. The precison of estimation of the mixing index is theoretically derived and compared with that of reduced binary case. It can be concluded that the best precision is obtained if we select the particles whose population concentration is lowest as specified particles. This conclusion holds whatever the number of components is.View full abstractDownload PDF (726K) -
Makoto KOHGA, Yutaka HAGIHARA1996 Volume 33 Issue 4 Pages 273-278
Published: April 10, 1996
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn general, a decrease in the particle size or an increase in the specific surface area of Ammonium Perchlorate (AP) results in an increase in the burning rate of AP composite propellant. Recently, it has become necessary to manufacture a propellant with a higher burning rate. In order to attain this requirement, fine porous AP is one of the possible candidates.
In the present work, an attempt was made to prepare fine porous AP by the spray-drying method. Consequently, fine porous AP was prepared. The mean diameter of these particles is 3.5μm, and their specific surface area is 2.12×103m2/kg. It is proved that the spray-drying method is available for the preparation of fine porous AP.View full abstractDownload PDF (3262K) -
Jun YOSHIDA1996 Volume 33 Issue 4 Pages 279-286
Published: April 10, 1996
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESS‘Granular convection’ is a well-known phenomenon when particles in a bin are vertically vibrated. However, its actual mechanical movement is not fully understood. An experiment using the magnetic resonance image (MRI) by Ehrichs et al, clearly reveals the behavior of particles. In this study, the experiment is simulated using a 3-dimensional distinct element code. The analytical result, shown as a central section of the particle layers, is identical to the experimental one. A comparison between 0-4 cycles and 100-104 cycles reveals a similar behavior. This demonstrates that convection occurs as a repetition of 1 cycle. Detailed analysis reveals the behavior of the individual particles during convection. The driving force of the convection appears to be the different movement of the inner and outer particles. This mechanism which was proposed by Taguchi is proved by this analysis.View full abstractDownload PDF (6769K) -
Toshitsugu TANAKA1996 Volume 33 Issue 4 Pages 307-309
Published: April 10, 1996
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (313K) -
[in Japanese]1996 Volume 33 Issue 4 Pages 310-313
Published: April 10, 1996
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (474K)
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