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Volume 19, Issue 12
Displaying 1-15 of 15 articles from this issue
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Yoshinobu MORIKAWA1982 Volume 19 Issue 12 Pages 692
Published: December 10, 1982
Released on J-STAGE: April 30, 2010
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Yoshinobu MORIKAWA1982 Volume 19 Issue 12 Pages 693-698
Published: December 10, 1982
Released on J-STAGE: April 30, 2010
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Ken-ichi YOSHIE, Akira SUGANUMA, Hideo YAMAMOTO, Ryuichi AOKI1982 Volume 19 Issue 12 Pages 699-703
Published: December 10, 1982
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis paper describes of a method for the design and analysis of a pneumatic classifier by flow visualization, using a magnified model.
For the design and analysis of a pneumatic classifier, it is neccessary to know the flow field. Flow visualization by small mist tracer is an easy way to know a flow field.
If tracer particles are thrown into the actual classifier, particles deviate from the stream by inertia force. So it is not possible to look at the real flow.
However, using a sufficiently magnified model, tracer particles do not deviate from the flow. It then becomes possible to investigate the real flow.
A model, 10 times larger than the virtual-Impactor type classifier was made. And using the results of the flow visualisation, the shape of the wake was determined.
It is assumed that the wake is a rigid body, and the main flow is the potential flow. By the S. O. R. method, it is possible to calculate the flow field. By solving one particle's dynamic equation, it is possible to obtaine the trajectory of the particles of each diameter and the partial classification efficiency. These calculated results are in approximate agreement with the experimental results.
Afterwards, using the magnified model, a search for the shape of a classifier which has good characteristics is undertaken. One example of a classifier which was searched for is shown.View full abstractDownload PDF (3118K) -
Toshio OSHIMA, Mitsuaki HIROTA, Hiroyuki MORISHITA, Kenji ARIMOTO1982 Volume 19 Issue 12 Pages 703-708
Published: December 10, 1982
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe behavior of dust particles depositing on a circular obstacle setting in a turbulent dusty gas flow was observed. On various conditions of gas velocity and temperature, a change of shape with time, final equilibrium shape and void fraction on the dust pile of three kinds of powder were measured. It is shown that the weight of deposited particles under final equilibrium conditions are not correlated with a particle kinetic energy but are correlated with the ratio of kinetic energy to adhesion force per unit particle. It is promising that the adhesion probability at the beginning of deposition may also be correlated with the same ratio. Consequently, in the consideration about particle deposition and repulsion, it is clear that mechanical properties of powder are important along with particle kinetic energy.View full abstractDownload PDF (1981K) -
Shigeki TOYAMA, Hidetoshi MORI, Akira YAMAGUCHI1982 Volume 19 Issue 12 Pages 709-713
Published: December 10, 1982
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSTo elucidate the effects of particulate fouling on performance of heat exchangers, the mechanism of particle deposition onto a cylinder in turbulent gas flow was experimentally investigated by changing the flow conditions with the dust (fly ash) for industrial testing No. 5, JIS Z 8901 (1974).
Particles were apt to deposit near the stagnant point and beyond the separation points of the cylinder, and they were affected by Reynolds number and the turbulent intensity. The cumulative number-size distributions of particles were measured by a Lasor Granulometer, and deposited particles at the stagnant points were found to be coarser than those of deposited at the wake zone.View full abstractDownload PDF (504K) -
Kikaku IKEMORI, Mitsuaki OCHI, Hiroshi IKEMORI1982 Volume 19 Issue 12 Pages 714-718
Published: December 10, 1982
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn the pneumatic transport of coarse particles, such as wheat grains and polyethylene pellets by a horizontal pipeline, the distributions of particle concentration in the vertical plane as well as in the horizontal were detected by taking pictures of flowing particles using a strobo-camera in the region of established flow at different conditions. On the other hand, the air velocity distributions in the solid-gas two-phase flow were also measured by a small Pitot tube.
Based on the specific settling velocity of a particle in the turbulent shear flow of the Couette type, a theoretical equation for the vertical distribution of solids in steady-state was derived from the state of equilibrium between the upward rate of particle diffusion due to their collision and the downward mass rate of particle transfer per unit area due to gavity in the field. The upward particle diffusion was thought to be attributed to particle-to-particle collision as well as to particle-to-wall impact.
Using the model equation that the authors derived, the experimental data were analyzed, and reasonable equation for the vertical distribution of particle concentration shown in Figure 4 was obtained. Favourable agreement was found between expermental data and the equation when the solids-gas flow ratio is larger than 2, which means that the turbulence in the pipe was presumably largely controlled by the solids.View full abstractDownload PDF (601K) -
Kazunobu KODAMA, Nobuhiko FUKUSHMA1982 Volume 19 Issue 12 Pages 719-721
Published: December 10, 1982
Released on J-STAGE: April 30, 2010
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Yutaka TSUJI, Yoshinobu MORIKAWA1982 Volume 19 Issue 12 Pages 722-726
Published: December 10, 1982
Released on J-STAGE: April 30, 2010
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Kenji HASHIMOTO1982 Volume 19 Issue 12 Pages 726-731
Published: December 10, 1982
Released on J-STAGE: April 30, 2010
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Takashi MORIYAMA1982 Volume 19 Issue 12 Pages 731-735
Published: December 10, 1982
Released on J-STAGE: April 30, 2010
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Sadao SAKAMOTO1982 Volume 19 Issue 12 Pages 735-739
Published: December 10, 1982
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSTo study the phenomenon of particle dispersion in the air flow in a pipe, the particle flux distribution using variously shaped particles were measured. The following results are obtained: 1) The dispersion coefficient of the particles in the first turbulent diffusion zone, is 0.5-1.3 times of that of the air flow. 2) The disperion coefficient of the particles in the second turbulent diffusion zone, is (1.9-8.6)×10-4m2/s when the mean air velocity is 4-18m/s. 3) As the particle size becomes larger the dispersion coefficient of the spherical particles decreases. But if irregularly shaped particles are used, the dispersion coefficient of the particles. does not always decrease. 4) The delay time of dispersion is known in the empirical formula of the function of dk/UView full abstractDownload PDF (531K) -
1982 Volume 19 Issue 12 Pages 751-753
Published: December 10, 1982
Released on J-STAGE: April 30, 2010
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[in Japanese]1982 Volume 19 Issue 12 Pages 754-767
Published: December 10, 1982
Released on J-STAGE: April 30, 2010
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1982 Volume 19 Issue 12 Pages 767
Published: December 10, 1982
Released on J-STAGE: April 30, 2010
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1982 Volume 19 Issue 12 Pages 768
Published: December 10, 1982
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (168K)
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