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24 巻, 11 号
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粒子の軌跡計算佐藤 勇一, 山田 幸良1987 年 24 巻 11 号 p. 693-699
発行日: 1987/11/10
公開日: 2010/04/30
ジャーナル フリーTrajectories of particles thrown into a forced vortex type centrifugal air classifier are presented to clarify the causes of classification error. The cascade flow is calculated with a finite element method applied to the potential equation. The analysis of particle trajectories rests on the assumption of low volumetric solid/gas ratios so that the flow field is not appreciably disturbed. The obtained results show that a trajectory is affected significantly by the position of the collisions with the blade-walls. A particle thrown in a classifier with a narrow blade interval generally moves outside of a cascade and travels a very long distance before it is classified.抄録全体を表示PDF形式でダウンロード (1886K) -
安井 英夫, 岡田 渉, 三木 康弘, 森川 久1987 年 24 巻 11 号 p. 700-706
発行日: 1987/11/10
公開日: 2010/04/30
ジャーナル フリーA new coagulation method which consists of two stages the generation of seed particles and the growth of particles, was developed for the preparation of pellet-like particles from polymer latex.
In this report, first the mechanism of this coagulation was studied through an examination of the coagulating velocity during each stage. Then the pellet-like particles were characterized by a SEM observation of the inside of a particle and a measurement of particle properties.
As a result, experimental equations on the amount of generated seed particles and rate of growth of the particles were obtained. The phenomena in which the latex particles inside the coagulated particle are packed closely by drying and are fused homogeneously by sintering, was confirmed.抄録全体を表示PDF形式でダウンロード (4794K) -
粒径差による分離現象と循環時間比佐藤 宗武, 出口 雄一郎, 津村 元, 宮南 啓1987 年 24 巻 11 号 p. 707-712
発行日: 1987/11/10
公開日: 2010/04/30
ジャーナル フリーTo investigate the characteristics of the flow and the mixing and/or demixing of particles in the powder mixer, the relationship between the circulating time and the particle size for the cases of various combinations of binary components has been measured by using an optical method. A mechanical agitation type of mixer with a vibrating vessel has been employed, and six pairs of optical fiber made of plastics were inserted in the particle bed as a detector of the tracer concentration. The particle bed in the vessel during the mixing operation showed a fluid-like behavior in the limited region of the operating conditions, both for the impeller speed and frequency of vessel vibration. The larger particles in the smaller particle bed showed a smaller circulating time. On the other hand, the circulating time for the smaller particles in the larger particle bed showed the opposite tendency. A new parameter Θ defined as the ratio of the circulating time θ(NR) for the tracer particles at impeller speed NR and θO(NR) for the bulk particles at the same operating conditions has been introduced as an index of the segregating or demixing tendencies due to the difference in the particle size. The effects of the size ratio of the tracer and bulk particles, dPB/dPA and the size of bulk particles bed on the parameter Θ have been examined.抄録全体を表示PDF形式でダウンロード (746K) -
セル重量の影響の検討高井 陸雄, 乾 和也, 村田 博, 青木 隆一1987 年 24 巻 11 号 p. 713-719
発行日: 1987/11/10
公開日: 2010/04/30
ジャーナル フリーTo determine the wall friction coefficients of powders, the traditonal inclined plate method is simple, and its powder bed works actively in the test. However, in this method, the weight of the test cell must be negligibly small. In this report, we proposed a new method and a test apparatus which had two inclined plates with the same base angles. During measurement, the weight of the test cell could be cancelled by the dummy weight which was connected with the test cell by a string and placed on one of the plates. The wall friction coefficients of Sohma sand, wheat flour and corn starch, which were determined by the traditional method (the single-cell method) using heavier cells, decreased with the increasing weight of test cell. On the other hand, the wall friction coefficients of those powders determined by the new method (counter balance method) show the constant values for each powder.抄録全体を表示PDF形式でダウンロード (805K) -
森山 峻1987 年 24 巻 11 号 p. 733-735
発行日: 1987/11/10
公開日: 2010/04/30
ジャーナル フリーPDF形式でダウンロード (361K) -
田中 善之助1987 年 24 巻 11 号 p. 736-739
発行日: 1987/11/10
公開日: 2010/04/30
ジャーナル フリーPDF形式でダウンロード (5428K)
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