Journal of the Society of Powder Technology, Japan

[title in Japanese]

Kanji MATSUMOTO

2000 Volume 37 Issue 3 Pages 159
Published: March 10, 2000
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.37.159

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Entrained Air Flow Characteristics due to the Powder Jet

Koichiro OGATA, Katsuya FUNATSU, Yuji TOMITA

2000 Volume 37 Issue 3 Pages 160-167
Published: March 10, 2000
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.37.160

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In this research, we experimentally and numerically examine the flow characteristics of entrained air and powder jet. A phase- Doppler anemometer is used for the measurement of axial velocity of entrained air and particle. It is found that the axial velocity profiles of the entrained air shows the maximum value at the center-line and decreases toward outer edge. The flow region of entrained air spreads into a particle free space. The center-line velocity of entrained air increases with increasing distance from the orifice and decreases after it takes the maximum value. The spread of the entrained air is very small compared with that of the single-phase turbulent jet. The numerical simulation is performed based on the Lagrangian modeling for particles and Eulerian modeling for air flow. We consider particle-particle collision, drag force, gravity force and transverse force due to the particle spin and to the velocity gradient of air flow, and apply a k-ε model. The present simulation qualitatively explains our measurement in terms of particle and air velocity profiles and jet spreading.

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Particle Velocity and Concentration Profiles in Freeboard of Gas-solid Fluidized Bed and Proposal of a New Elutriation Model with Particle Collision

Hiroyuki KAGE, Hidekazu OGAWA, Takaya KUWAMOTO, Takuya SHIGEHIRO, Hiro ...

2000 Volume 37 Issue 3 Pages 168-175
Published: March 10, 2000
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.37.168

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In our previous investigation on the elutriation from a gas-solid fluidized bed, we found a very interesting phenomenon that the ratio of elutriation rate to particle concentration in the bed gradually decreased with the increase in particle concentration. A new model, which accounts for the obstructive effect on elutriation due to collisions between particles ascending in the core and those descending in the annulus at the boundary of these two regions, is proposed in order to explain this obstructive effect and the interaction between particle behavior in the freeboard and the particle elutriation. Particle velocity and concentration profiles in the freeboard are measured by optical fiber probes, as well as the elutriation rate at the top of fluidized bed. These experimental results are successfully explained by the proposed model.

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Effects of Grinding Condition on Synthesis of Forsterite

Mitsuru NIKAIDO, Shigeru SANO, Fumio SAITO

2000 Volume 37 Issue 3 Pages 176-182
Published: March 10, 2000
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.37.176

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Grinding a powder mixture of talc and MgCO₃ was conducted under dry (in air) and wet (with water) conditions to investigate the effects of these conditions on the formation of forsterite in sintered bodies from the ground products.
Dry grinding caused size reduction in the initial stage, followed by the aggregation of fine particles due to mechanical activation. This operation produced homogeneous mixture with structural change into amorphous state. The homogeneous mixture leads to acceleration of solid state reaction on its firing. On the contrary, wet grinding reduced the particle size in the mixture, but the crystal structure was maintained even in a prolonged grinding period. This is the main reason that different phases of forsterite are formed in the sintered bodies. Consequently, dry grinding is more advantageous than wet grinding in terms of forsterite formation in a body sintered at relative low temperatures.

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The Method of Evaluation and Control of the Dustiness and the Dispersibility of Cement in Air

Eiichi ONUMA

2000 Volume 37 Issue 3 Pages 183-189
Published: March 10, 2000
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.37.183

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[title in Japanese]

[in Japanese]

2000 Volume 37 Issue 3 Pages 190-200
Published: March 10, 2000
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.37.190

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[title in Japanese]

2000 Volume 37 Issue 3 Pages 202-204
Published: March 10, 2000
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.37.202

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[title in Japanese]

Akinobu OTSUKA

2000 Volume 37 Issue 3 Pages 205-209
Published: March 10, 2000
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.37.205

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[title in Japanese]

Masanobu AWANO

2000 Volume 37 Issue 3 Pages 210-216
Published: March 10, 2000
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.37.210

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[title in Japanese]

Syusahu HAKADA

2000 Volume 37 Issue 3 Pages 217-218
Published: March 10, 2000
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.37.217

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[title in Japanese]

Toyokazu YOKOYAMA

2000 Volume 37 Issue 3 Pages 219-221
Published: March 10, 2000
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.37.219

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